Jamaican Black Castor Oil by Doo Gro, authentic oil from Jamaica, has been used for centuries as a natural remedy for a variety of conditions such as hair and skin problems as it provides the scalp and hair with highly beneficial nutrients.he dark nutrient-rich oil is obtained from beans that are roasted and ground by a manual Grinder and then the crushed beans are boiled to extract the 100% pure, dark brown, organic oil. It's the best quality oil on the market. The oil produced is frequently used as a hair treatment to repair damage and promote growth.JBCO has no added charcoal or color. It nourishes, moisturizes, thickens, softens, and detangles hair leaving it fortified and renewed while making it more manageable. Our Jamaican Black Castor Oil supports healthy growth for all hair types, including heat styled, chemically treated, natural and transitioning.