Dietary Supplement. 1,000 mg of Pure L-Glutamine per capsule. Glutamine is the most abundant amino acid 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. Optimum Nutrition's Glutamine 1000 Caps are formulated for rapid disintegration and maximum absorption. Each capsule provides 1,000 mg (1 g) of pure L-Glutamine. Optimum Nutrition's Glutamine 1000 Caps are processed and packaged in our own state-of-the-art manufacturing facility. Optimum Nutrition is approved to manufacture Over-the-Counter (OTC) pharmaceuticals and operates in accordance with current Good Manufacturing Practices (cGMP's).