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BMC Cancer (2009) 9:372
Michael Gleeson, Dosing and Efficacy of Glutamine Supplementation in Human Exercise and Sport Training, The Journal of Nutrition, Volume 138, Issue 10, October 2008, Pages 2045S2049S, Perna S, Alalwan TA, Alaali Z, Alnashaba T, Gasparri C, Infantino V, Hammad L, Riva A, Petrangolini G, Allegrini P, Rondanelli M
This is because zinc is involved in the production of testosterone
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