Because vitamins are essential nutrients and have important physiological functions, some people think that eating more vitamins is better, which is not only wrong, but also very dangerous! Vitamins can be divided into water-soluble and fat-soluble. When fat-soluble vitamins such as vitamin A and vitamin D are taken in too much, they can't be excreted directly by urine, which is easy to accumulate in the body and cause poisoning. If a large amount of vitamin A is taken orally for a long time, poisoning symptoms such as bone decalcification, joint pain, dry skin, loss of appetite and hepatosplenomegaly may occur. Long-term oral vitamin D can lead to hypercalcemia, anorexia, nausea, vomiting, diffuse muscle weakness, muscle pain and so on. As for water-soluble vitamins, although they can be excreted from urine after eating more, they are less toxic, but they can still damage human organs when taken in large quantities. If a large dose of vitamin C is taken, it may stimulate the gastric mucosa to bleed together. In addition, long-term overdose of vitamins can reduce the absorption rate of vitamins in food, and once it is stopped, it will lead to symptoms of vitamin deficiency. Therefore, long-term overdose of vitamins is not a scientific practice. The dosage taken by normal people, including vitamins in food, can reach the amount stipulated in China's dietary standards.