Although classed as a non-essential amino acid, the demands placed on an athlete's body often far outstrips the body's ability to produce enough L-Glutamine. Post weight training certain parts of the body may demand so much Glutamine that the body can't manufacture enough which in turn shall induce catabolism or muscle breakdown. When this happens Glutamine supplementation can make a world of difference. Given this, supplementation is a convenient way to meet these demands. Studies have shown this type of Glutamine supplementation can prevent muscle wasting, as it produces a potent anti-catabolic effect.
However, it is not only athletes who benefit from L-Glutamine as increasing studies show the use of L-Glutamine for immune function make this supplement suitable for anyone putting stress on their system. In European hospitals, this amino acid is treated like a drug. It's routinely administered to patients suffering from trauma or stress such as surgery, burns etc.