Horny goat weed is an herb. The leaves are used to make medicine. As many as 15 horny goat weed species are known as “yin yang huo� in Chinese medicine.
Horny goat weed is used for weak back and knees, joint
pain, osteoarthritis, mental and physical fatigue, memory loss, high blood pressure, heart disease, bronchitis, liverdisease, HIV/AIDS, polio, a blood disorder called chronic leucopenia, viral infections of the heart, bone loss after menopause, weak bones (osteoporosis), and as a tonic.
Some men use horny goat weed for sexual performance problems including erectile dysfunction (ED) and involuntary ejaculation. It is also used to arouse sexual desire.