L-Glutamine is a key amino acid that plays a role in providing structure and energy for the cells of the GI tract. Many factors deplete the availability of L-Glutamine making the supplemental form necessary. Key for muscle and GI function, L-Glutamine is a primary energy source for intestinal immune cells and a major amino in muscle tissue. The body’s ability to produce adequate amounts may be compromised during physiological stress, thus warranting supplementation.