The Road to Big Muscles Starts Here GNC Pro Performance L-Glutamine is a supplement that aids muscle recovery and boosts immunity. It provides 5,000 mg of L-glutamine per serving—a non-essential amino acid naturally found in muscle tissues. Faster Muscle Recovery GNC L-Glutamine helps maintain depleted levels during intense exercise, aiding muscle recovery and reducing soreness. Stronger Immunity, Faster Recovery! L-glutamine serves as a key fuel source for immune cells, supporting a healthy immune system, especially during periods of physical stress. Support Your Gut, Fuel Your Health! It plays a significant role in preserving the integrity of the intestinal mucosa, as well as supporting digestion and nutrient absorption