PEG-40 stearate is a polyethylene glycol ester of stearic acid, commonly used as an emulsifier and surfactant in cosmetic and pharmaceutical formulations. It stabilizes oil-in-water emulsions, enhances solubility of ingredients, and provides mild cleansing properties. This ingredient improves spreadability, texture, and absorption in skincare and haircare products. It is widely applied in creams, lotions, shampoos, and topical drug formulations.
