Cholesteryl octadecanoate-d35 is a deuterium-labeled form of Cholesteryl stearate. Cholesteryl stearate is an ester compound composed of cholesterol and stearic acid, both naturally occurring substances. This cholesterol ester is commonly found in both plant and animal sources. Known for its stability, Cholesteryl stearate is widely used in industrial and biomedical applications. It functions as a lubricant, thickener, and emollient in cosmetic formulations, such as lotions and creams, and is also utilized in the production of certain polymers and plastics.