Vitamin B can be taken in the morning on an empty stomach, and it is a water-soluble vitamin, most of which begins to be absorbed in the stomach, and it is easier to take on an empty stomach to contact the stomach lining, increasing the area of absorption, but also elevating the absorption rate and absorption rate of the drug. Unlike fat-soluble vitamins such as vitamin A, vitamin D, in the case of fasting absorption rate is relatively low, so the clinical not recommended to take on an empty stomach. However, it should be noted that some B vitamins, such as vitamin B3, in active ulcers, it is recommended not to take; in addition, diabetes, hyperuricemia should not be taken, so pay attention to grasp the contraindications. At the same time in the daily food, cereal food shell is by the high content of B vitamins, so try to eat whole wheat flour, rice, millet, corn can be supplemented with B vitamins, which can be achieved to reduce the lack of B vitamins caused by physical disease.