Hydrolysed collagen is collagen broken down into smaller peptides and amino acids, used topically as a humectant and film former to improve skin hydration and surface smoothness. It binds water and forms a conditioning film, though intact collagen molecules are too large to penetrate the skin and topical effects are largely superficial.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation or redness | Rare | Generally well tolerated; mild irritation is uncommon and often related to other formulation components. |
| Allergic contact dermatitis | Rare | Sensitisation can occur, particularly in individuals allergic to the animal source (e.g. bovine, marine/fish). |
| Contact urticaria / hypersensitivity | Very rare | Reported mainly with marine-derived collagen in people with fish or shellfish allergies. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.