Iodopropynyl Butylcarbamate

A halogenated preservative used to prevent microbial growth in leave-on and rinse-off cosmetics. Published assessments consider it safe at permitted use levels, but it is a recognized contact allergen; people with known sensitizer profiles or a history of cosmetic dermatitis should patch-test products containing it.

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.