Tribulus 500 mg standardized to minimum 45% saponins (100 capsules)

In one study, Tribulus terrestris increased spermatogenesis and sexual activity in laboratory animals. Tribulus terrestris appears to raise/turn on natural testosterone production in men via the activation of hormone secretion and estradiol. Clinical studies in Bulgaria have shown Tribulus terrestris to increase the sex hormones LH (luteinizing hormone) level by 72% and the body's own free testosterone level by 41% in healthy adult males in only five days. LH regulates the testosterone production in the testes and high levels of LH coincide with high testosterone levels.