Undecane

Undecane is a straight-chain hydrocarbon (an alkane) used as a lightweight, fast-spreading emollient and solvent, often paired with tridecane as a silicone alternative in modern formulas. It has not been reviewed under its own name, but CIR's assessment of the closely related isoparaffin and hydrocarbon solvent group, across a wide concentration range, did not turn up genotoxicity, reproductive, developmental, or carcinogenicity concerns.

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.