Polyhydroxystearic Acid is a polimer (polyester) from 12-hydroxystearic acid units, a soft waxy substance derived from natural raw materials such as castor oil. It is a multifunctional ingredient in skincare applications used as a dispersant for pigments and UV-reflecting minerals, emulsion stabilizer, thickener, and film former.
Improving consistency and sensory profile of formulation, Polyhydroxystearic Acid provides creamy textures and gel-like thickness for oil-based preparations. In sunscreens and decorative cosmetics, it provides even distribution, coating, and wetting of pigments and minerals such as titanium and zink oxides without a sticky or greasy feel and whitening.
Depending on concentrations, Polyhydroxystearic Acid decreases viscosity and delivers a wide range of thicknesses from pasty texture creams and solid lipsticks to liquid lotions and sprayable aerosols. It is a safe and chemically inert ingredient for skincare applications reviewed by CIR (Cosmetic Ingredient Review) experts panel in 2022.