Glutamine is an important amino acid formed by the body and obtained through various diets. It is formed in the lungs and mainly stored in the muscles of the body. Many immunity cells rely on glutamine for energy. It removes excess ammonia from the body and is required for normal functioning of the brain and digestion. Glutamine levels are reduced by certain medical conditions, such as injuries, surgery, stress and infections. Thus reduction in levels of glutamine slows the healing process. For people who exercise a lot, glutamine supplements may be used for recovery of over stressed muscles. Proteins from plants and animals like milk, yogurt, cottage cheese, pork and poultry, beef, ricotta cheese, raw parsley, cabbage, raw spinach, etc are an excellent source of Glutamine.