GNC Beyond Raw Chemistry Labs L-Glutamine is a lab-grade dietary supplement that provides 5 grams of L-Glutamine per serving. This amino acid plays a crucial role in muscle function during and after exercise, supporting muscle growth and nitrogen balance in the body. Intense exercise can deplete muscle glutamine stores, making supplementation important. This product is gluten-free and mixes well with water, fruit juice, or sports drinks. It is ideal for fueling muscles and supporting protein synthesis before and after workouts.