Propylene glycol is a small glycol molecule widely used in skincare as a humectant, solvent, and penetration enhancer that helps attract water and dissolve other ingredients. It is considered a base/formulation ingredient rather than a therapeutic active.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or stinging | Common | More likely at higher concentrations or on compromised/sensitive skin |
Allergic contact dermatitis | Uncommon | Recognized contact allergen; confirmed via patch testing |
Irritant contact dermatitis | Uncommon | Non-allergic irritation, often dose-dependent |
Worsening of pre-existing eczema or barrier-impaired skin | Rare | Penetration-enhancing effect may increase reactivity |
Systemic toxicity from topical use | Very rare | Reported mainly with extensive application on broken skin, especially in infants or burn patients |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.