Vitamins are divided into water-soluble vitamins and fat-soluble vitamins, different vitamins take time is not the same, if the water-soluble vitamins when to take can, if the fat-soluble vitamins after meals to take better. 1 water-soluble vitamins: such as vitamin B1, vitamin C, vitamin B2, etc. Recommended before meals on an empty stomach, or take after meals are available, at any time to take, does not affect the absorption of vitamins, but also does not interact with food, affecting the efficacy of the drug. 2. fat-soluble vitamins: such as vitamin A, vitamin D, vitamin E, etc. It is better to take after meals. Because food is rich in fatty acids of plant or animal origin, it can effectively dissolve the vitamins and enhance the absorption of the drug. It is recommended to take under the guidance of a physician.