Bibliography

Frisbee SJ, Brooks AP, Maher A, et al (2009). The C8 Health Project: Design, Methods, and Participants. Environmental Health Perspectives.

The C8 project provides unusually large-scale evidence about high PFOA exposure, but its numerical risks should not be applied directly to typical households.

Olsen GW, Chang SC, Noker PE, et al (2009). A Comparison of the Pharmacokinetics of Perfluorobutanesulfonate in Rats, Monkeys, and Humans. Toxicology.

PFBS serum clearance is measured in weeks in limited studies, while PFOA typically takes years. Neither result establishes safety.

Steenland K, Tinker S, Frisbee S, Ducatman A, Vaccarino V (2009). Association of Perfluorooctanoic Acid and Perfluorooctane Sulfonate with Serum Lipids Among Adults Living Near a Chemical Plant. American Journal of Epidemiology.

Higher PFOA and PFOS are consistently associated with modestly higher cholesterol, but the association alone does not prove cardiovascular disease.

Bartell SM, Calafat AM, Lyu C, Kato K, Ryan PB, Steenland K (2010). Rate of Decline in Serum PFOA Concentrations After Granular Activated Carbon Filtration at Two Public Water Systems in Ohio and West Virginia. Environmental Health Perspectives.

Stopping a major exposure source works, but existing serum PFOA falls over years rather than days.

Gallo V, Leonardi G, Genser B, et al (2012). Serum Perfluorooctanoate and Perfluorooctane Sulfonate Concentrations and Liver Function Biomarkers in a Population with Elevated PFOA Exposure. Environmental Health Perspectives.

Large human studies find higher ALT with higher PFOA or PFOS, but ALT is a biomarker and the studies do not prove chronic liver disease.

Grandjean P, Andersen EW, Budtz-Jørgensen E, et al (2012). Serum Vaccine Antibody Concentrations in Children Exposed to Perfluorinated Compounds. JAMA.

Higher childhood PFAS concentrations have been associated with lower antibody responses to some vaccines. The research does not show that exposed children inevitably lose vaccine protection.

Savitz DA, Stein CR, Bartell SM, et al (2012). Perfluorooctanoic Acid Exposure and Pregnancy Outcome in a Highly Exposed Community. Epidemiology.

The C8 pregnancy data suggest a small PFOA-preeclampsia association, not broad proof that PFOA causes every adverse pregnancy outcome.

Fitz-Simon N, Fletcher T, Luster MI, et al (2013). Reductions in Serum Lipids with a 4-Year Decline in Serum Perfluorooctanoic Acid and Perfluorooctanesulfonic Acid. Epidemiology.

Longitudinal evidence strengthens the cholesterol association, but no study has shown that household PFAS reduction prevents heart attacks or strokes.

Steenland K, Zhao L, Winquist A, Parks C (2013). Ulcerative Colitis and Perfluorooctanoic Acid in a Highly Exposed Population of Community Residents and Workers in the Mid-Ohio Valley. Environmental Health Perspectives.

High PFOA exposure was associated with ulcerative colitis in the C8 cohort, but the prospective evidence was much less precise.

Winquist A, Steenland K (2014). Perfluorooctanoic Acid Exposure and Thyroid Disease in Community and Worker Cohorts. Epidemiology.

High PFOA exposure was associated with thyroid disease in women in the C8 cohort. Results do not support claiming that every PFAS causes hypothyroidism.

Harris MH, Rifas-Shiman SL, Calafat AM, et al (2017). Predictors of Per- and Polyfluoroalkyl Substance Plasma Concentrations in 6-10 Year Old American Children. Environmental Science & Technology.

Some studies associate carpeted bedrooms or stain-resistant furnishings with higher PFAS, but they do not quantify the contribution from a particular current product.

Li Y, Fletcher T, Mucs D, et al (2018). Half-Lives of PFOS, PFHxS and PFOA After End of Exposure to Contaminated Drinking Water. Occupational and Environmental Medicine.

Some legacy PFAS take years to fall by half after a major source is removed. The exact rate varies considerably between people.

Steenland K, Barry V, Savitz D (2018). Serum Perfluorooctanoic Acid and Birthweight: An Updated Meta-analysis With Bias Analysis. Epidemiology.

PFOA may have a small effect on fetal growth, but the best evidence shows that late-pregnancy sampling can exaggerate the association.

Boronow KE, Brody JG, Schaider LA, Peaslee GF, Havas L, Cohn BA (2019). Serum Concentrations of PFASs and Exposure-Related Behaviors in African American and Non-Hispanic White Women. Journal of Exposure Science & Environmental Epidemiology.

Dental floss is a possible minor source based on one exploratory study. Nonstick-cookware use was not associated with PFOA body burden in that study.

Hu XC, Tokranov AK, Liddie J, et al (2019). Tap Water Contributions to Plasma Concentrations of Poly- and Perfluoroalkyl Substances in a Nationwide Prospective Cohort of U.S. Women. Environmental Health Perspectives.

Tap water may contribute modestly in many places and dominate in contaminated communities. The contribution cannot be inferred without local testing.

Susmann HP, Schaider LA, Rodgers KM, Rudel RA (2019). Dietary Habits Related to Food Packaging and Population Exposure to PFASs. Environmental Health Perspectives.

Older US data support food packaging as an exposure source, especially microwave-popcorn packaging, but current exposure should be lower following the US phaseout and has not yet been fully quantified.

Herkert NJ, Merrill J, Peters C, et al (2020). Assessing the Effectiveness of Point-of-Use Residential Drinking Water Filters for Perfluoroalkyl Substances. Environmental Science & Technology Letters.

Reverse osmosis was the most consistently effective home technology in this study. Carbon performance varied, especially for short-chain PFAS.

Xu Y, Fletcher T, Pineda D, et al (2020). Serum Half-Lives for Short- and Long-Chain Perfluoroalkyl Acids After Ceasing Exposure from Drinking Water Contaminated by Firefighting Foam. Environmental Health Perspectives.

Shorter-chain PFAS often leave serum faster, but ‘faster’ does not mean harmless or environmentally degradable.

Gao X, Ni W, Zhu S, et al (2021). Per- and Polyfluoroalkyl Substances Exposure During Pregnancy and Adverse Pregnancy and Birth Outcomes: A Systematic Review and Meta-Analysis. Environmental Research.

PFOS exposure may be associated with a modest increase in preeclampsia risk. Evidence for most other pregnancy outcomes remains limited or inconsistent.

Shearer JJ, Callahan CL, Calafat AM, et al (2021). Serum Concentrations of Per- and Polyfluoroalkyl Substances and Risk of Renal Cell Carcinoma. Journal of the National Cancer Institute.

Evidence for PFOA and kidney cancer is concerning but not uniform across cohorts. It supports a hazard concern, not a precise household-risk estimate.

Whitehead HD, Venier M, Wu Y, et al (2021). Fluorinated Compounds in North American Cosmetics. Environmental Science & Technology Letters.

Some cosmetics contain PFAS and laboratory skin models show possible absorption. Human uptake and health risk from normal use have not been quantified.

Costello E, Rock S, Stratakis N, et al (2022). Exposure to Per- and Polyfluoroalkyl Substances and Markers of Liver Injury: A Systematic Review and Meta-Analysis. Environmental Health Perspectives.

Higher PFOA, PFOS, and PFNA exposure is consistently associated with higher liver-enzyme biomarkers, but this does not by itself establish liver disease.

Gasiorowski R, Forbes MK, Silver G, et al (2022). Effect of Plasma and Blood Donations on Levels of Perfluoroalkyl and Polyfluoroalkyl Substances in Firefighters in Australia: A Randomized Clinical Trial. JAMA Network Open.

Donation can lower selected serum PFAS in eligible people, but it is not an established medical treatment and has not been shown to improve PFAS-related health outcomes.

Toptancı İ, Ketenoglu O, Kıralan M (2022). Assessment of the Migration of Perfluorinated Compounds and Primary Aromatic Amines from PTFE-Coated Non-Stick Cookware Marketed in Turkey. Environmental Science and Pollution Research.

Some cookware can release PFOA in laboratory tests, but evidence does not establish nonstick cookware as a major current US exposure source.

Crawford L, Halperin SA, Dzierlenga MW, et al (2023). Systematic Review and Meta-analysis of Epidemiologic Data on Vaccine Response in Relation to Exposure to Five Principal Perfluoroalkyl Substances. Environment International.

The combined evidence supports a modest association between PFOA, PFOS, or PFHxS exposure and lower vaccine-antibody concentrations, especially in children.

Goodman CV, Till C, Green R, et al (2023). Prenatal Exposure to Legacy PFAS and Neurodevelopment in Preschool-Aged Canadian Children: The MIREC Cohort. Neurotoxicology and Teratology.

Evidence for PFAS-related neurodevelopmental harm is inconsistent. It is not accurate to say that PFAS generally lowers every child’s IQ or causes ADHD or autism.

Purdue MP, Rhee J, Denic-Roberts H, et al (2023). A Nested Case-Control Study of Serum Per- and Polyfluoroalkyl Substances and Testicular Germ Cell Tumors Among U.S. Air Force Servicemen. Environmental Health Perspectives.

One military cohort found higher testicular-cancer odds with higher PFOS, but the estimate was imprecise and needs replication.

Rhee J, Chang VC, Cheng I, et al (2023). Serum Concentrations of Per- and Polyfluoroalkyl Substances and Risk of Renal Cell Carcinoma in the Multiethnic Cohort Study. Environment International.

Evidence for PFOA and kidney cancer is concerning but not uniform across cohorts. It supports a hazard concern, not a precise household-risk estimate.

