surfactant · emulsifier
Steareth-21
Commonly feared, low concern·Moderate evidence
A surfactant derived from stearyl alcohol with a higher degree of ethoxylation than Steareth-2, providing enhanced emulsification. It is graded safe for cosmetic use and well tolerated.
The myth vs the evidence
The "eth" suffix indicates ethoxylation, which clean beauty sometimes conflates with PEG concerns. Steareth-21 is approved for cosmetic use. The evidence does not support the fear.
Products with Steareth-21
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.