Horny Goat Weed is called "Yin Yang Huo" in Chinese. A Chinese legend says a goat herder found that this weed could stimulate the sexual activities of his goats after these animals ate such weed. That is where the name "horny goat weed" is from. It is generally regarded as great alternative for impotent men. In fact, this herb is usually prescribed by Traditional Chinese doctors to treat male importency, along with other herbs.