Glutamine Drink Mix contains only pure AjinomotoTM brand pharmaceutical grade L-Glutamine PLUS glutamine peptides. Glutamine is an amino acid that accounts for approximately 60% of all free amino acids in the body. Muscle Tissue contains especially high concentrations of glutamine.Supplemental glutamine can help prevent muscle tissue breakdown, increase protein synthesis, increase glycogen storage (energy stores) in muscle, and supports healthy immune function.