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Yukirin
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2129161/
"Brilla and Conte [13] reported that ZMA supplementation significantly increased free testosterone, IGF-1, and isokinetic strength gains during training. Results of this study do not support these findings."
"ZMA supplementation had no significant effects on total and free testosterone,"
"no significant effects were observed between groups in changes in 1-RM strength, upper or lower body muscle endurance, or anaerobic sprint capacity."