During prolonged exercise, an athlete may experience low glutamine levels. Glutamine (L-glutamine) is the most abundant amino acid in the body, serving as a source of cellular energy in muscle, gut and immune cells. Providing 5,000 mg of glutamine per serving, Klean Glutamine works to maintain gut health as well as support immune health and recovery. Push your body to its limits without taking a toll on your g.i. tract and immune system.^‡