If healthy, moisturized hair tops your list of beauty goals, you’ve probably tried numerous products in its pursuit. You’ve also likely noticed castor oil listed among the ingredients of more than a few—and might even remember seeing bottles of it in your grandma or auntie’s medicine cabinet. That’s because castor oil has been used as a multi-purpose health and beauty solution in Africa, the Caribbean and Asia for centuries. Derived from the nut of the ricinus communis, better known as the castor plant, the oil is rich in naturally occurring glycerin, Vitamin E, and 18 fatty acids. These acids, which include Omega-3 acids, Omega-6 acids, Omega-9 acids, and ricinoleic acid, help skin and hair absorb other oils more fully and lock in moisture and nutrients.