Universal Tribulus Pro - New Potent Pro Formula Contains 40% Steroidal Saponins Extract! Tribulus terrestris L. herb Found natively in Bulgaria, this peculiar herb contains some interesting phytochemicals that can benefit any bodybuilder or competitive athlete. What are these phytochemicals? Steroidal saponins. These steroidal saponins found in tribulus have been used by the world-class Bulgarian powerlifting team for record lifts. In fact, studies performed in Europe found that tribulus use could increase testosterone’s production by 30% or more in only five days. Researchers believe that the steroidal saponins in tribulus might have a stimulating effect on luteinizing hormone (LH), a gonad-stimulating hormone which can positively affect testosterone production. For every possible competitive edge, use Tribulus Pro. Instructions: Take 1-2 capsules daily, preferably with a meal.