Vitamin B2 is one of the B vitamins and is one of the essential vitamins in the body. It is a water-soluble vitamin, also known as riboflavin, and is widely distributed in the body. It is a water-soluble vitamin, also known as riboflavin, and is widely distributed in the body. Vitamin B2 is mainly used to treat oral diseases, and also has the function of preventing and treating local mucous membrane breakage, and can be applied and taken for the treatment of corns and mouth ulcers and other local mucous membrane breakage. Vitamin B2 precautions are that people with renal insufficiency are not allowed to take vitamin B2. After taking vitamin B2 medication, one should not drink excessive amount of wine, as wine will cause chemical reaction with vitamin B2, which will produce violent irritation symptoms to human gastrointestinal tract.