What it is
A synthetic organic alcohol, clear viscous liquid. Can be petroleum-derived or corn-derived.
What it does
Humectant, solvent, and freeze-thaw stabiliser.
Why it’s a concern
Identified by the American Contact Dermatitis Society as the 2018 Allergen of the Year due to rising contact dermatitis rates. Can enhance penetration of other ingredients into skin. Generally considered safe for ingestion but cumulative dermal exposure is under-studied.
Also known as
PG1,2-propanediol
CAS numbers
57-55-6
Commonly found in
cosmeticsfoode-cigarette liquidmedication
Safer alternatives
- vegetable glycerin
- corn-derived propanediol (1,3-propanediol)
Sources
- ACDS Allergen of the Year 2018