I have been taking wheatgrass chlorophyll tablets, which are concentrated extracts of wheatgrass juice. I have been taking them for half a year, and my hair has turned a lot darker. I have researched that hair graying is mainly related to the lack of trace elements in the hair. Trace elements iron and copper are important elements that promote the synthesis of melanin in hair. Iron deficiency can also cause hair to turn gray. Wheatgrass contains minerals such as calcium, iron, manganese, phosphorus, sodium, cobalt and zinc. The iron in the minerals can promote the production of melanin and may make hair black; in addition, according to medical clinical observation, if the body Long-term lack of protein, vegetable oil, vitamin B1, vitamin B2, and vitamin B6 can also cause hair to turn from black to white. Wheatgrass is rich in B vitamins, and long-term drinking of wheatgrass juice can make up for the lack of B vitamin intake.