Glutamine

Glutamine is an amino acid, one of the building blocks of protein. It is naturally found in the body and in many foods, especially protein-rich ones like meat, fish, eggs, and dairy. It can also be produced industrially through fermentation.

Glutamine is often added to foods and supplements to support muscle recovery and growth, particularly in sports nutrition products. It is also used in some specialized medical foods and beverages.

In the U.S., glutamine is generally recognized as safe (GRAS) when used as a nutrient. The body naturally produces glutamine, and it plays a role in various bodily functions. International bodies like JECFA have evaluated glutamine. Evidence on its specific health benefits at typical dietary intakes is ongoing, with some studies suggesting roles in gut health and immune function, while others show no significant effect.