Glutamine is the most abundant naturally occurring non-essential amino acid in the human body and one of the only amino acids capable of directly crossing the blood-brain barrier. It can be found circulating in the blood as well as stored in the skeletal muscles. Even though it is officially classified as ''non-essential'' there are some authorities who believe it becomes conditionally essential in states of illness injury or physical stress (such as that induced by heavy exercising). Higher intake of glutamine from food or supplements is usually encouraged during these states.Other products from HerbsPro