Histidine is an essential amino acid used in skincare as a humectant and skin-conditioning agent, helping to support the skin's natural moisturizing factor and antioxidant defenses. It may also help buffer formulations and bind metal ions.
| Reported effect | How often | Notes |
|---|---|---|
Mild irritation or stinging | Rare | Generally well tolerated; transient irritation possible on sensitive or compromised skin. |
Allergic contact dermatitis | Very rare | Isolated potential for sensitization, as with most topical ingredients. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.