L-glutamine, an amino acid that the body makes, is predominantly found in the muscles and the lungs. It works to remove a waste product called ammonia from the body. In addition, L-glutamine supports immune, brain and digestive function. People with lower glutamine levels due to surgery, injury, stress or infection may take it as a supplement to maintain healthy levels. Seroyal offers a natural supplement called Genestra Brands Amino L-Glutamine that provides an appropriate amount of this amino acid in a convenient capsule format.