From the Manufacturer:
Maca [Glandular]. Maca (Lepidium meyenii), a tuber that is a member of the radish family that grows in the Andean mountains of South America, may provide a natural means for improving sexual desire and performance. Also known as Peruvian ginseng, maca may help enhance physical energy and endurance. As an adaptogen, it helps promote stamina and buffer the effects of stress. Animal studies show improvement in male subjects.