Because the method of starting with roasted beans was developed in Jamaica, black castor oil is often referred to as Jamaican black castor oil. Black castor oil is an effective, natural remedy for cleansing and nourishing the skin, clearing away acne, and healing scars. It can promote hair growth, prevent hair breakage, soothe dry and itchy scalp, plus moisturize and nourish hair strands and follicles.