If the body is deficient in vitamins, supplementation is carried out, which has a therapeutic effect on the organism and the disease; however, it is not recommended to overdose on vitamins when there is no deficiency of vitamins, and overdose of vitamins is not conducive to the health of the organism. As vitamins are important substances for maintaining all physiological activities of the organism, they are indispensable and important substances for the human body. Eating vitamins can replenish the vitamins needed by the organism, such as vitamin A, vitamin B, vitamin C, vitamin D and so on. Among them, vitamin A can promote the production of retinal photoreceptors to a certain extent, which can play a role in relieving visual fatigue. And B vitamins can maintain the normal function of muscle tissue and so on. Vitamins can promote collagen synthesis, maintain the elasticity of capillaries and inhibit cell oxidation. Vitamin C can help improve the absorption and utilization of iron, folic acid and other substances, and at the same time, to a certain extent, can relieve the pressure on the capillary wall and protect the arterial blood vessels. Vitamin D can promote the absorption of calcium in the small intestine. As food also contains more vitamins, if the food can not replenish the more adequate vitamins due to factors such as partiality, eating less and so on. When uncomfortable symptoms occur, you need to go to the hospital in time and take vitamin preparations under the guidance of the doctor for supplementation.