Horny goat weed is a natural aphrodisiac that helps to increase the libido level in both men and women. The herb also helps to increase the erectile function in men along with overall sexual stamina in both sexes. Although the exact way in which horny goat weed works is not fully understood, it is believed that the herb increases nitric oxide which leads to relaxing of the smooth muscles. This effect allows for more blood flow to the penis and clitoris leading to heightened sexual levels. Horny goat weed is also useful in treating fatigue and has long been employed as reliever for the discomfort associated with menopausal.