L-Citrulline has many important physiological functions, such as scavenging free radicals, allogeneic rejection indicator, Vasodilation, stabilizing blood pressure, diagnosing rheumatoid arthritis, antioxidant, etc; In addition, it has a very significant effect on restoring energy and improving the body's immune system. In recent years, L-neneneba citrulline has attracted more and more attention in the fields of food, cosmetics and medicine, and has a broad prospect of development and application.