Tribulus Terrestris is an invasive species and noxious weed, but also a flowering perennial plant that is native to warmer to tropical regions of Europe, south of Asia, Africa, north of Australia and recently naturalized in both of the Americas. Historically, the Tribulus terrestris was recognized by the traditional Chinese medicine and the Indian ayurveda. Because of the increases in testosterone levels, also dihydrotestosterone and dehydroepiandrosterone, Tribulus terrestris was deemed an aphrodisiac, but also a nerve tonic and diuretic. Protodioscin was identified as the active chemical in T. terrestris, which is a relative to DHEA. These traits have made this supplement very popular with the body building community, and also why it was used in Biotest Tribex Gold,Tribulus terrestris is used as a promoter of a stable libido function and to augment the muscle tone.