Glutamine is an important amino acid that plays a role in the health of our digestive tract and muscle cells, amongst other functions. Heavy exercise, infection, and trauma can deplete our body’s glutamine reserves that sustain our muscles. Adequate glutamine levels keep our muscles from wasting. Glutamine acts as fuel for the cells that line the intestines, keeping our GI tract healthy. It is important for keeping the stomach lining as well as the intestinal lining intact. It plays a role in the formation of GABA, an important neurotransmitter, thus promoting proper brain function and mental activity. Adequate intake of glutamine supports good mental function.