Yao H, Fu Y, Weng X, et al (2023). The Association Between Prenatal Per- and Polyfluoroalkyl Substances Exposure and Neurobehavioral Problems in Offspring: A Meta-Analysis. International Journal of Environmental Research and Public Health.

Evidence for PFAS-related neurodevelopmental harm is inconsistent. It is not accurate to say that PFAS generally lowers every child’s IQ or causes ADHD or autism.

Zahm S, Bonde JP, Chiu WA, et al (2024). Carcinogenicity of Perfluorooctanoic Acid and Perfluorooctanesulfonic Acid. The Lancet Oncology.

IARC classifies PFOA as a human carcinogenic hazard and PFOS as a possible carcinogenic hazard. The categories do not state how much cancer risk results from a particular household exposure.

Lewis-Michl EL, Forand SP, Hsu WH, et al (2025). Perfluorooctanoic Acid Serum Concentrations and Half-Lives in a Community Exposed to Contaminated Drinking Water in New York State. Journal of Exposure Science & Environmental Epidemiology.

PFBS serum clearance is measured in weeks in limited studies, while PFOA typically takes years. Neither result establishes safety.

Li J, Cui Y, Zheng C, Zhang Y, Li S, Li L (2025). GenX Induces Offspring Vascular Endothelial Ferroptosis by Targeting GPX4 for Ubiquitination-Dependent Degradation. Current Research in Toxicology.

GenX is not proven safe. Animal studies show potential hazards, but they cannot be converted directly into disease risk from normal household exposure.

Raza YN, Moustafa JSE, Zhang X, et al (2025). Longitudinal Association of PFOA and PFOS Exposure with Lipid Traits. Journal of Exposure Science & Environmental Epidemiology.

A large twin study followed British adults for 18 years and found that higher relative PFOA and PFOS levels were linked to higher total and LDL cholesterol.

Wang Z, Yuan G, Sun M, et al (2025). Decorative Cosmetics and Skin Care Products Contribute Significantly to Short-Chain Perfluoroalkyl Carboxylates Exposure. Journal of Hazardous Materials.

Some cosmetics contain PFAS and laboratory skin models show possible absorption. Human uptake and health risk from normal use have not been quantified.

Zhang B, Zhao M, Cong X, et al (2025). The Association Between Per- and Polyfluoroalkyl Substances Exposure and Thyroid Hormones in Men and Non-Pregnant Women: A Systematic Review and Meta-Analysis. Toxics.

Human thyroid-hormone findings are mixed and generally small. Broad claims that PFAS causes hypothyroidism are not justified.

Zhang JJ, Chen YK, Chen YQ, et al (2025). Gestational GenX Exposure Induces Maternal Hepatotoxicity by Disrupting the Lipid and Bile Acid Metabolism Distinguished from PFOA-Induced Pyroptosis. Toxics.

GenX is not proven safe. Animal studies show potential hazards, but they cannot be converted directly into disease risk from normal household exposure.

Baek K (2026). Associations Between Physical Exercise and Serum PFAS Concentrations. International Journal of Environmental Health Research.

In almost 3,000 Korean adults, even intense sweat-inducing exercise was not linked to lower blood PFAS, arguing against sweating as a way to clear PFAS from the body.

Cathey A, Woodbury M, Varshavsky J, et al (2026). Association Between Gestational PFAS Exposure Biomarkers and Risk of Preeclampsia in the ECHO Cohort. Environmental Research.

Among more than 2,300 pregnancies, higher PFOA was linked to a modestly higher preeclampsia rate, but the estimate was imprecise and a stronger subgroup finding needs confirmation.

Hofmann JN, Tan Y, Barry V, et al (2026). Perfluorooctanoic Acid and Cancer Incidence: An Updated Investigation of a Cohort in the Mid-Ohio Valley. Environment International.

Extended C8 follow-up strengthens concern about kidney and testicular cancer at high PFOA exposure, but household-level risk cannot be calculated from this cohort.

Hollister J, Porter C, Xiang B, et al (2026). Association Between Perfluoroalkyl and Polyfluoroalkyl Substances and Response to the COVID-19 Vaccine in a Paediatric Prospective Observational Cohort in Arizona. BMJ Paediatrics Open.

A 2026 study adds to evidence that PFOS may modestly reduce antibody response, but it did not measure clinical vaccine effectiveness.

Jung EM, Rhee J, Keil AP, et al (2026). Serum Per- and Polyfluoroalkyl Substances in Relation to Circulating Thyroxine Levels and Thyroid Cancer Risk. Environment International.

PFAS may perturb thyroid hormones, but available evidence does not show a uniform direction or an established increase in thyroid cancer.

Lin CY, Lee HL, Su TC (2026). Longitudinal PFAS Exposure and Thyroid Function Trajectories in Taiwanese Youth: A 10-Year Prospective Cohort Study. Environment International.

PFAS may perturb thyroid hormones, but available evidence does not show a uniform direction or an established increase in thyroid cancer.

Wu X, Braun JM, Papandonatos GD, et al (2026). Does the Timing of Sample Collection Confound the Association Between Prenatal Serum PFAS Concentrations and Birthweight. Environment International.

PFOA may have a small effect on fetal growth, but the best evidence shows that late-pregnancy sampling can exaggerate the association.

Brede C, Fjeldal P, Skjevrak I, Herikstad H (2003). Increased migration levels of bisphenol A from polycarbonate baby bottles after dishwashing, boiling and brushing. Food Additives and Contaminants.

Dishwashing does not have one universal effect. It may accelerate degradation in some polymers but remove surface contamination from others.

Swan SH, Main KM, Liu F, et al (2005). Decrease in anogenital distance among male infants with prenatal phthalate exposure. Environmental Health Perspectives.

A small 2005 US study associated several prenatal phthalate biomarkers with shorter male anogenital measurements, but its estimates were imprecise and noncausal.

Biedermann S, Tschudin P, Grob K (2010). Transfer of bisphenol A from thermal printer paper to the skin. Analytical and Bioanalytical Chemistry.

Thermal receipts can be a BPA exposure source, particularly with prolonged occupational handling. Evidence does not show that briefly touching one receipt causes illness.

Carwile JL, Ye X, Zhou X, Calafat AM, Michels KB (2011). Canned soup consumption and urinary bisphenol A: a randomized crossover trial. JAMA.

In one trial, five days of canned soup sharply increased urinary BPA compared with fresh soup. Current cans may use different coatings.

Rudel RA, Gray JM, Engel CL, et al (2011). Food packaging and bisphenol A and bis(2-ethylhexyl) phthalate exposure: findings from a dietary intervention. Environmental Health Perspectives.

A small intervention showed that less-packaged fresh food can lower short-term BPA and DEHP biomarkers. It did not show improved health.

Dodson RE, Nishioka M, Standley LJ, Perovich LJ, Brody JG, Rudel RA (2012). Endocrine disruptors and asthma-associated chemicals in consumer products. Environmental Health Perspectives.

Some fragranced personal-care products use DEP as a solvent or fixative and can measurably increase urinary MEP. Do not claim that every synthetic fragrance contains DEP.

Moreira MA, André LC, Cardeal ZL (2013). Analysis of phthalate migration to food simulants in plastic containers during microwave operations. International Journal of Environmental Research and Public Health.

Heating can increase migration from some containers, especially with longer or hotter contact. It is not accurate to say that every microwave-safe plastic releases endocrine disruptors.

Parlett LE, Calafat AM, Swan SH (2013). Women’s exposure to phthalates in relation to use of personal care products. Journal of Exposure Science & Environmental Epidemiology.

Some fragranced personal-care products use DEP as a solvent or fixative and can measurably increase urinary MEP. Do not claim that every synthetic fragrance contains DEP.

Sathyanarayana S, Alcedo G, Saelens BE, et al (2013). Unexpected results in a randomized dietary trial to reduce phthalate and bisphenol A exposures. Journal of Exposure Science & Environmental Epidemiology.

Avoiding plastic packaging does not guarantee lower phthalate exposure because ingredients and food-processing equipment can dominate.

Ehrlich S, Calafat AM, Humblet O, Smith T, Hauser R (2014). Handling of thermal receipts as a source of exposure to bisphenol A. JAMA.

Thermal receipts can be a BPA exposure source, particularly with prolonged occupational handling. Evidence does not show that briefly touching one receipt causes illness.

Factor-Litvak P, Insel B, Calafat AM, et al (2014). Persistent Associations between Maternal Prenatal Exposure to Phthalates on Child IQ at Age 7 Years. PLOS ONE.

Some cohorts associate prenatal DBP, DiBP, or BBP biomarkers with lower cognitive or language scores, but the evidence is observational and not consistently replicated.

Hormann AM, Vom Saal FS, Nagel SC, et al (2014). Holding thermal receipt paper and eating food after using hand sanitizer results in high serum bioactive and urine total levels of bisphenol A. PLOS ONE.

Avoid handling receipts immediately after applying oily or penetration-enhancing hand products, especially before eating. Do not present this small extreme experiment as typical exposure.

Zota AR, Calafat AM, Woodruff TJ (2014). Temporal trends in phthalate exposures: findings from the National Health and Nutrition Examination Survey, 2001-2010. Environmental Health Perspectives.

US exposure patterns show substitution, not a uniform disappearance of plasticizers. Several older phthalates declined while some replacements increased.

Rochester JR, Bolden AL (2015). Bisphenol S and F: A Systematic Review and Comparison of the Hormonal Activity of Bisphenol A Substitutes. Environmental Health Perspectives.

BPS and BPF have not been demonstrated safer than BPA. Experimental endocrine activity is documented, but their real-world human risks are less well characterized.

