Shea Moisture Jamaican Black Castor Oil Strengthen and Grow Restorative Hair Serum. An intensive serum perfect for those who regularly color, straighten, perm or heat style their hair, as well as kinky, curly, or wavy natural styles. It nourishes the scalp and hair. Revives dull, damaged or chemically treated hair. Promotes growth by strengthening and conditioning hair, increasing resistance to breakage. Rosemary Oil stimulates the scalp to help support healthy hair growth.