Jarrow Formulas L-Glutamine is manufactured by microbial fermentation. L-Glutamine is the most abundant amino acid in the human body and is involved in many metabolic processes, including the synthesis and protection of muscle tissue, the production of glycogen, and provides immune support during periods of immune and muscular stress.(1) L-Glutamine also supports the integrity of the intestinal lining.(1) This dietary supplement is IGEN non-GMO tested and is gluten-free. Adults take one of these veggie capsules one to two times a day, preferably on an empty stomach or after a workout, or as directed by your qualified healthcare professional. Jarrow Formulas - Superior Science. Smarter Formulas. (1)These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.