The most relevant glutamine producing tissue is muscle mass. About 90% of all glutamine synthesized in the body is by muscle. Glutamine is also released, in small amounts, by the brain and lungs, although the liver is capable of glutamine synthesis, its role in glutamine metabolism is more regulatory.
The amino acid L-Glutamine is extremely popular and is found in protein powders, meat, beans, fish, poultry, dairy products, and of course supplements.
Sports Enthusiast and Body Builders use a lot of their glutamine when working out and can particularly gain from the intake of glutamine supplements. Also good to know; the immune system relies heavily on this amino acid.
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Other Information:
Aiding recovery in catabolic states of injury and illness, glutamine becomes conditionally-essential requiring intake from food or supplements. Glutamine has been studied extensively over the past 10–15 years and has been shown to be useful in treatment of serious illnesses, injury, trauma, burns, and treatment-related side-effects of cancer as well as in wound healing for postoperative patients.
Glutamine is also used as a supplement for muscle growth in weightlifting, bodybuilding, endurance, and other sports. Evidence indicates that glutamine when orally loaded increases plasma HGH levels by stimulating the anterior pituitary gland. In biological research, L-glutamine is commonly added to the media.
Glutamine enriched diets have been linked with intestinal effects including maintenance of gut barrier function and cell differentiation. This may relate to the fact that the intestinal extraction rate of glutamine is higher than that for other amino acids
Reference Wiki: http://en.wikipedia.org/wiki/Glutamine