An emulsifier that also keeps the oil and liquid parts of a solution from separating. Its other functions include altering the thickness of a liquid, increasing foaming capacity, and stabilizing foams. When applied to the skin, it gives it a smooth feel and helps prevent moisture loss. Many products incorporate this ingredient because of its unique sensory properties and non-greasy feel after application. It's mainly used in face/body lotions and creams, but can also be found in deodorant, lipstick and foundation.