L-Glutamine participates in the synthesis of glucosamine, a component of mucosal mucin in the digestive tract, thereby promoting the repair of mucosa 56-85-9 and helping to eliminate ulcerative diseases. At the same time, it can promote brain metabolism and improve brain function through the blood-brain barrier, and like glutamate, it is an important nutrient for brain metabolism. L-Glutamine is widely present in nature, such as in free form in pumpkin and sunflower seedlings, and its N-ethyl compound (theanine) is also present in tea. Although it can be obtained from natural products, fermentation and synthesis methods are mainly used in production.