Petrolatum, commonly known as petroleum jelly, is a semi-solid mixture sourced from petroleum, a fossil fuel. Petrolatum is used in a wide range of skincare products like lip balms, moisturizers, ointments and creams created to provide intense hydration, protect skin's moisture barrier and soothe dry or chapped skin. It can also be found in hand and body creams, as well as in products for specific skin concerns including dry elbows, knees and heels. It's important to only use pharmaceutical-grade or highly refined petrolatum in skincare products, since these are generally free of harmful impurities.