Applied Nutrition L-Glutamine Powder Micronized . Glutamine is one of the most abundant amino acids in muscle tissue and is naturally found in proteins and is classified as a semi-essential or essential amino acid. Its most important functions include muscle recovery after exercise, reducing muscle breakdown, increasing endurance and improving immune function. And the side effects associated with chemotherapy such as diarrhea, mucositis, nerve pain or neuropathy to improve the recovery process from intestinal surgery, or bone marrow transplant, and reduce the risk of infection in some patients because it is their main source of energy. immune cells