Stearic acid is a fatty acid typically produced by hydrolysis of common animal and vegetable fats and oils, followed by fractionation (distillation or crystallization) of the resulting fatty acids. Pressing methods separate the liquid unsaturated fatty acids from the solid saturated fatty acids. Stearic acid used in cosmetics is usually pressed two or three times, resulting in different concentrations.[4] Cosmetic-grade stearic acids are usually mixtures of fatty acids, depending on how they’re manufactured and where they come from (often they’re combined with palmitic acid).[5] There are several grades of stearic acid available commercially.[6]
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