100% Lab tested pure. Labrada Glutamine 500 contains only pure pharmaceutical grade L-glutamine. Glutamine is an amino acid that accounts for approximately 60% of all free amino acids in the body. Muscle tissue contains especially high concentrations of glutamine. Insufficient glutamine in the diet has been associated with muscle tissue breakdown. Supplemental glutamine can help avoid muscle tissue breakdown, increase protein synthesis, increase glycogen storage (energy stores) in muscle, and can support healthy immune function. 100% Lab Test Pure. Contains 100% contaminant-free L-glutamine. This statement has not been evaluated by the Food and Drug administration. This product is not intended to diagnose, treat, cure or prevent any disease. If it"s on the label, it"s in the bottle! This product is independent lab assayed for purity. Lee Labrador"s quality guarantee.