Whey protein is a milk-derived protein blend used in skincare as a conditioning agent that can support hydration and skin barrier function, with mild antioxidant properties attributed to its peptides and amino acids. It is sometimes promoted for soothing and moisturizing benefits in topical formulations.
| Reported effect | How often | Notes |
|---|---|---|
Allergic contact dermatitis | Rare | More likely in individuals with milk protein allergy; can cause redness, itching, or rash. |
Skin irritation | Uncommon | Mild transient stinging or irritation, often related to other formulation components. |
Urticaria (contact hives) | Very rare | Reported mainly in milk-allergic individuals upon skin contact. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.