Pure - Free Form Nitrogen Transporter Non-GMO GMP Quality Assured A Dietary Supplement Vegetarian/Vegan Kosher Glutamine is considered to be a conditionally essential amino acid, which means that under certain circumstances the body may require more Glutamine than it can produce. In the body, Glutamine functions as a major nitrogen transporter and is critical for the maintenance of healthy nitrogen balance. Glutamine also acts as the primary furl for the rapidly growing cells of immune system and GI tract. NOW L-Glutamine Powder is a pure, free-form, non-essential amino acid and is the highest grade available.