L-Glutamine is a major fuel source for intestinal, immune and brain cells. It also comprises nearly 60% of the body's total amino acid muscle pool. L-Glutamine regulates nitrogen transport to and from muscle tissue, thereby promoting amino acid balance. L-Glutamine is the most abundant free amino acid in the body and is found in large amounts in skeletal muscle. Glutamine is required for protein synthesis in skeletal muscle and is heavily metabolized during intense exercise.