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Glutamine is a conditionally essential amino acid that plays a variety of roles within the body. Not only does it help improve nitrogen retention and protein synthesis, but also helps maintain a healthy immune system and digestive health. RSP Nutrition Glutamine works to benefit lean muscle and overall health. The essential amino acid, L-Glutamine, plays a critical role in supporting lean muscle, as well as certain functions in the body such as digestion and the immune system. This pure glutamine formula is gluten free, GMO free and banned substance free. Additionally, it is micronized for maximal absorption, and will mix effortlessly into your favorite beverage.