What Is PEG 100 Stearate? PEG or polyethylene glycol stearate is an ingredient that is used in skincare and body care products. PEG 100 stearate is a soft waxy substance used in moisturizers, conditioners, shampoos, cleansers, and soap-free detergents. The 100 in PEG 100 stearate refers to the number of ethylene oxide monomers present on … Continue reading PEG 100 Stearate: Why is PEG 100 Stearate in My Skincare Product?