Horny Goat Weed PowderHorny goat weed is an ornamental plant that also has a long history of traditional use in Chinese herbalism. In China, horny goat weed is called yin yang huo because it is a tonic for the female (yin) and the male (yang). Epimedium was thought to "tonify life's gate" a term used to refer to the "vital energy" in men. Helps to improve testosterone naturally. It helps to improve bones density naturally.