Swan SH, Sathyanarayana S, Barrett ES, et al (2015). First trimester phthalate exposure and anogenital distance in newborns. Human Reproduction.

A 2015 US cohort associated ten-fold higher prenatal DEHP biomarkers with about 1 to 1.4 mm shorter male anogenital distance. This was an association with a developmental marker, not proof of impaired fertility.

Levine H, Jørgensen N, Martino-Andrade A, et al (2017). Temporal trends in sperm count: a systematic review and meta-regression analysis. Human Reproduction Update.

Large meta-regressions estimate that average sperm counts have fallen substantially since the 1970s. They do not prove a corresponding loss of fertility or that plastics caused the trend.

Nassan FL, Coull BA, Gaskins AJ, et al (2017). Personal Care Product Use in Men and Urinary Concentrations of Select Phthalate Metabolites and Parabens. Environmental Health Perspectives.

Some fragranced personal-care products use DEP as a solvent or fixative and can measurably increase urinary MEP. Do not claim that every synthetic fragrance contains DEP.

Bornehag CG, Lindh C, Reichenberg A, et al (2018). Association of Prenatal Phthalate Exposure With Language Development in Early Childhood. JAMA Pediatrics.

Some cohorts associate prenatal DBP, DiBP, or BBP biomarkers with lower cognitive or language scores, but the evidence is observational and not consistently replicated.

Lehmler HJ, Liu B, Gadogbe M, Bao W (2018). Exposure to Bisphenol A, Bisphenol F, and Bisphenol S in U.S. Adults and Children: NHANES 2013-2014. ACS Omega.

BPS and BPF exposure is widespread, but urinary detection alone says nothing about whether the measured level is harmful.

Camacho L, Lewis SM, Vanlandingham MM, et al (2019). A two-year toxicology study of bisphenol A in Sprague-Dawley rats: CLARITY-BPA core study results. Food and Chemical Toxicology.

EFSA’s threshold is scientifically contested, particularly because it rests on an intermediate mouse immune endpoint. A prominent critique was chemical-industry funded.

Pelch K, Wignall JA, Goldstone AE, et al (2019). A scoping review of the health and toxicological activity of bisphenol A structural analogues and functional alternatives. Toxicology.

BPS and BPF have not been demonstrated safer than BPA. Experimental endocrine activity is documented, but their real-world human risks are less well characterized.

Adgent MA, Carroll KN, Hazlehurst MF, et al (2020). A combined cohort analysis of prenatal exposure to phthalate mixtures and childhood asthma. Environment International.

Early-life phthalate biomarkers may be associated with small increases in asthma or wheeze risk, but results are inconsistent and do not establish causation.

Khmiri I, Côté J, Mantha M, et al (2020). Toxicokinetics of bisphenol-S and its glucuronide in plasma and urine following oral and dermal exposure in volunteers. Environment International.

BPS is absorbable and metabolized in humans. This does not show that ordinary BPA-free products are safe or harmful.

ASTM International (2021). D7611/D7611M-21: Standard Practice for Coding Plastic Manufactured Articles for Resin Identification. ASTM International.

Use the code to identify the broad polymer family, not to rank safety. Code 7 does not always mean BPA, and code 1 does not mean DEHP.

Holmes R, Ma J, Andra SS, Wang HS (2021). Effect of Common Consumer Washing Methods on Bisphenol A Release in Tritan Drinking Bottles. Chemosphere.

Dishwashing does not have one universal effect. It may accelerate degradation in some polymers but remove surface contamination from others.

Zimmermann L, Bartosova Z, Braun K, Oehlmann J, Völker C, Wagner M (2021). Plastic Products Leach Chemicals That Induce In Vitro Toxicity under Realistic Use Conditions. Environmental Science & Technology.

Products with the same resin code can have very different chemical profiles. This study identifies potential hazards, not the probability of harm from normal use.

Boulicault M, Perret M, Galka J, et al (2022). The future of sperm: a biovariability framework for understanding global sperm count trends. Human Fertility.

The size, geography, clinical meaning, and causes of sperm-count trends remain contested. Claims of a proven chemical-driven fertility crisis exceed the evidence.

An J, Roh HH, Jeong H, Lee KY, Rhim T (2023). Rapid Assessment of Di(2-ethylhexyl) Phthalate Migration from Consumer PVC Products. Toxics.

Migration is highest when the chemical, material, food matrix, temperature, and contact time favor it. ‘Fat always causes more leaching’ and ‘acid always causes more leaching’ are too simplistic.

Domínguez-Romero E, Komprdová K, Kalina J, et al (2023). Time-trends in human urinary concentrations of phthalates and substitutes DEHT and DINCH in Asian and North American countries (2009-2019). Journal of Exposure Science & Environmental Epidemiology.

US exposure patterns show substitution, not a uniform disappearance of plasticizers. Several older phthalates declined while some replacements increased.

EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (2023). Re-evaluation of the risks to public health related to the presence of bisphenol A in foodstuffs. EFSA Journal.

EFSA concluded in 2023 that dietary BPA presents a health concern and set a TDI of 0.2 ng/kg/day. The threshold is precautionary and animal-derived, not a proven human-disease boundary.

Levine H, Jørgensen N, Martino-Andrade A, Mendiola J, Weksler-Derri D, Jolles M et al (2023). Temporal trends in sperm count: a systematic review and meta-regression analysis of samples collected globally in the 20th and 21st centuries. Human Reproduction Update.

Large meta-regressions estimate that average sperm counts have fallen substantially since the 1970s. They do not prove a corresponding loss of fertility or that plastics caused the trend.

Oskar S, Mook J, Smith MK, Huang X, McDonald JA (2024). Temporal trends in phthalate metabolite exposure of girls in the United States across sociodemographic factors and intersectional social identities: NHANES 2001-2018. Environmental Research.

US exposure patterns show substitution, not a uniform disappearance of plasticizers. Several older phthalates declined while some replacements increased.

Prueitt RL, Goodman JE (2024). Evidence evaluated by European Food Safety Authority does not support lowering the temporary tolerable daily intake for bisphenol A. Toxicological Sciences.

EFSA’s threshold is scientifically contested, particularly because it rests on an intermediate mouse immune endpoint. A prominent critique was chemical-industry funded.

Boissiere-O’Neill T, Lazarevic N, Sly PD, et al (2025). Phthalates and bisphenols early-life exposure, and childhood allergic conditions: a pooled analysis of cohort studies. Journal of Exposure Science & Environmental Epidemiology.

Early-life phthalate biomarkers may be associated with small increases in asthma or wheeze risk, but results are inconsistent and do not establish causation.

Cajachagua-Torres KN, Salvi NB, Seok E, et al (2025). Prenatal phthalate exposure and anogenital distance in infants at 12 months. Environment International.

Newer evidence does not show that prenatal phthalates consistently shorten male AGD. Findings differ across cohorts and measurement ages.

Geueke B, Parkinson LV, Groh KJ, Kassotis CD, Maffini MV, Martin OV et al (2025). Evidence for widespread human exposure to food contact chemicals. Journal of Exposure Science & Environmental Epidemiology.

Many chemicals used in food-contact materials are detectable in humans, but detection does not prove that packaging supplied the exposure or that the level is harmful.

Lewis K, Cannarella R, Liu F, et al (2025). Sperm concentration remains stable among fertile American men: a systematic review and meta-analysis. Fertility and Sterility.

The size, geography, clinical meaning, and causes of sperm-count trends remain contested. Claims of a proven chemical-driven fertility crisis exceed the evidence.

Plachetka L, Stanislas V, Bauer A, Göen T, Denghel H, Michels KB (2025). Urinary bisphenol levels and blood pressure after soda consumption from cans, PET and glass bottles. Scientific Reports.

Packaging can modestly affect short-term BPA exposure, but glass is not guaranteed to produce the lowest urinary level in every experiment.

Isci G (2026). Quantitative evaluation of bisphenol A, S, and F migration from canned beverages: impact of storage conditions and associated health risk assessment. Food Research International.

Warm, prolonged storage increased bisphenol migration in this small experiment. Evidence for acidity was weaker and cannot be generalized to every coating.

Park S, McArthur K, Barrett E, et al (2026). Prenatal phthalate exposure and neurodevelopmental delay in early childhood (1 to 3 years): An Environmental influences on Child Health Outcomes study. Environment International.

The newest large US study found small, mixed, and sex-dependent associations rather than consistent developmental harm.

Shin M, Lim JE, Mok S, Liao C, Moon HB (2026). Occurrence and human exposure assessment of bisphenol analogues in various paper products from Korea. Frontiers in Public Health.

A BPA-free receipt may use BPS instead. The available market data do not establish what proportion of current US receipts use either chemical.

Tsykhotska O, Valleix M, Bruel S, et al (2026). Assessment of Pergafast 201 absorption and metabolism in viable human skin. Environment International.

A BPA-free receipt may use BPS instead. The available market data do not establish what proportion of current US receipts use either chemical.

Chevrier J, Harley KG, Bradman A, Gharbi M, Sjödin A, Eskenazi B (2010). Polybrominated diphenyl ether flame retardants and thyroid hormone during pregnancy. Environmental Health Perspectives.

PBDE exposure has been associated with altered thyroid markers during pregnancy, but evidence does not prove clinical thyroid disease.

Stapleton HM, Klosterhaus S, Eagle S, et al (2011). Identification of flame retardants in polyurethane foam collected from baby products. Environmental Science & Technology.

A 2011 survey found a flame retardant in most tested polyurethane foam baby products, from a period before several of these chemicals were phased out of use.

Watkins DJ, McClean MD, Fraser AJ, et al (2011). Exposure to PBDEs in the Office Environment: Evaluating the Relationships Between Dust, Handwipes, and Serum. Environmental Health Perspectives.

