Tribulus terrestris is a plant in the Zygophyllaceae family that grows naturally in southern and eastern Europe, Asia and Africa. Saponins are molecules naturally present in certain plants with a steroid structure. Tribulus Fire Nutrition® is a concentrated formula of Tribulus Terrestris 90% saponins. It can be taken by men as a precursor to testosterone and by women to increase libido and help with menopausal symptoms. Helps maintain muscle tone and contributes to energy. Instructions for use: Take 2 capsules a day.