Some haircare products include oils, which are substances that are made up of molecules that are liquid at room temperature. Oils are often used to moisturize and nourish the hair, as well as to protect it from damage. Common types of oils used in haircare products include coconut oil, argan oil, jojoba oil, and olive oil. These oils can be found in a variety of haircare products, such as shampoos, conditioners, and styling products.