Definition: Oleostearate is a type of fatty acid that is found in plant oils. It is composed of three carbon atoms and one oxygen atom, and it is an essential component of many foods and beverages. In the context of dermatology, oleostearate may refer to certain types of moisturizers or other skincare products containing this ingredient. These products are intended for use on the skin's surface to help protect and nourish the skin barrier, such as reducing the appearance of fine lines,