(commonly known as puncture vine—the bane of bicycles in areas where it grows) has a long history of traditional medical use in China, India, and Greece. It was recommended as a treatment for female infertility, impotence, and low libido in both men and women, and to aid rejuvenation after long illness.
The herb became widely known in the West when medal-winning Bulgarian Olympic athletes claimed that use of tribulus had contributed to their success.
However, current evidence suggests that it does not enhance sports performance.
Studies performed in Bulgaria are the primary source of most current health claims regarding tribulus. According to this research, tribulus increases levels of various hormones in the steroid family, including testosterone, DHEA, and estrogen, and for this reason improves
sports performance, fertility in
women, sexual function (again in men
women), and symptoms of
menopause (such as hot flashes).7-11 Unfortunately, the design of these studies appears to fall far short of modern scientific standards, and there has not been any trustworthy scientific confirmation of these supposed benefits. One well-designed study failed to find that tribulus affects male sex hormone levels in young men.17
Other studies that are far too preliminary to prove anything at all are quoted as proving that tribulus is helpful for the treatment of
diabetes, and muscle spasms, and for the prevention of kidney stones.1,13-16
A properly designed, though small, human study compared the effects of tribulus (3.21 mg per kilogram of body weight—for example, 292 mg daily for a 200-lb man) against
placebo on body composition and endurance among 15 men engaged in resistance training.3
At the end of the 8-week study, the only significant difference between the treatment and placebo groups was that the
group showed greater gains in endurance!
Another double-blind, placebo-controlled study enrolled 22 athletes and followed them for five weeks.18
The dose used in this trial was fixed at 450 mg daily for all participants. No benefits were seen.
Tribulus terrestris is usually taken at a dose ranging from about 85 to 250 mg 3 times daily with meals. Some tribulus products are standardized to provide 40% furostanol saponins and taken at a dose providing 115 mg of saponins 2 to 3 times daily.
No significant adverse effects have been noted in any of the clinical trials or human research studies of tribulus.
Animal studies performed in Bulgaria are said to have found the herb safe both in the short and long terms.9
However, it is not clear whether these studies were performed in such a way that their conclusions can be trusted.
Tribulus is known to have a toxic effect on sheep.4,5,6
Note: Women who are pregnant or nursing should not use any tribulus product. If the herb works as described, it might alter hormones in unsafe ways.
Wang B, Ma L, Liu T. 406 cases of angina pectoris in coronary heart disease treated with saponin of Tribulus terrestris [in Chinese; English abstract]
. Chung Hsi I Chieh Ho Tsa Chih.
Adimoelja A. Phytochemicals and the breakthrough of traditional herbs in the management of sexual dysfunctions [abstract].
Int J Androl. 2000;23:82-84.
Antonio J, Uelmen J, Rodriguez R, et al. The effects of Tribulus terrestris on body composition and exercise performance in resistance-trained males [abstract].
Int J Sport Nutr Exerc Metab. 2000;10:208-215.
Bourke CA, Stevens GR, Carrigan MJ. Locomotor effects in sheep of alkaloids identified in Australian Tribulus terrestris [abstract].
Aust Vet J. 1992;69:163-165.
Bourke CA. Staggers in sheep associated with the ingestion of Tribulus terrestris [abstract].
Aust Vet J. 1984;61:360-363.
Bourke CA. A novel nigrostriatal dopaminergic disorder in sheep affected by Tribulus terrestris staggers [abstract].
Res Vet Sci. 1987;43:347-350.
Kumanov F, Bozadzhieva E, Andreeva M, et al. Clinical trial of the drug "Tribestan."
Protich M, Tsvetkov D, Nalbanski B, et al. Clinical trial of the preparation Tribestan in infertile men.
Tanev G, Zarkova S. Toxicological studies on Tribestan. Cited in: Zarkova S.
Tribestan: Experimental and Clinical Investigations. Chemical Pharmaceutical Research Institute, Sofia; 1985.
Viktorov IV, Kaloyanov AL, Lilov L, et al. Clinical investigation on Tribestan in males with disorders in the sexual function.
Zarkova S. Tribestan:
Experimental and Clinical Investigations.
Chemical Pharmaceutical Research Institute, Sofia; 1983.
Adaikan PG, Gauthaman K, Prasad RN, Ng SC. Proerectile pharmacological effects of Tribulus terrestris extract on the rabbit corpus cavernosum.
Ann Acad Med Singapore.
Li M, Qu W, Chu S, et al. Effect of the decoction of Tribulus terrestris on mice gluconegensis.
Zhong Yao Cai.
Arcasoy HB, Erenmemisoglu A, Tekol Y, et al. Effect of Tribulus terrestris L. saponin mixture on some smooth muscle preparations: a preliminary study.
Boll Chim Farm.
Sangeeta D, Sidhu H, Thind SK, et al. Effect of Tribulus terrestris on oxalate metabolism in rats.
Anand R, Patnaik GK, Kulshreshtha DK, et al. Activity of certain fractions of Tribulus terrestris fruits against experimentally induced urolithiasis in rats.
Indian J Exp Biol.
Neychev VK, Mitev VI. The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men.
J Ethnopharmacol. 2005 Jun 30. [Epub ahead of print]
Rogerson S, Riches CJ, Jennings C, et al. The effect of five weeks of tribulus terrestris supplementation on muscle strength and body composition during preseason training in elite rugby league players.
J Strength Cond Res.
Last reviewed September 2014 by EBSCO CAM Review Board
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