Ergothioneine

An amino acid antioxidant found naturally in mushrooms and some bacteria, emerging in cosmetics for its free-radical quenching properties. Limited human cosmetic studies exist, but ergothioneine is well tolerated in food and supplement forms, with low hazard potential indicated in available assessments.

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.