Polyethylene Glycol (PEG) is a versatile petroleum-derived polymer used in skincare as a humectant, emollient, solvent, and surfactant base that improves texture, hydration, and ingredient delivery. It is considered a formulation ingredient rather than a treatment active.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation | Uncommon | More likely on compromised or broken skin barriers. |
Allergic contact dermatitis | Rare | Documented in patch-test studies, particularly with higher-molecular-weight PEGs or in damaged skin. |
Enhanced penetration of other ingredients | Uncommon | PEGs can increase absorption of co-formulated substances, potentially amplifying their effects. |
Contamination-related concerns (1,4-dioxane/ethylene oxide residues) | Rare | Trace byproducts from manufacturing; mitigated by purification standards in cosmetic-grade PEG. |
Systemic toxicity from absorption | Very rare | Reported mainly in burn patients or extensive open-wound exposure, not typical cosmetic use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.