Vitamin B2 is also called riboflavin. If the human body lacks vitamin B2, it will cause angular cheilitis, cheilitis, oral ulcers, etc., while vitamin B12 can prevent pernicious anemia and prevent brain nerve damage. Under circumstances, the human body will not lack vitamin B12, and after oral ulcers occur, vitamin B2 can be supplemented, which has a certain therapeutic effect.which is better b2 or b12