Useful. Dr. Black Hair Blacking Essence contains Radix Sophorae Flavescentis, Polygonum Multiflori Radix, Ganoderma lucidum, ginger and other ingredients. These ingredients can provide nutrition for hair, promote hair growth and make hair tough and not easy to fall off. At the same time, Ganoderma lucidum and Polygonum multiflorum Thunb also have the function of hair care and blackening, which can make hair black and smooth and improve the problem of white hair, so Dr. Black Hair Blacking Essence is useful.