A study done with healthy individuals taking 750mg of tribulus per day showed a 72% LH increase, and a 41% increase in testosterone.

In a research conducted with 20 males and females, 75% of the participants had increased endurance, 80% had increased libido and sexual performance and 95% of the females reported no PMS symptoms.

As a perennial plant, Tribulus terrestris also grows outside of China, such as in India and Africa. Tribulus is mentioned in ancient Indian Ayurvedic medical texts dating back thousands of years. Tribulus has been used widely in the Ayurvedic system of medicine for the treatment of sexual dysfunction and various urinary disorders.

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.

Research on Tribulus has been studied in India and China and found to reduce the frequency of angina pectoris. Laboratory studies have found tribulus to have anti-microbial and anti-tumor potential.

Tribulus has become increasingly popular with athletes because reportedly increases strength and stamina. Studies into Tribulus uses are ongoing.