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Contact SupplierStearic Acid is one of many fatty acids that occur naturally in various plants and animal derivatives. It's found in such products as animal tallow, cocoa butter and vegetable fats. When it's used in cosmetic products, stearic acid primarily fulfills the role of a thickener or hardener. Stearic acid is the substance that helps your bar of soap retain its shape just as it does in products such as candles.
Stearic acid also acts as an emulsifying agent, meaning it binds together materials, such as oil and water that would usually separate. If it weren't for stearic acid, your facial cleanser might not stay smooth and creamy, but would instead separate like oil and vinegar in salad dressing.