For 65 years, Douglas Laboratories has been dedicated to meeting the needs of healthcare professionals. As a globally recognized leader in the development of innovative, science-based nutritional supplements, we strive to help healthcare professionals and their patients push their potential for healthy living, today and in the future.*. Our uncompromising operational practices at our state-of-the-art manufacturing facilities surpass GMP standards and manufacturing regulations. All of our products are GMO-free. Vitamins/Minerals/Amino Acids: Our vitamins/minerals and amino acid formulas are developed to provide beneficial support in filling nutrient gaps.*. Gastrointestinal Support: Many clinical studies support that endogenous glutamine is crucial in maintaining normal function of the entire gastrointestinal tract, including the liver and pancreas.*. Immune Health: The amino acid glutamine plays a key role in the metabolism, structure, and function of the entire healthy gastrointestinal (GI) tract and its extensive immune system.*.