L-Glutamine is the most common conditionally essential amino acid in the human body. It helps with recovery of the organism and protects the muscle tissue from catabolism (disintegration). Other effects are stimulation of growth hormone, improvement of the immune system and protein synthesis. L-Glutamine is contained mainly in animal products, but not in sufficient concentration in order to achieve the mentioned effects. The easiest way to supply with enough amount of it is through supplementation. L-Glutamine is of significant importance for weight loss programs, which purpose is to protect muscle mass, as well as for programs designed to build muscle mass.