Polyurethane-100 is a synthetic polymer used in skincare and cosmetic formulations primarily as a film-forming agent, helping to create a smooth, flexible, water-resistant layer on the skin. It is commonly found in sunscreens, makeup, and long-wear products to improve durability and even distribution of other ingredients.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation | Rare | Occasional redness or stinging, typically in individuals with sensitive skin. |
| Contact dermatitis | Very rare | Allergic reactions are uncommon but possible, often linked to residual isocyanates or impurities. |
| Eye irritation | Rare | May occur if products migrate into the eyes; generally transient. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.