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TribulusFrom Cathy Wong,Your Guide to Alternative Medicine. FREE Newsletter. Sign Up Now! What is Tribulus?Other Names: Puncture vineTribulus terrestris is a herb that has been used in the traditional medicine of China and India for centuries. It was only in the mid-'90s when Eastern European Olympic athletes claimed that tribulus contributed to their success that tribulus became known in the North America. The active compounds in tribulus are steroidal saponins, mainly furostanol glycosides but also spirostanol glycosides. These saponins are found primarily in the leaf.
Why Do People Use Tribulus?Tribulus is most often used for infertility, erectile dysfunction, and low libido. In the last decade, it has become popular to improve sports performance.Tribulus has become increasingly used for these conditions because research performed in Bulgaria and Russia indicates that tribulus increases levels of testosterone (by increasing luteinizing hormone), DHEA, and estrogen. zSB(3,3) However, the design of these research studies has been questioned. A recent study found that 4 weeks of tribulus supplements (at 10-20 mg per kg body weight daily) did not affect male sex hormones testosterone, androstenedione, or luteinizing hormone compared to controls. Erectile dysfunction Preliminary animal studies have found that tribulus heightened sexual behaviour and increased intracavernous pressure. This was attributed to increases in testosterone. Body Composition and Exercise Performance Although tribulus has become popular as a sports performance aid, one small but well-designed study found it has no effect on body composition or exercise performance. Fifteen subjects were randomly assigned to tribulus (3.21 mg per kg body weight daily) or placebo. After 8 weeks with resistance training, there were no changes in body weight, percentage fat, dietary intake, or mood in either group. What was surprising was that muscle endurance improved more in the placebo group! Muscle endurance (determined by the maximum number of repetitions at 100-200% of body weight) increased for the bench and leg presses in the placebo group. The tribulus group experienced an increase in leg press strength only.
DosageTribulus terrestris is often taken at a dose between 85 to 250 mg three times daily, with meals.
SafetyPregnant or nursing women should not use tribulus.Tribulus terrestris has a toxic effect in sheep. It has been found to induce a chronic, progressive, irreversible disorder in the dopamine circuits of the nigrostriatal complex in the brain, resulting in impaired muscle function and weakness in the hindquarters, eventually leading to death. An increase in breast size (called gynaecomastia) in a young male weight trainer was reported after he took a herbal tablet containing tribulus. Articles about vitamins Vitamin B6
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