Polyglyceryl-3 Stearate Bon Émollient No known benefits Polyglyceryl-3 Stearate description Polyglyceryl-3 stearate is the ester of the fatty acid stearic acid and polyglycerin-3, which is a polymer of glycerine that contains three units. This synthetic ingredient is used in cosmetics to impart an emollient feel that conditions skin, as an emulsifier to keep unlike ingredients (think oil and water) blended, and, in greater amounts as a surfactant. It is considered safe and non-sensitizing as used in cosmetics. Related ingredients: Stearic Acid Glycerin