Glutamine is a popular dietary supplement consumed for purported ergogenic benefits of increased strength, quicker recovery, decreased frequency of respiratory infections, and prevention of overtraining. From a biochemical standpoint, glutamine does play a physiologic role in each of these areas, but it remains only one of a host of factors involved. This review examines the effects of glutamine on exercise and demonstrates a lack of evidence for definitive positive ergogenic benefits as a result of glutamine supplementation.
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Phillips, G.C. Glutamine: The nonessential amino acid for performance enhancement. Curr Sports Med Rep 6, 265–268 (2007). https://doi.org/10.1007/s11932-007-0043-6