L-Glutamin 500 mg, supplied by Douglas Laboratories, contains 500 mg of pure L-glutamine (USP).
The amino acid glutamine plays a key role in the metabolism, structure and function of the entire gastrointestinal (GI) tract and the immune system.
Glutamine is the most abundant amino acid in the blood, and is a vehicle for the transport of nitrogen.
In lung, muscle and other tissues, glutamine is formed from glutamic acid and ammonia by breaking down the amino acid.
The gastrointestinal tract, liver, and the immune system use glutamine for the synthesis of nucleotides, proteins, amino acids and sugars.
Glutamine carries potentially toxic ammonia to the kidneys for excretion, which helps maintain normal acid-base balance.

Many clinical studies support the fact that the presence of glutamine in the diet is crucial for maintaining the normal function of the entire gastrointestinal tract, including the liver and pancreas. Glutamine also helps to maintain normal intestinal permeability, cell regeneration of the mucosa and its structure, especially during periods of physiological stress. Intestinal mucosa cells need glutamine as a nitrogen donor for the synthesis of a number of important compounds, including the nucleotides needed for cell division, and amino sugars for the construction of intestinal mucosal glycosaminoglycans.