Vitamin B2 should not be taken for a long time. Vitamin B2, also known as riboflavin, is one of the substances that promote the key of redox in the body and plays a great role in the body, which can effectively prevent migraine and coronary heart disease, as well as prevent the occurrence of cancer. In case of deficiency, children may develop keratitis, tongue inflammation, conjunctivitis, stomatitis and dry skin. However, because vitamin B2 is after all a drug, it should not be used for a long time, and the recommended maximum daily intake should not exceed 1.7 mg. If too much is consumed, it may affect various manifestations such as itching, numbness, burning sensation and tingling of the skin, so it is not recommended to take vitamin B2 for a long time.