Carnosine is a naturally occurring dipeptide (beta-alanine and L-histidine) used in skincare for its antioxidant and anti-glycation properties, helping protect against oxidative stress and protein cross-linking associated with skin aging. It is typically incorporated into serums and creams at low concentrations as a supporting active.
| Reported effect | How often | Notes |
|---|---|---|
| Mild transient irritation or redness | Rare | Generally well tolerated topically; minor irritation possible in sensitive individuals. |
| Contact dermatitis or allergic reaction | Very rare | Isolated sensitivity reactions; not commonly reported in the literature. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.