Review ArticleAmino acid supplements to improve athletic performanceWagenmakers, Anton J.M.Author Information Correspondence to Anton J.M. Wagenmakers, Department of Human Biology and Stable Isotope Research Centre, Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Maastricht University, PO Box 616, 6200 MD Maastricht, the Netherlands. Tel: +31 43 3881502; fax: +31 43 3670976; e-mail: [email protected] Abbreviations BCAA: branched-chain amino acids FFA: free fatty acids Current Opinion in Clinical Nutrition and Metabolic Care: November 1999 - Volume 2 - Issue 6 - p 539-544 Buy Abstract This review provides a critical evaluation of the metabolic rationale for the use of individual amino acids as nutritional ergogenic (work-generating) aids in athletes. The conclusion is that in contrast to the claims made on sport nutrition products, branched-chain amino acids do not improve endurance performance, that the evidence that glutamine supplements may improve immune function is rather weak, and that the available commercial supplements contain too little arginine to increase growth hormone levels. No studies have been performed to investigate the claim that tyrosine supplements can improve explosive exercise. © 1999 Lippincott Williams & Wilkins, Inc.