Glutamine is the most abundant single amino acid in the blood and in the intracellular free amino acid pool (most abundant amino acid in muscle tissue). It comprises 61% of the amino acid pool in skeletal muscle. Glutamine’s unique structure, containing two nitrogen side chains, consists of 19% nitrogen - making it the primary transporter of nitrogen into the muscle cell. In fact, glutamine alone is responsible for 35% of the nitrogen that gets into the muscle cell. Glutamine literally drives muscle building nitrogen into the muscle cell where it is synthesized for growth.
So if you don't satisfy your body's glutamine demand either through the food you eat or from supplementation, it will ravage it from muscle tissue causing a loss of lean muscle mass. One other unique quality glutamine exerts is its ability to dramatically increase circulating growth hormone levels.
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