danmirage
Posts: 6023
Joined: 11/20/2005
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Better to do the things that actually work. But to answer...
tribulus terrestris
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 they claim it improves sports performance, fertility in in men and women, sexual function (again in men and women), and symptoms of menopause (such as hot flashes). 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.
The best designed and most recent human study compared the effects of tribulus against fake treatment (placebo) on body composition and endurance among 15 men engaged in resistance training. At the end of the 8-week study, the only significant difference between the treatment and placebo groups was that the placebo group showed greater gains in endurance!
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.
The one well designed study failed to find that tribulus affects male sex hormone levels in young men:
Neychev VK, Mitev VI. The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men. J Ethnopharmacol. 2005 Jun 30.
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.
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http://www.discussbodybuilding.com/m_158705/mpage_2/tm.htm
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http://www.discussbodybuilding.com/m_111173/mpage_1/tm.htm
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http://www.discussbodybuilding.com/m_111175/mpage_1/tm.htm
(in reply to ebbearsfb1)
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