Jamaican black castor oil for hair growth has been a tradition in Jamaica for many years. It's used as a universal solution for many hair and skin ailments. ... The protein and antioxidant-rich Jamaican black castor oil is known to make everything flourish. From eyebrows to eyelashes to entire skin. Castor oil, also known as Ricinus communis, is nutrient-rich vegetable oil from castor beans. Although it originates in tropical east Africa, it is widely used in India and the West Indies for cosmetic and medicinal purposes. Castor oil is usually clear or pale yellow unless derived through roasting or boiling, known as black castor oil.