Polyisobutene

A synthetic film-forming emollient that provides a protective, flexible layer on skin. Not absorbed and well tolerated with no documented safety issues in cosmetic 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.