Glutamine is one of the most versatile of all amino acids, and among the top aminos used by elite athletes. Among its many functions, supports protein synthesis and protein degradation, functions as a nitrogen precursor and transfer, supports cellular hydration, supports growth hormone production, maintains acid balance, supports the immune system, is an energy precursor and supports glycogen production in the liver. In short, glutamine is both anabolic and anti-catabolic. Glutamine accounts for about 60% of the body´s total intramuscular free amino-acid pool and 20% of the total circulating amino acids. Unlike almost all other aminos, glutamine contains two nitrogen atoms. Because of this additional nitrogen atom, glutamine is called a nitrogen shuttle. Glutamine transports nitrogen where the body needs it most. Glutamine is available in both powder and capsule forms.