Office workers who washed their hands less often had more flame-retardant residue on their hands, and higher hand contamination tracked with higher blood levels.

Stapleton HM, Eagle S, Sjödin A, Webster TF (2012). Serum PBDEs in a North Carolina Toddler Cohort: Associations with Handwipes, House Dust, and Socioeconomic Variables. Environmental Health Perspectives.

A toddler cohort found flame retardants in nearly all blood, hand-wipe, and house-dust samples tested, with hand contamination tracking blood levels more closely than house dust did.

Eskenazi B, Chevrier J, Rauch SA, et al (2013). In utero and childhood polybrominated diphenyl ether exposures and neurodevelopment in the CHAMACOS study. Environmental Health Perspectives.

Developmental PBDE exposure is associated with modestly lower childhood IQ. This is stronger than most replacement-flame-retardant evidence, but it remains observational.

Ballesteros-Gómez A, et al (2014). Analysis of two alternative organophosphorus flame retardants in electronic and plastic consumer products: Resorcinol bis-(diphenylphosphate) (PBDPP) and bisphenol A bis (diphenylphosphate) (BPA-BDPP). Chemosphere.

A small survey of electronic and plastic consumer products found two alternative organophosphate flame retardants in about half of the items tested.

Cooper EM, Kroeger G, Davis K, Clark CR, Ferguson PL, Stapleton HM (2016). Results from Screening Polyurethane Foam Based Consumer Products for Flame Retardant Chemicals. Environmental Science & Technology.

A nationwide survey found an identifiable flame retardant in about half of tested household foam furniture samples across 44 states.

Lam J, Lanphear BP, Bellinger D, et al (2017). Developmental PBDE Exposure and IQ/ADHD in Childhood: A Systematic Review and Meta-analysis. Environmental Health Perspectives.

Developmental PBDE exposure is associated with modestly lower childhood IQ. This is stronger than most replacement-flame-retardant evidence, but it remains observational.

Preston EV, McClean MD, Claus Henn B, et al (2017). Associations between urinary diphenyl phosphate and thyroid function. Environment International.

A small repeated-measures study linked a flame-retardant exposure marker to slightly higher total thyroid hormone in adults, especially women, while other thyroid measures were unaffected.

Kosuth M, Mason SA, Wattenberg EV (2018). Anthropogenic contamination of tap water, beer, and sea salt. PLoS One.

Particles have been reported in both tap and bottled water. Current methods do not support a universal claim that one is always more contaminated than the other.

Kuang J, Abdallah MAE, Harrad S (2018). Brominated flame retardants in black plastic kitchen utensils: Concentrations and human exposure implications. Science of the Total Environment.

A UK survey found brominated flame retardants in some black plastic kitchen utensils, especially ones that tested high in bromine on initial screening, and simulated cooking transferred some of that into hot oil.

Mason SA, Welch VG, Neratko J (2018). Synthetic Polymer Contamination in Bottled Water. Frontiers in Chemistry.

Sensitive imaging found many nanoscale particles in three bottled-water brands, but the tested sample was small and particle count alone does not establish health risk.

De Falco F, Di Pace E, Cocca M, Avella M (2019). The contribution of washing processes of synthetic clothes to microplastic pollution. Scientific Reports.

Synthetic textiles and indoor dust can contribute particles, but available studies do not establish a dominant source ranking or disease risk.

Gibson EA, Stapleton HM, Calero L, et al (2019). Flame retardant exposure assessment: findings from a behavioral intervention study. Journal of Exposure Science & Environmental Epidemiology.

A small randomized trial found that a simple handwashing routine cut a flame-retardant exposure marker in urine by about half.

Hernandez LM, Xu EG, Larsson HCE, Tahara R, Maisuria VB, Tufenkji N (2019). Plastic Teabags Release Billions of Microparticles and Nanoparticles into Tea. Environmental Science & Technology.

Plastic tea bags can release particles when steeped, but the famous billion-particle count remains analytically disputed.

Liu C, Li J, Zhang Y, et al (2019). Widespread distribution of PET and PC microplastics in dust in urban China and their estimated human exposure. Environment International.

House dust from 39 Chinese cities contained widely varying levels of PET and polycarbonate microplastic particles, with modeled child exposure depending heavily on assumptions about dust ingestion.

Vianello A, Jensen RL, Liu L, Vollertsen J (2019). Simulating human exposure to indoor airborne microplastics using a Breathing Thermal Manikin. Scientific Reports.

A breathing-manikin study estimated indoor airborne microplastic levels in three apartments, but found that most inhaled fibers were natural, not synthetic plastic.

Busse K, Ebner I, Humpf HU, et al (2020). Comment on “Plastic Teabags Release Billions of Microparticles and Nanoparticles into Tea”. Environmental Science & Technology.

Plastic tea bags can release particles when steeped, but the famous billion-particle count remains analytically disputed.

Du F, Cai H, Zhang Q, Chen Q, Shi H (2020). Microplastics in take-out food containers. Journal of Hazardous Materials.

Take-out food containers shed a small number of microplastic particles when rinsed, though most particles did not match the container's own plastic type.

Hernandez LM et al (2020). Response to Comment on “Plastic Teabags Release Billions of Microparticles and Nanoparticles into Tea”. Environmental Science & Technology.

Plastic tea bags can release particles when steeped, but the famous billion-particle count remains analytically disputed.

Li D, Shi Y, Yang L, et al (2020). Microplastic release from the degradation of polypropylene feeding bottles during infant formula preparation. Nature Food.

Preparing infant formula in polypropylene bottles using WHO-recommended hot-water steps released large numbers of microplastic particles, with modeled infant intake varying enormously by preparation method.

Mohamed Nor NH, Kooi M, Diepens NJ, Koelmans AA (2021). Lifetime accumulation of microplastic in children and adults. Environmental Science & Technology.

The credit-card figure is not a measured average and is too uncertain to use as a factual health claim.

Ragusa A, Svelato A, Santacroce C, et al (2021). Plasticenta: First evidence of microplastics in human placenta. Environment International.

A small Raman study found microscopic particles in four of six placentas, but most polymer assignments were uncertain.

Senathirajah K, Attwood S, Bhagwat G, Carbery M, Wilson S, Palanisami T (2021). Estimation of the mass of microplastics ingested: A pivotal first step towards human health risk assessment. Journal of Hazardous Materials.

The claim originated in a WWF-commissioned 2019 modeling report. It was not a measurement of plastic recovered from people.

Jenner LC, Rotchell JM, Bennett RT, Cowen M, Tentzeris V, Sadofsky LR (2022). Detection of microplastics in human lung tissue using μFTIR spectroscopy. Science of the Total Environment.

Microplastics have been identified in surgical lung tissue, supporting inhalation as a plausible route, but not proving pulmonary harm.

Leslie HA, van Velzen MJM, Brandsma SH, Vethaak AD, Garcia-Vallejo JJ, Lamoree MH (2022). Discovery and quantification of plastic particle pollution in human blood. Environment International.

Plastic-associated material has been detected in human blood, but its exact particle form and health significance remain uncertain.

Pletz M (2022). Ingested microplastics: Do humans eat one credit card per week?. Journal of Hazardous Materials Letters.

The credit-card figure is not a measured average and is too uncertain to use as a factual health claim.

Shi Y, Li D, Xiao L, et al (2022). The influence of drinking water constituents on the level of microplastic release from plastic kettles. Journal of Hazardous Materials.

Boiling a plastic kettle repeatedly with normal tap water released far fewer microplastic particles over time than boiling it with purified water, likely from mineral buildup on the surface.

Hussain KA, Romanova S, Okur I, et al (2023). Assessing the Release of Microplastics and Nanoplastics from Plastic Containers and Reusable Food Pouches: Implications for Human Health. Environmental Science & Technology.

Microwave heating increased release from several tested plastic products. Using glass or ceramic for heating is a reasonable precaution, but disease prevention has not been demonstrated.

Yadav H, Khan MRH, Quadir M, et al (2023). Cutting Boards: An Overlooked Source of Microplastics in Human Food?. Environmental Science & Technology.

Plastic cutting boards shed particles during cutting. Annual figures are modeled release, not proof that a person eats that amount.

Chartres N, Cooper CB, Bland G, et al (2024). Effects of Microplastic Exposure on Human Digestive, Reproductive, and Respiratory Health: A Rapid Systematic Review. Environmental Science & Technology.

Microplastics are a plausible health hazard, but current evidence does not establish the risk of disease from ordinary household exposure.

Garcia MA, Liu R, Nihart A, et al (2024). Quantitation and identification of microplastics accumulation in human placental specimens using pyrolysis gas chromatography mass spectrometry. Toxicological Sciences.

A larger study measured plastic-associated mass in every placenta tested, but the method did not prove how many intact particles were present or that they caused harm.

Hoehn RM, et al (2024). Flame Retardant Exposure in Vehicles Is Influenced by Use in Seat Foam and Temperature. Environmental Science & Technology.

Wearable samplers placed in more than 100 vehicles found a flame retardant (TCIPP) in nearly every car, at levels that varied with seat foam and outdoor temperature.

Hu CJ, Garcia MA, Nihart A, et al (2024). Microplastic presence in dog and human testis and its potential association with sperm count and weights of testis and epididymis. Toxicological Sciences.

Plastic-associated mass was reported in human testes, but the study did not show reduced human sperm count, infertility, or reproductive harm.

Liu M, Brandsma SH, Schreder E (2024). From e-waste to living space: Flame retardants contaminating household items add to concern about plastic recycling. Chemosphere.

Some black plastic household products contain legacy or replacement flame retardants, especially products with high bromine. The study did not show that 85 percent of all black plastic is contaminated.

