thickener
Hydroxypropyl Methylcellulose
Generally safe·Strong evidence
A cellulose derivative used to thicken gels, serums, and cleansers. It is well studied and widely used in pharmaceuticals and cosmetics. No meaningful safety concerns have been raised at typical cosmetic use levels.
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.