Makes hair stronger. Replenishes. Rejuvenates. Nourishes. Natural Ingredients. Sunny Isle Jamaican Black Castor Oil Extra Dark are powerful all purpose soothing oils roasted and ground manually from Jamaican castor beans, then boiled to produce 100% pure castor oil. These pure and unrefined oils, retain their nutritive properties making them great for skin softening, moisturizing massage oils or as a hot oil treatment for dry treatments for dry damaged hair.