Marfella R, Prattichizzo F, Sardu C, et al (2024). Microplastics and Nanoplastics in Atheromas and Cardiovascular Events. New England Journal of Medicine.

Plastic-associated material in carotid plaque was associated with later cardiovascular events in a high-risk surgical population. The study did not show that plastics caused those events.

Qian N, Gao X, Lang X, et al (2024). Rapid single-particle chemical imaging of nanoplastics by SRS microscopy. Proceedings of the National Academy of Sciences.

Sensitive imaging found many nanoscale particles in three bottled-water brands, but the tested sample was small and particle count alone does not establish health risk.

Liu M, Brandsma SH, Schreder E (2025). Corrigendum to ‘From e-waste to living space: Flame retardants contaminating household items add to concern about plastic recycling’ [Chemosphere 365 (2024) 143319]. Chemosphere.

This published correction fixed a reference-dose miscalculation in the original black-plastic-utensil flame-retardant study; the corrected numbers still describe modest, not high, exposure.

Liu M, Brandsma SH, Schreder E (2025). Corrigendum to ‘From e-waste to living space: Flame retardants contaminating household items add to concern about plastic recycling’ [Chemosphere Volume 365 (2024) 143319]. Chemosphere.

A second correction fixed a related transfer-rate formula error in the same black-plastic-utensil study, lowering the estimated flame-retardant intake from cooking utensils.

Nihart AJ, Garcia MA, El Hayek E, et al (2025). Bioaccumulation of microplastics in decedent human brains. Nature Medicine.

A 2025 study reported high plastic-associated measurements in postmortem brain, but major analytical uncertainties remain and it did not show that plastics cause dementia.

Nihart AJ, Garcia MA, El Hayek E, et al (2025). Correction: Bioaccumulation of microplastics in decedent human brains. Nature Medicine.

A 2025 study reported high plastic-associated measurements in postmortem brain, but major analytical uncertainties remain and it did not show that plastics cause dementia.

Shi K, Okoffo ED, Fu H, et al (2025). Release of nanoplastic from polypropylene kettles. npj Emerging Contaminants.

Polypropylene kettles can release particles, particularly when new, but release declines with use and hard-water mineral buildup. No human health risk was quantified.

Vaezafshar S, et al (2025). Are Sleeping Children Exposed to Plasticizers, Flame Retardants, and UV-Filters from Their Mattresses?. Environmental Science & Technology.

Testing of new children's mattresses found flame retardants and UV-filter chemicals in roughly half the samples, with warmth increasing how much was released into the air.

Zhang Y, Gao Q, Gao Q, et al (2025). Microplastics and nanoplastics increase major adverse cardiac events in patients with myocardial infarction. Journal of Hazardous Materials.

This study adds a second cardiovascular association but still does not prove that plastic particles cause cardiovascular events.

Ames JL, Ferrara A, Feng J, et al (2026). Exposure to Organophosphate Ester Flame Retardants and Plasticizers during Pregnancy and Autism-Related Outcomes in the ECHO Cohort. Environmental Health Perspectives.

A 15-cohort US study found one organophosphate flame-retardant marker modestly associated with higher autism-diagnosis odds, while a different marker was unexpectedly linked to lower odds, an inconsistent pattern that needs more research.

Attfield KR, et al (2026). Flame retardant biomarker changes with furniture replacement after flammability standard update. Environmental Pollution.

Replacing older furniture with newer, lower-flame-retardant furniture was linked to a faster decline in blood flame-retardant levels than keeping older furniture.

Cheng Y, Abrishamcar S, Ma T, et al (2026). Association between maternal organophosphate esters metabolite levels during pregnancy and internalizing and externalizing behaviors in children at 2-5 years. Environmental Epidemiology.

A South African cohort linked prenatal exposure to a flame-retardant marker to more behavioral problems at 2 and 3.5 years old, but the association did not persist by age 5.

Durkin AM, Skrabanja TLP, Gehring U, et al (2026). Micro- and nanoplastic exposure, immune cell activation, and lung function in young adults. Microplastics and Nanoplastics.

A 2026 study corroborated blood detection but did not find impaired lung function and cannot show that the measured plastics caused immune changes.

Foster SA, Kile ML, Hystad P, et al (2026). Organophosphate ester flame retardants and plasticizers in house dust and Child Behavior Checklist outcomes: A nested study in the Canadian CHILD Birth Cohort. Journal of Exposure Science & Environmental Epidemiology.

A Canadian birth-cohort study linked higher household-dust levels of the flame retardant TCEP to modestly higher odds of behavioral problems in children.

Ghassabian A, Etzel T, Ames JL, et al (2026). Prenatal exposure to organophosphate ester flame retardants and child cognition: Findings from the Environmental influences on Child Health Outcomes cohort. Environmental Pollution.

In a large US cohort, higher prenatal exposure to one organophosphate flame-retardant marker was linked to a small drop in child cognition scores, while the more common TDCPP marker showed no link.

Shen Y, Ning Y, Chen F, et al (2026). Impact of placental microplastics on birth anthropometrics: A cross-sectional study. Ecotoxicology and Environmental Safety.

A large 2026 cohort found an association with smaller newborn size, but replication and clearer exposure-response interpretation are needed before claiming causation.

McMurry LM, Oethinger M, Levy SB (1998). Triclosan Targets Lipid Synthesis. Nature.

Laboratory resistance mechanisms are real, but evidence that ordinary household use produced clinically important resistance remains limited.

Green A, Williams G, Neale R, et al (1999). Daily Sunscreen Application and Betacarotene Supplementation in Prevention of Basal-Cell and Squamous-Cell Carcinomas of the Skin: A Randomised Controlled Trial. Lancet.

Continue using broad-spectrum sunscreen as part of comprehensive sun protection. Absorption findings are not evidence that sunscreen is more dangerous than ultraviolet exposure.

Black RE, Hurley FJ, Havery DC (2001). Occurrence of 1,4-Dioxane in Cosmetic Raw Materials and Finished Cosmetic Products. Journal of AOAC International.

Ethoxylated ingredients can carry trace 1,4-dioxane, but an ingredient name alone does not prove contamination in a finished product.

Byford JR, Shaw LE, Drew MGB, Pope GS, Sauer MJ, Darbre PD (2002). Oestrogenic Activity of Parabens in MCF7 Human Breast Cancer Cells. Journal of Steroid Biochemistry and Molecular Biology.

Some parabens have weak estrogen-like activity in laboratory studies, but this does not establish endocrine disease or cancer from cosmetic use.

Darbre PD, Aljarrah A, Miller WR, Coldham NG, Sauer MJ, Pope GS (2004). Concentrations of Parabens in Human Breast Tumours. Journal of Applied Toxicology.

Parabens have been detected in breast tissue, but detection does not show that they came from underarm products or caused cancer.

Aiello AE, Marshall B, Levy SB, Della-Latta P, Lin SX, Larson E (2005). Antibacterial Cleaning Products and Drug Resistance. Emerging Infectious Diseases.

Laboratory resistance mechanisms are real, but evidence that ordinary household use produced clinically important resistance remains limited.

Aiello AE, Larson EL, Levy SB (2007). Consumer Antibacterial Soaps: Effective or Just Risky?. Clinical Infectious Diseases.

FDA removed triclosan and triclocarban from consumer antibacterial washes because adequate safety and added-benefit evidence was lacking. Plain soap works as well for routine washing.

Janjua NR, Mortensen GK, Andersson AM, Kongshoj B, Skakkebaek NE, Wulf HC (2007). Systemic Uptake of Diethyl Phthalate, Dibutyl Phthalate, and Butyl Paraben Following Whole-Body Topical Application and Reproductive and Thyroid Hormone Levels in Humans. Environmental Science & Technology.

Butylparaben can be absorbed through skin, but absorption alone is not evidence of harm.

Allmyr M, Panagiotidis G, Sparve E, Diczfalusy U, Sandborgh-Englund G (2009). Human Exposure to Triclosan via Toothpaste Does Not Change CYP3A4 Activity or Plasma Concentrations of Thyroid Hormones. Basic & Clinical Pharmacology & Toxicology.

Triclosan and triclocarban are absorbed, but human evidence has not established endocrine injury or cancer causation.

Christiansen S, Scholze M, Dalgaard M, et al (2009). Synergistic Disruption of External Male Sex Organ Development by a Mixture of Four Antiandrogens. Environmental Health Perspectives.

Mixtures sharing a biological pathway may add together, but claims that all trace cosmetic mixtures are synergistically toxic go beyond the evidence.

Green AC, Williams GM, Logan V, Strutton GM (2011). Reduced Melanoma after Regular Sunscreen Use: Randomized Trial Follow-Up. Journal of Clinical Oncology.

Continue using broad-spectrum sunscreen as part of comprehensive sun protection. Absorption findings are not evidence that sunscreen is more dangerous than ultraviolet exposure.

Schebb NH, Inceoglu B, Ahn KC, Morisseau C, Gee SJ, Hammock BD (2011). Investigation of Human Exposure to Triclocarban after Showering and Preliminary Evaluation of Its Biological Effects. Environmental Science & Technology.

Triclosan and triclocarban are absorbed, but human evidence has not established endocrine injury or cancer causation.

Barr L, Metaxas G, Harbach CA, Savoy LA, Darbre PD (2012). Measurement of Paraben Concentrations in Human Breast Tissue at Serial Locations across the Breast from Axilla to Sternum. Journal of Applied Toxicology.

Parabens have been detected in breast tissue, but detection does not show that they came from underarm products or caused cancer.

Diepgen TL, Ofenloch R, Bruze M, et al (2015). Prevalence of Fragrance Contact Allergy in the General Population of Five European Countries: A Cross-Sectional Study. British Journal of Dermatology.

