Now L-Glutamine 1000 mg Veg Capsules contains 1,000 mg glutamine, which 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 the rapidly growing cells of the immune system and GI tract. This double strength product has twice the L-Glutamine (1,000 mg per capsule) as in regular strength product (500 mg per capsule).