L-glutamine is an amino acid that participates in protein synthesis, as well as in the synthesis of other amino acids. Acts as a source of energy, helps to suppress catabolism, reduce cortisol levels and strengthen immunity. L-Glutamine is useful for people who lead an active lifestyle, or experience heavy loads during the day. L-Glutamine also helps to accelerate recovery after injuries and illnesses. How to take Glutamine Adults take 1 capsule 2 times a day with meals.