Propylene Glycol
INCI: Propylene Glycol · CAS: 57-55-6
Long-used humectant and penetration enhancer. Safe at cosmetic levels but an occasional contact allergen.
ComedogenicDescribes any ingredient, cosmetic, or skincare product that tends to clog pores. Scored 0 (non-comedogenic) to 5 (highly likely to clog pores).
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IrritancyRefers to the state or quality of being irritating, provoking annoyance, or causing physical discomfort. Scored 0 (well tolerated) to 5 (likely to irritate sensitive skin).
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EWGThe Environmental Working Group operates the EWG Skin Deep® Cosmetics Database, which evaluates the safety of tens of thousands of personal care products. Scored 0–10 based on hazard level: 0–2 low hazard, 3–6 moderate, 7–10 high.
3 / 10
Functions
humectant, solvent
Functions in a formula
- humectant
- solvent
Possible concerns
Also listed as
1,2-Propanediol · PG
Our matcher recognises all of these names automatically.
This page is continuously reviewed. Last updated 7/1/2026.
Informational only - not medical advice. See methodology.