antioxidant · humectant · active
Fucoidan
Generally safe·Moderate evidence
A complex polysaccharide from brown seaweed that functions as a humectant and antioxidant in skincare formulations. Assessments indicate good tolerability in cosmetics, though individuals with shellfish or seaweed allergies should exercise caution.
References
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.