Now get the extra glutamine you need in one delicious drink Contains only pure Ajinomoto brand LGlutamine PLUS glutamine peptides. Glutamine is an amino acid that accounts for Approx. 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 & supports healthy immune function.