L-Glutamine

Studies have found L-glutamine to have no adverse side effects, and also because L-glutamine naturally occurs in your body, it has no health risks. In fact, glutamine as part of the body's proteins is the amino acid found in greatest amount. However, like all supplements, too much is never a good idea. Taking excessive amounts of L-Glutamine has led to upset stomachs, so you should follow the recommended dosages.
Glutamine is a carbon and nitrogen donor and helps restore glycogen which restores energy. Glutamine is the most important component of muscle protein, and helps repair and build muscle.
Glutamine has been linked to protein synthesis. It prevents your muscle from being catabolised (broken down) in order to provide Glutamine for other cells in the body.
Glutamine helps maintain cell volume and hydration, speeding up wound and burn healing and recovery.
Glutamine benefits you by replenishing declining Glutamine levels during intense workouts.
Research has shown Glutamine can help increase growth hormone levels. A study has shown 2 grams of L-Glutamine daily increased growth hormone by over 400%.
Glutamine may serve to boost your immune system. For bodybuilders and athletes, this is important since heavy workouts tend to greatly deplete Glutamine levels. (It's well known among long-distance runners that after a race you are much more likely to get ill.)
Glutamine is one of the most important nutrients for your intestines. It has the ability to 'repair a leaky gut' by maintaining the structural integrity of the bowels.
Studies have found that 1.6 grams of Glutamine a day had a 92% cure rate of ulcers in 4 weeks.
L-Glutamine is also one of the three amino acids that go to make up L-glutathione, the main antioxidant and detoxifying enzyme in the liver.
Glutamine is important for bodybuilders and athletes to help prevent catabolism, but it's also important for others with all the benefits it provides, and no side effects.