Steareth-100 is best considered within the finished formulation. Its cosmetic assessment requires non-irritating use, while its gel-forming and cleansing purposes describe how the product works rather than relief of seb derm.

The checked evidence did not establish independent human seb derm benefit or an exact-material Malassezia response. Steareth-100 is an alcohol ethoxylate, not free stearic acid; a shared carbon-chain name does not demonstrate fungal feeding. Consider the product’s intended exposure and personal comfort, and seek advice if irritation continues.