Fragrance is a meaningful contact-allergy concern for susceptible people, whether the source ingredient is natural or synthetic.

Lv C, Hou J, Xie W, Cheng H (2015). Investigation on Formaldehyde Release from Preservatives in Cosmetics. International Journal of Cosmetic Science.

Formaldehyde-releasing preservatives can release different amounts depending on formulation and storage. An ingredient list cannot predict the exact released concentration.

Boberg J, Axelstad M, Svingen T, et al (2016). Multiple Endocrine Disrupting Effects in Rats Perinatally Exposed to Butylparaben. Toxicological Sciences.

Some parabens have weak estrogen-like activity in laboratory studies, but this does not establish endocrine disease or cancer from cosmetic use.

Harley KG, Kogut K, Madrigal DS, et al (2016). Reducing Phthalate, Paraben, and Phenol Exposure from Personal Care Products in Adolescent Girls: Findings from the HERMOSA Intervention Study. Environmental Health Perspectives.

Product substitution can lower exposure to selected chemicals within days, but lower biomarkers have not yet been shown to produce a clinical benefit.

Matta MK, Zusterzeel R, Pilli NR, et al (2019). Effect of Sunscreen Application under Maximal Use Conditions on Plasma Concentration of Sunscreen Active Ingredients: A Randomized Clinical Trial. JAMA.

Some sunscreen filters enter the bloodstream. Exceeding FDA’s 0.5 ng/mL threshold means more safety data are required, not that harm has been found.

Eberle CE, Sandler DP, Taylor KW, White AJ (2020). Hair Dye and Chemical Straightener Use and Breast Cancer Risk in a Large US Population of Black and White Women. International Journal of Cancer.

Some prospective evidence links frequent use of certain hair products with breast cancer, but results vary by product and population and do not establish causation.

Matta MK, Florian J, Zusterzeel R, et al (2020). Effect of Sunscreen Application on Plasma Concentration of Sunscreen Active Ingredients: A Randomized Clinical Trial. JAMA.

Some sunscreen filters enter the bloodstream. Exceeding FDA’s 0.5 ng/mL threshold means more safety data are required, not that harm has been found.

O’Brien KM, Tworoger SS, Harris HR, et al (2020). Association of Powder Use in the Genital Area with Risk of Ovarian Cancer. JAMA.

Some case-control studies report a modest ovarian-cancer association, but prospective evidence is weaker and does not show a dose-response trend. The causal question remains unsettled.

Zhang Y, Birmann BM, Han J, et al (2020). Personal Use of Permanent Hair Dyes and Cancer Risk and Mortality in US Women: Prospective Cohort Study. BMJ.

Evidence does not support saying that personal permanent hair dye broadly causes cancer. Some product, frequency, and cancer-subtype associations still require study.

Atwater AR, Petty AJ, Liu B, et al (2021). Contact Dermatitis Associated with Preservatives: Retrospective Analysis of North American Contact Dermatitis Group Data, 1994 through 2016. Journal of the American Academy of Dermatology.

People with diagnosed formaldehyde allergy may need to avoid formaldehyde and formaldehyde-releasing preservatives.

Chang CJ, O’Brien KM, Keil AP, et al (2022). Use of Straighteners and Other Hair Products and Incident Uterine Cancer. Journal of the National Cancer Institute.

Frequent straightener or relaxer use was associated with higher uterine-cancer incidence in one large cohort. The finding does not identify a causal product or ingredient.

Waters LJ, Quah XL (2022). Predicting Skin Permeability Using HuskinDB. Scientific Data.

Some ingredients cross skin and others cross poorly. The amount cannot be reduced to one universal percentage.

Søgaard R, Poulsen PB, Gelardi RM, Geschke S, Schwensen JFB, Johansen JD (2024). Hidden Formaldehyde in Cosmetic Products. Contact Dermatitis.

Formaldehyde-releasing preservatives can release different amounts depending on formulation and storage. An ingredient list cannot predict the exact released concentration.

Trinh TTK, Myung SK, Tran TH, Choi KS (2024). Use of Antiperspirant Products and Risk of Breast Cancer: A Meta-Analysis of Case-Control Studies. Cancer Investigation.

Current human evidence and major cancer authorities do not support a claim that antiperspirants, deodorants, or parabens cause breast cancer.

Eckert E, Jäger T, Leibold E, Bader M, Göen T, Hiller J (2025). Dermal Penetration of 2-Phenoxyethanol in Humans: In Vivo Metabolism and Toxicokinetics. Archives of Toxicology.

Phenoxyethanol is absorbed through skin, but absorption alone is not evidence of toxicity. Current human studies are too small to evaluate long-term clinical outcomes.

Houle MC, DeKoven JG, Atwater AR, et al (2025). North American Contact Dermatitis Group Patch Test Results: 2021-2022. Dermatitis.

Fragrance is a meaningful contact-allergy concern for susceptible people, whether the source ingredient is natural or synthetic.

Lee A, Choi S, Park NY, et al (2025). Effects of Dietary Sources and Personal Care Products on Paraben Exposure in Young Korean Adults: A Crossover Intervention Study. Chemosphere.

Substitution can reduce some biomarkers, but dominant sources differ. Cosmetics are not necessarily the main source of every measured chemical.

Xiong Y, Li Z, Xiong X, et al (2025). Associations between Phenol and Paraben Exposure and the Risk of Developing Breast Cancer in Adult Women: A Cross-Sectional Study. Scientific Reports.

Triclosan and triclocarban are absorbed, but human evidence has not established endocrine injury or cancer causation.

Bailey JT, Chang CJ, Gaston SA, et al (2026). Use of Hair Straighteners and Chemical Relaxers and Incidence of Non-Reproductive Cancers. Journal of the National Cancer Institute.

New cancer signals were reported in 2026, but they are not yet sufficiently replicated for causal consumer claims.

Greene RK, Maghfour J, Nguyen C, Baker G, Mesinkovska NA (2026). Association between Hair Dye Use and Human Cancers: A Systematic Review. JAAD International.

Evidence does not support saying that personal permanent hair dye broadly causes cancer. Some product, frequency, and cancer-subtype associations still require study.

Hiller J, Eckert E, Jäger T, Bader M, Kaifie A, Göen T (2026). Influence of the Exposed Anatomic Sites on the Human In Vivo Percutaneous Absorption of the Amphiphilic 2-Phenoxyethanol. Archives of Toxicology.

Phenoxyethanol is absorbed through skin, but absorption alone is not evidence of toxicity. Current human studies are too small to evaluate long-term clinical outcomes.

Jovanovic N, Bright F, Thomsen C, et al (2026). Levers to Decrease Exposure to Harmful Chemicals: The Case of Personal Care Products and Cosmetics. Environment International.

Substitution can reduce some biomarkers, but dominant sources differ. Cosmetics are not necessarily the main source of every measured chemical.

Seyyedsalehi MS, Powley WA, Boffetta P (2026). Talc Exposure and Risk of Ovarian Cancer: A Systematic Review and Meta-Analysis with Limited Evidence on Cervical and Endometrial Cancers. Cancers.

Some case-control studies report a modest ovarian-cancer association, but prospective evidence is weaker and does not show a dose-response trend. The causal question remains unsettled.

Wei Y, Holder SE, Zhu J, Chambers CC (2026). Association between Urinary Paraben Concentrations and Skin Cancer among US Adults. Cancer Epidemiology.

A new cross-sectional study reported an association that requires prospective replication. It does not show that parabens cause skin cancer.

Wu D, Burstyn I, Thompson WJ, Qian J, Mundt KA (2026). Recall Bias in Population-Based Case-Control Studies of Ovarian Cancer and Genital Talcum Powder Use: Potential Impact and Quantitative Bias Analysis. BMC Medical Research Methodology.

Some case-control studies report a modest ovarian-cancer association, but prospective evidence is weaker and does not show a dose-response trend. The causal question remains unsettled.

Allred EN, Bleecker ER, Chaitman BR, et al (1989). Short-term effects of carbon monoxide exposure on the exercise performance of subjects with coronary artery disease. New England Journal of Medicine.

A randomized trial in 63 men with coronary artery disease found that even moderate carbon monoxide exposure shortened the time to exercise-induced chest pain and heart strain.

Adir Y, Merdler A, Ben Haim S, Front A, Harduf R, Bitterman H (1999). Effects of exposure to low concentrations of carbon monoxide on exercise performance and myocardial perfusion in young healthy men. Occupational and Environmental Medicine.

A randomized trial in healthy young men found that low-level carbon monoxide exposure reduced exercise duration and capacity, even without a detected drop in heart blood flow.

Institute of Medicine, Committee on Damp Indoor Spaces and Health (2004). Damp Indoor Spaces and Health. Damp Indoor Spaces and Health.

A National Academies review found consistent associations between dampness, visible mold, and mold odor and a higher risk of respiratory and allergic symptoms.

Darby S, Hill D, Auvinen A, et al (2005). Radon in homes and risk of lung cancer: collaborative analysis of individual data from 13 European case-control studies. BMJ.

Long-term residential radon is associated with increasing lung-cancer risk in a dose-response pattern. The evidence supports a causal interpretation when combined with miner studies, radiation biology, and dosimetry, although residential studies themselves are observational.

Krewski D, Lubin JH, Zielinski JM, et al (2005). Residential radon and risk of lung cancer: a combined analysis of 7 North American case-control studies. Epidemiology.

Long-term residential radon is associated with increasing lung-cancer risk in a dose-response pattern. The evidence supports a causal interpretation when combined with miner studies, radiation biology, and dosimetry, although residential studies themselves are observational.

