Constant consumption of this famous "longevity herb" is said to help prematurely graying hair. It is believed to increase energy, build and clean the blood and relieve high blood pressure-related headaches. It is also consumed as a sexual tonic. Research indicates Ho Shou Wu increases sperm production in men and increases fertility in women. It combines well with Lycium (Kou Chi Tza), Cuscuta (Tu Si Tzi), Tang Kwei and Ginseng to make a famous and powerful tonic.