Research shows that after an intense work out, glutamine levels in the body are reduced by as much as 50%. A loss of glutamine during exercise can signal protein catabolism, and muscle will start to break down to provide glutamine for other cells in your body. Supplementation with this amino acid has been shown to prevent the loss of lean muscle. When these levels are restored, muscle synthesis can return to its normal rate. It is the most abundant amino acid protein building block in the body, and is involved in more metabolic processes than any other amino acid. If you restrict carbohydrates, or are on a diet of any kind, it can help retain lean body mass while you lose fat. It is converted to glucose when you need more for energy, so it will not get robbed from your hard-earned lean muscle. One study found a huge increase in growth-hormone levels when as little as 2 grams of L-glutamine supplement was consumed! Growth hormones are known to help speed up your metabolism. For bodybuilders and athletes, boosting immunity is important since working out can deplete your glutamine stores. Becoming ill or losing lean muscle mass are signs of deficiency, affecting your performance.

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