Glutamine is a Nonessential Amino acid and a fundamental organic molecule for the body’s function. It is responsible for Protein synthesis, it helps build muscles, tendons, cartilage, nails and Hormones. Glutamine is more abundant in muscle tissue but it acts as an energy nutrient for immune cells. There are two different forms of this amino acid: L-glutamine and D-glutamine, with L-glutamine being the most common form found in foods and supplements, while D-glutamine does not seem to matter much to the body.