Now Foods Supplements, L-Glutamine 500 mg 120 Veg CapsulesBrand: NOW Color: White Features: Amino acid supports immune function: 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 that case, supplementing with glutamine may help with recovery of the amino acid in the body. Nitrogen transporter: In the body, glutamine functions as a major nitrogen transporter and is critical for the