L-Glutamine PowderFree amino acid powder. Glutamine is the most abundant free amino acid in the body, making up approximately 40 60% of the total amino acid pool in tissues. It is necessary to perform a variety of essential functions, as it is a necessary substrate for protein synthesis, hepatic ureogenesis, and hepatic and renal gluconeogenesis. It also acts as an anabolic precursor in muscle growth, as a buffer for acid base balance in the kidneys, as an oxidizing