Safe vs effective: Tribulus has been used safely in 8 week studies, but it didn't seem to enhance body composition or athletic performance. The effects of longer term use are unknown. http://www.ncbi.nlm.nih.gov/pubmed/10861339?dopt=abstract so, the question might be whether you want to spend your money on that, vs a better coach for your training. Or, maybe more sessions with the coach you already have. :-).
Answered 12/10/2013
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