Glutamine is the most abundant free form amino in muscle. Supplementing with L-Glutamine helps replenish glutamine levels for improved muscle repair, plus many other benefits; including immune system & digestive system support after physical stress. MUTANT exclusively uses only Japanese grade L-Glutamine from fermented sources. Micronized for higher solubility & uptake and it conforms to USP grade (United States Pharmacopeia) standards for safety and purity.