Glutamine is one of the 20 amino acids which are required to the human body. It is not essential amino acid, but it may become conditionally essential in certain situations, such as a hard workout or digestive disorders. Many natural foods contain glutamine in smaller or larger amounts. It is interesting that about 61% of the mass of muscle is composed of glutamine.
Functions and performance
Although known as a supplement that helps in building muscle, glutamine has many other functions. Some of them are the control of the pH value in the kidneys and temporarily reduction of growth hormone in the blood. Glutamine is also the energy source for the cells, in addition to glucose, off course.
Does it really help in building muscle?
The answer is: very little. Although it is constantly promoted as a supplement for bodybuilding, the fact is that there are many other supplements that are more effective (like whey protein, creatine or BCAA). Scientific studies have shown that glutamine supplementation has no effect on the strength during training or in prevention of the degradation of muscle in healthy individuals. The only benefit of glutamine in the muscles could be that it slightly increases growth hormone by stimulating the thyroid gland.
Glutamine shows its best side in the critical states of illness or overtraining. It is used for burn patients and for faster recovery in patients suffering from AIDS. Also, it can be used for maintaining weight and as a help for people suffering from ulcerative colitis.
Athletes who have the most benefits from the use of glutamine are marathon runners and others who deal with extensive endurance sports. It has been shown that glutamine supports the immune system in people who are involved in sports such as the marathon or cycling in the long run. This is because of the loss of glutamine in such long-term, extreme efforts.
It should be noted that glutamine increases the level of bicarbonate in the blood. That means that it should reduce the influence of lactic acid in the muscles, which would allow you to exercise longer.
Food sources
Glutamine is found in beef, chicken, fish, eggs, milk, wheat, cabbage, beans, spinach and parsley.
When and how to take glutamine?
If you decide to use glutamine, take 5 grams on an empty stomach with water, because this is the best way of feeding cells of the intestine. Glutamine helps in restoring mucosal barrier in the gut.
The best time to take glutamine is before bedtime. Various studies have shown that glutamine raises levels of growth hormone, and sleep is the time when your body is recovering and growing.
People who work very hard and have a long trainings can benefit by taking glutamine after exercise to keep their immune system resistant.
Glutamine has no unintended consequences, even if you take doses up to 40 grams per day. However, like any other protein, it can overload your kidneys if you take it with too little liquid.