Glutamine is 1 of 20 naturally occurring amino acids and is the building block of protein. L-Glutamine is involved in many metabolic processes, including the synthesis & protection of muscle tissue, production of glycogen, and immune support during periods of immune and muscular stress. Metabolic Nutrition provides a pharmaceutical grade, class-leading 5,000 mg of the purest form of L-Glutamine, specifically developed for individuals who want to maximize their health and wellness.