Hydrolyzed keratin is a protein derived from animal sources (such as wool or feathers) that has been broken down into smaller peptides for better absorption. It is used in hair and skin care to improve moisture retention, smoothness, and surface conditioning by forming a protective film.
| Reported effect | How often | Notes |
|---|---|---|
| Allergic contact dermatitis | Rare | Protein hydrolysates can occasionally trigger sensitization in predisposed individuals. |
| Skin or scalp irritation | Rare | Mild redness or itching reported, typically in those with sensitive skin. |
| Contact urticaria | Very rare | Immediate hypersensitivity reactions have been documented with hydrolyzed proteins in cosmetics. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.