Milk peptide refers to short protein fragments derived from milk proteins (such as casein) that are used in skincare for their conditioning, moisturizing, and skin-firming properties. They may support skin barrier function and have been studied for potential collagen-supporting and antioxidant effects.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation or redness | Uncommon | Mild localized reaction possible, particularly on sensitive skin. |
| Allergic contact dermatitis | Rare | More likely in individuals with milk protein allergy or sensitization. |
| Itching or stinging | Uncommon | Transient sensation upon application. |
| Acneiform breakouts | Rare | Occasionally reported, possibly related to formulation rather than the peptide itself. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.