Britigan N, Alshawa A, Nizkorodov SA (2006). Quantification of ozone levels in indoor environments generated by ionization and ozonolysis air purifiers. Journal of the Air & Waste Management Association.

Intentional ozone generators should not be used in occupied spaces. Ionizers and electrostatic devices can emit ozone even when ozone is not their stated purpose.

Destaillats H, Lunden MM, Singer BC, et al (2006). Indoor secondary pollutants from household product emissions in the presence of ozone: A bench-scale chamber study. Environmental Science & Technology.

A bench-scale chamber study found that common household products released terpenes that reacted with ozone to form formaldehyde and other secondary pollutants.

Zock JP, Plana E, Jarvis D, et al (2007). The use of household cleaning sprays and adult asthma: an international longitudinal study. American Journal of Respiratory and Critical Care Medicine.

A prospective cohort of more than 3,500 adults found that frequent household cleaning-spray use was associated with more asthma symptoms and medication use.

Hampson NB, Hauff NM (2008). Carboxyhemoglobin levels in carbon monoxide poisoning: do they correlate with the clinical picture?. American Journal of Emergency Medicine.

A review of more than 1,400 carbon monoxide poisoning cases found that blood carboxyhemoglobin levels overlapped substantially between people who died and people who survived, so a single reading cannot reliably predict outcome.

Delp WW, Singer BC (2012). Performance assessment of U.S. residential cooking exhaust hoods. Environmental Science & Technology.

Outdoor-venting hoods reduce pollutant exposure only to the extent that they capture the plume. Capture varies enormously with airflow, geometry, burner position, installation, and use.

Quansah R, Jaakkola MS, Hugg TT, Heikkinen SA, Jaakkola JJ (2012). Residential dampness and molds and the risk of developing asthma: a systematic review and meta-analysis. PLOS ONE.

A systematic review and meta-analysis of dampness and mold studies found a similarly modest, consistent association with higher asthma risk.

Sidheswaran MA, Destaillats H, Sullivan DP, Cohn S, Fisk WJ (2012). Energy efficient indoor VOC air cleaning with activated carbon fiber filters. Building and Environment.

Activated carbon can adsorb selected gases, but capacity is finite and pollutant-specific. Thin carbon sheets can saturate quickly and may later release adsorbed material.

Singer BC, Delp WW, Price PN, Apte MG (2012). Performance of installed cooking exhaust devices. Indoor Air.

Outdoor-venting hoods reduce pollutant exposure only to the extent that they capture the plume. Capture varies enormously with airflow, geometry, burner position, installation, and use.

Lin W, Brunekreef B, Gehring U (2013). Meta-analysis of the effects of indoor nitrogen dioxide and gas cooking on asthma and wheeze in children. International Journal of Epidemiology.

Gas cooking is associated with childhood asthma in observational studies, and measured indoor NO₂ is associated more consistently with wheeze than with diagnosed asthma. The exact causal contribution remains uncertain.

Liang W, Yang S, Yang X (2015). Long-Term Formaldehyde Emissions from Medium-Density Fiberboard in a Full-Scale Experimental Room: Emission Characteristics and the Effects of Temperature and Humidity. Environmental Science & Technology.

A 29-month chamber study of one engineered-wood material found that formaldehyde emissions declined over time but rose again in hot, humid conditions, so a product cannot be assumed fully off-gassed after a fixed number of days.

Lunden MM, Delp WW, Singer BC (2015). Capture efficiency of cooking-related fine and ultrafine particles by residential exhaust hoods. Indoor Air.

Outdoor-venting hoods reduce pollutant exposure only to the extent that they capture the plume. Capture varies enormously with airflow, geometry, burner position, installation, and use.

Nurmatov UB, Tagiyeva N, Semple S, Devereux G, Sheikh A (2015). Volatile organic compounds and risk of asthma and allergy: a systematic review. European Respiratory Review.

A systematic review of 53 studies found generally poor-quality, mixed evidence linking household VOC exposure as a broad class to asthma or allergy.

Shi S, Zhu S, Lee ES, Zhao B, Zhu Y (2016). Performance of wearable ionization air cleaners: Ozone emission and particle removal. Aerosol Science and Technology.

Intentional ozone generators should not be used in occupied spaces. Ionizers and electrostatic devices can emit ozone even when ozone is not their stated purpose.

Di Q, Wang Y, Zanobetti A, et al (2017). Air Pollution and Mortality in the Medicare Population. New England Journal of Medicine.

A cohort of more than 60 million Medicare beneficiaries found that higher long-term fine-particle air pollution was associated with higher all-cause mortality, including at levels below the annual ambient standard.

Svanes Ø, Bertelsen RJ, Lygre SHL, et al (2018). Cleaning at Home and at Work in Relation to Lung Function Decline and Airway Obstruction. American Journal of Respiratory and Critical Care Medicine.

The same international cohort found that frequent cleaning activity, at work and at home, was associated with faster long-term lung-function decline.

Cummings BE, Waring MS (2020). Potted plants do not improve indoor air quality: a review and analysis of reported VOC removal efficiencies. Journal of Exposure Science & Environmental Epidemiology.

A review of chamber studies found that houseplant VOC-removal rates measured in small sealed test chambers do not translate into a meaningful air-cleaning effect in an ordinarily ventilated home.

Zhao H, Chan WR, Delp WW, Tang H, Walker IS, Singer BC (2020). Factors Impacting Range Hood Use in California Houses and Low-Income Apartments. International Journal of Environmental Research and Public Health.

Outdoor-venting hoods reduce pollutant exposure only to the extent that they capture the plume. Capture varies enormously with airflow, geometry, burner position, installation, and use.

Riederer AM, Krenz JE, Tchong-French MI, et al (2021). Effectiveness of portable HEPA air cleaners on reducing indoor PM₂.₅ and NH₃ in an agricultural cohort of children with asthma: A randomized intervention trial. Indoor Air.

A properly tested HEPA filter has at least 99.97% efficiency for 0.3 µm particles passing through the filter. The 0.3 µm rating does not mean smaller particles pass freely.

Salthammer T, Gu J, Wientzek S, Harrington R, Thomann S (2021). Measurement and evaluation of gaseous and particulate emissions from burning scented and unscented candles. Environment International.

Chamber testing of scented and unscented candles found that most modeled residential concentrations of particles and combustion byproducts stayed below comparison guidance values, though some scenarios exceeded them.

Gruenwald T, Seals BA, Knibbs LD, Hosgood HD III (2022). Population Attributable Fraction of Gas Stoves and Childhood Asthma in the United States. International Journal of Environmental Research and Public Health.

Gas cooking is associated with childhood asthma in observational studies, and measured indoor NO₂ is associated more consistently with wheeze than with diagnosed asthma. The exact causal contribution remains uncertain.

Kang I, McCreery A, Azimi P, et al (2022). Indoor air quality impacts of residential mechanical ventilation system retrofits in existing homes in Chicago, IL. Science of the Total Environment.

A two-year crossover study of ventilation retrofits in 40 Chicago homes found that balanced mechanical ventilation with outdoor kitchen exhaust measurably lowered indoor carbon dioxide, nitrogen dioxide, and particle levels.

Lebel ED, Michanowicz DR, Bilsback KR, et al (2022). Composition, Emissions, and Air Quality Impacts of Hazardous Air Pollutants in Unburned Natural Gas from Residential Stoves in California. Environmental Science & Technology.

The same measurement study found that unburned natural gas leaking from stove fittings, not just combustion, can itself contain benzene and other hazardous air pollutants.

Tanzer-Gruener R, Rajan PE, Dugan LD, Bier ME, Robinson AL, Presto AA (2022). Watching Paint Dry: Organic Vapor Emissions from Architectural Coatings and their Impact on Secondary Organic Aerosol Formation. Environmental Science & Technology.

A chamber study of architectural paint found that it released organic vapors capable of forming secondary air pollutants as it dried, which does not by itself establish a household disease risk.

Kashtan YS, Nicholson M, Finnegan C, et al (2023). Gas and Propane Combustion from Stoves Emits Benzene and Increases Indoor Air Pollution. Environmental Science & Technology.

Measurements in dozens of California and Colorado homes found that gas and propane stoves emitted benzene while burning, at rates far higher than electric stoves.

Sørensen SB, Feilberg A, Kristensen K (2023). Removal of volatile organic compounds by mobile air cleaners: Dynamics, limitations, and possible side effects. Building and Environment.

Activated carbon can adsorb selected gases, but capacity is finite and pollutant-specific. Thin carbon sheets can saturate quickly and may later release adsorbed material.

Warburton T, Grange SK, Hopkins JR, et al (2023). The impact of plug-in fragrance diffusers on residential indoor VOC concentrations. Environmental Science: Processes & Impacts.

Repeated measurements in 60 UK homes found that plug-in fragrance diffusers measurably raised indoor fragrance-related VOC levels, especially in poorly ventilated homes.

Harding-Smith E, Shaw DR, Shaw M, Dillon TJ, Carslaw N (2024). Does green mean clean? Volatile organic emissions from regular versus green cleaning products. Environmental Science: Processes & Impacts.

The same chamber-testing approach found that products marketed as green did not reliably emit fewer volatile organic compounds than conventional cleaning products.

Hurraß J, Heinzow B, Walser-Reichenbach S, et al (2024). AWMF mold guideline ‘Medical clinical diagnostics for indoor mold exposure’: Update 2023 AWMF Register No. 161/001. Allergologie Select.

A 2023 German medical society guideline concluded that CIRS diagnosis, urine mycotoxin testing, genetic susceptibility panels, and mold-detoxification protocols are not established clinical practice for indoor mold exposure.

