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"Glutamine is an amino acid that has been receiving a great deal of attention. Many researchers are studying glutamine’s affect on performance, lean mass and immune function. Many athletes are taking this supplement with hopes of improved resistance to colds and other illnesses, as well as increasing their muscle mass and energy levels. Glutamine is found in skeletal muscle and the blood, and is the primary fuel source for the intestinal tract and immune system. It also plays a role in muscle glycogen replenishment following exercise. Glutamine is considered a non-essential amino acid. That means the body can manufacture it, and dietary intake of glutamine is not essential. However, recent research indicates that when the body is under severe stress, the amount of glutamine manufactured by the body may not be enough to meet body demands. At these times, dietary sources of glutamine may become important. Since glutamine is an amino acid, high protein foods contain glutamine. Animal products (especially meat) are the richest food sources of glutamine. A three-ounce portion of meat, chicken or fish contains about three to four grams of glutamine. Glutamine supplements have recently become popular, and overall, appear relatively harmless. However, high doses of any single amino acid can affect the absorption of other amino acids. Any amino acid supplements should be taken several hours before or after meals to avoid interfering with the absorption of other nutrients. Whether these supplements provide any benefit is questionable. Individuals with an adequate dietary intake of protein will probably reap little if any benefit from glutamine supplementation."