Extra Strength Nitrogen Transporter Non-GMO A Dietary Supplement Vegetarian/Vegan GMP Quality Assured 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 fuel for rapidly growing cells of the immune system and GI tract. This product has three times the L-Glutamine (1,500 mg per tablet) as in our regular strength product (500 mg per capsule). This product contains Pharmaceutical Grade L-Glutamine.