Histidine

An amino acid used in skincare formulas to hydrate and condition the skin. Amino acids are well-tolerated at cosmetic use levels and have a long history of safe use.

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.