(Acacia concinna) Acacia concinna (literally "hair fruit") has been used traditionally for hair care in the Indian subcontinent since ancient times. It nourishes the hair follicles. Shikakai is a great source of essential vitamins. Its vitamin C content in particular may help promote hair growth by strengthening collagen. In addition, it is a great source of antioxidants that help prevent free-radical damage and also serves as an excellent cleanser.