QUOTE:
Supplementation with tribulus does not enhance body composition or exercise performance in resistance-trained males.
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http://www.ncbi.nlm.nih.gov/pubmed/10861339 QUOTE:
These data provide evidence that the addition of these herbal extracts to androstenedione does not result in increased serum testosterone concentrations, reduce the estrogenic effect of androstenedione, and does not augment the adaptations to resistance training.
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http://www.ncbi.nlm.nih.gov/pubmed/10997957 QUOTE:
The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men.
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http://www.ncbi.nlm.nih.gov/pubmed/15994038 QUOTE:
No between-group differences were noted in the urinary T/E ratio. It was concluded that T. terrestris did not produce the large gains in strength or lean muscle mass that many manufacturers claim can be experienced within 5-28 days.
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http://www.ncbi.nlm.nih.gov/pubmed/17530942