Serine

A naturally occurring amino acid that is a key component of skin barrier lipids and the natural moisturizing factor. It binds water to the skin and is well established as a safe hydrating ingredient with no known sensitization concerns.

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.