Increases Muscle Recovery. Improves Growth Hormone Levels. Supports GI & Immune Health. Glutamine is the most abundant free amino acid in muscle tissue. It helps support muscle growth and also provides energy for the entire body, including important metabolic functions. It is produced by the body under normal conditions; however, during periods of stress or intense exercise, our demand increases. Supplementing with L-Glutamine after workouts may aid in muscle tissue repair, enhance immune functions, and assist in recovery and recuperation.