In China, Fo-Ti is called  He Shou Wu which means Mr. Wu of black hair. According to Chinese Folklore  Mr. Wu found this root and added it to his diet and his hair went from gray back to black. It claims many anti-aging properties. Fo-Ti is very high in Zinc. 

Fo Ti aged root, or polygonum multiflorum, is a medicinal herb with a long history of use. Studies have shown that it may have a variety of health benefits, including promoting hair growth and reducing signs of aging. It can be prepared as a tea, tincture, or dried for consumption.