Ahmadi AR, et al. - Researchers attempted to determine the impacts of glutamine supplementation on athletic performance, body composition and athletics immune system through a systematic review and meta-analysis. A total of forty-seven studies were involved in the systematic review, and twenty-five trials matched the inclusion criteria for the meta-analysis. They reported that glutamine supplementation had no effect on athletics immune system, aerobic performance, and body composition, however, glutamine resulted in greater weight reduction. They suggested that the efficacy of glutamine supplementation on neutrophil numbers could be affected by supplement type and dose.