Fuel For Workout GMP - Good Manufacturing Practice Product Supports Recovery Form workouts Supports Muscle Tissue and Immune Function Dietary Supplement L-Glutamine is the most abundant free amino acid found in the body, comprising more than 60% of the free amino acid pool in skeletal muscle and greater than 20% of total circulating amino acids. It is involved in many metabolic processes, including the synthesis and protection of muscles tissue, the production of glycogen, and immune support during periods of immune and muscular stress. L-Glutamine is also a major fuel source of enterocytes (intestinal cells) and brain cells. Supports healthy immune function. Supports muscle mass. Supports the integrity of the intestinal lining. Supports proper mental function.