Nonoxynol-40 is a cosmetic ingredient. Assessed as safe by the CIR.
Form
Liquid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Traditional Use
Nonionic surfactant developed in the mid-20th century for cosmetic formulations. Functions as an emulsifier and solubilizer in modern skincare and personal care products.