Kashtan Y, Nicholson M, Finnegan CJ, et al (2024). Nitrogen dioxide exposure, health outcomes, and associated demographic disparities due to gas and propane combustion by U.S. stoves. Science Advances.

A measurement and modeling study of gas, propane, and electric stoves in 20 counties found higher nitrogen dioxide emissions from gas and propane models, with modeled health impacts falling more heavily on some demographic groups.

Li J, Zhao H, Russell ML, et al (2024). Air pollutant exposure concentrations from cooking a meal with a gas or induction cooktop and the effectiveness of two recirculating range hoods with filters. Indoor Environments.

Recirculating hoods can reduce cooking particles and sometimes odors or selected VOCs, but they are not equivalent to outdoor exhaust and do not discharge heat, water vapor, or combustion gases outdoors.

Li W, Goodman JE, Long C (2024). Population attributable fraction of gas cooking and childhood asthma: What was missed?. Global Epidemiology.

Gas cooking is associated with childhood asthma in observational studies, and measured indoor NO₂ is associated more consistently with wheeze than with diagnosed asthma. The exact causal contribution remains uncertain.

Hu Y, Liang W, Gao Y, Zhang J (2025). Preliminary investigation of volatile organic compounds and odor emissions from emulsion paint and laminate flooring in dynamic environmental chamber. Building and Environment.

A chamber study of emulsion paint and laminate flooring found measurable volatile organic compound and odor emissions during the drying and off-gassing period.

Zhao H, Martin E, Khan T, et al (2025). Mechanical ventilation and indoor air quality in recently constructed homes in the humid climate of the Southeast U.S. Indoor Environments.

A similar crossover study in recently built, humid-climate Southeast US homes found that mechanical ventilation and outdoor kitchen exhaust likewise reduced indoor pollutant concentrations.

Johnson M, Kearns KA, Rivera J, et al (2026). Characterizing household air pollutant concentrations associated with an electrification program in the rural San Joaquin Valley. Environmental Research: Health.

A companion measurement study of the same rural electrification program found lower indoor air pollutant concentrations after households switched from gas to electric appliances.

Laursen KR, Woodland T, Schaber C, et al (2026). Investigating short-term lung inflammation using exhaled breath VOCs from exposure to candles: a randomized controlled crossover study among young mild asthmatics. Journal of Breath Research.

A randomized crossover study in young people with mild asthma found short-term changes in exhaled-breath markers after candle exposure, without establishing long-term harm from ordinary candle use.

Sehgal AR, Schuellerman P, Dolata J, et al (2026). Asthma Control Before and After Changing Gas Stoves to Electric Stoves. Journal of Allergy and Clinical Immunology: In Practice.

An uncontrolled before-and-after study of people with poorly controlled asthma found that switching from gas to electric stoves was followed by lower indoor nitrogen dioxide and improved asthma-control scores.

Wołoszczuk K, Pawłowska Z, Szyłak-Szydłowski M, Norenberg M, Lemańska J (2026). Mitigating Indoor Radon Exposure: The Effect of Air Purifiers on Radon Progeny. Sustainability.

HEPA filters do not remove radon gas. Ordinary consumer carbon filters are not validated radon mitigation. Air cleaners may remove some airborne decay products, but radon continues entering and generates new progeny.

Walton G (1951). Survey of literature relating to infant methemoglobinemia due to nitrate-contaminated water. American Journal of Public Health and the Nation’s Health.

Water above 10 mg/L nitrate-N should not be used to prepare infant formula. Boiling can increase the concentration.

Waller K, Swan SH, DeLorenze G, Hopkins B (1998). Trihalomethanes in drinking water and spontaneous abortion. Epidemiology.

Describe reproductive findings as mixed observational associations, not established effects of drinking compliant tap water.

Araya M, Chen B, Klevay LM, et al (2003). Confirmation of an acute no-observed-adverse-effect and low-observed-adverse-effect level for copper in bottled drinking water in a multi-site international study. Regulatory Toxicology and Pharmacology.

Elevated copper usually indicates plumbing corrosion. Test first, then use corrosion correction or a treatment carrying a specific copper claim.

Lanphear BP, Hornung R, Khoury J, et al (2005). Low-level environmental lead exposure and children’s intellectual function: an international pooled analysis. Environmental Health Perspectives.

There is no identified safe lead exposure for children. Even comparatively low blood lead levels are associated with poorer cognitive performance.

Gilliom RJ, Barbash JE, Crawford CG, et al (2006). Pesticides in the Nation's Streams and Ground Water, 1992-2001. US Geological Survey, Circular 1291.

A national US Geological Survey study of streams and groundwater found pesticides such as atrazine present at generally low concentrations in most agricultural wells tested.

Villanueva CM, Cantor KP, Grimalt JO, et al (2007). Bladder cancer and exposure to water disinfection by-products through ingestion, bathing, showering, and swimming in pools. American Journal of Epidemiology.

Long-term higher THM exposure is associated with bladder cancer, but the evidence does not prove that a particular compliant tap-water concentration causes cancer.

DeSimone LA, Hamilton PA, Gilliom RJ (2009). Quality of Water from Domestic Wells in Principal Aquifers of the United States, 1991-2004. US Geological Survey, Circular 1332.

Private wells can look and taste normal while exceeding a health benchmark, so laboratory testing is necessary.

Argos M, Kalra T, Rathouz PJ, et al (2010). Arsenic exposure from drinking water, and all-cause and chronic-disease mortalities in Bangladesh: a prospective cohort study. Lancet.

The health hazard from chronically high arsenic is established, but numerical risks from concentrations near 10 µg/L remain less certain.

Costet N, Villanueva CM, Jaakkola JJK, et al (2011). Water disinfection by-products and bladder cancer: is there a European specificity? A pooled and meta-analysis of European case-control studies. Occupational and Environmental Medicine.

Long-term higher THM exposure is associated with bladder cancer, but the evidence does not prove that a particular compliant tap-water concentration causes cancer.

Hoogestraat GK (2012). Occurrence of Anthropogenic Organic Compounds and Nutrients in Source and Finished Water in the Sioux Falls Area, South Dakota, 2009-10. US Geological Survey, Scientific Investigations Report 2012-5098.

A USGS survey of source and finished water in the Sioux Falls area detected dozens of organic compounds, almost all at very low trace concentrations.

Del Toral MA, Porter A, Schock MR (2013). Detection and evaluation of elevated lead release from service lines: a field study. Environmental Science & Technology.

Use only cold water for drinking and cooking, flush after stagnation according to local guidance, and do not rely on flushing alone when a lead source is present.

Battaglin WA, Meyer MT, Kuivila KM, Dietze JE (2014). Glyphosate and its degradation product AMPA occur frequently and widely in US soils, surface water, groundwater, and precipitation. Journal of the American Water Resources Association.

Pesticides are sometimes detectable at low concentrations, especially in agricultural source water. Detection alone does not show that exposure is harmful.

Trueman BF, Camara E, Gagnon GA (2016). Evaluating the effects of full and partial lead service line replacement on lead levels in drinking water. Environmental Science & Technology.

Use only cold water for drinking and cooking, flush after stagnation according to local guidance, and do not rely on flushing alone when a lead source is present.

Schullehner J, Hansen B, Thygesen M, Pedersen CB, Sigsgaard T (2018). Nitrate in drinking water and colorectal cancer risk: a nationwide population-based cohort study. International Journal of Cancer.

Some cohorts suggest a small colorectal-cancer association below the MCL, but pooled reviews conflict. Do not describe low-level nitrate as a proven cause of colorectal cancer.

Elwood JM, van der Werf B (2022). Nitrates in drinking water and cancers of the colon and rectum: a meta-analysis of epidemiological studies. Cancer Epidemiology.

Some cohorts suggest a small colorectal-cancer association below the MCL, but pooled reviews conflict. Do not describe low-level nitrate as a proven cause of colorectal cancer.

Picetti R, Deeney M, Pastorino S, et al (2022). Nitrate and nitrite contamination in drinking water and cancer risk: A systematic review with meta-analysis. Environmental Research.

Some cohorts suggest a small colorectal-cancer association below the MCL, but pooled reviews conflict. Do not describe low-level nitrate as a proven cause of colorectal cancer.

Iheozor-Ejiofor Z, Walsh T, Lewis SR, et al (2024). Water fluoridation for the prevention of dental caries. Cochrane Database of Systematic Reviews.

Fluoridation is supported by CDC and ADA, but contemporary estimates of the size of the dental benefit are smaller and less certain than older estimates.

National Toxicology Program (2024). NTP monograph on the state of the science concerning fluoride exposure and neurodevelopment and cognition: a systematic review. NTP Monograph 8.

NTP found a consistent association at higher exposures, mainly above 1.5 mg/L. It did not establish harm or safety at 0.7 mg/L.

Deiana G, Filippini T, Dettori M, Vinceti M, Azara A (2025). Exposure to disinfection by-products and risk of birth defects: A systematic review and dose-response meta-analysis. Science of the Total Environment.

Describe reproductive findings as mixed observational associations, not established effects of drinking compliant tap water.

Taylor KW, Eftim SE, Sibrizzi CA, et al (2025). Fluoride exposure and children’s IQ scores: a systematic review and meta-analysis. JAMA Pediatrics.

The pooled evidence supports an inverse exposure-IQ association, but the effect at US fluoridation concentrations remains uncertain.

Xie B, Chen J, Kai J, Li J (2025). Association between drinking water disinfection byproducts exposure and human bladder cancer: A time-updated meta-analysis of trihalomethanes. Journal of Hazardous Materials.

Long-term higher THM exposure is associated with bladder cancer, but the evidence does not prove that a particular compliant tap-water concentration causes cancer.