Kuza Jamaican Black Castor Oil Skin & Hair Treatment 4 Oz It renews, nourishes, hydrates, thickens and strengthens hair and prevents hair breakage and itchy scalp - perfect for all hair types and structures. Not only for the hair, but also for the skin, hydrating and nourishing it. Kuza Naturals Jamaican Black Castor Oils are derived from Jamaican castor beans that are roasted, ground and cooked to obtain 100% pure, unrefined oils that retain their nutritional properties.