Glycerin monostearate, also known as glyceryl monostearate or GMS, is a compound formed by the esterification of stearic acid and glycerin. It is a white or creamy solid, typically in the form of flakes, pellets, or powder. Glycerin monostearate is widely used as an emulsifier, stabilizer, and thickening agent in various industries, including food, pharmaceuticals, cosmetics, and personal care products.