Vitamins can be divided into water soluble and fat soluble. When vitamin A, vitamin D and other fat-soluble vitamins are ingested too much, they cannot be excreted directly through urine, which is easy to accumulate in the body and cause poisoning. If you take a large amount of vitamin A orally for a long time, there will be poisoning symptoms such as decalcification of bones, joint pain, dry skin, loss of appetite and hepatosplenomegaly. Long-term oral administration of vitamin D can lead to hypercalcemia, anorexia, nausea, vomiting, diffuse muscle weakness and muscle pain. As for water-soluble vitamins, although they can be excreted from the urine after eating too much, they are less toxic, but a large amount of intake will still damage human organs. If you take a large dose of vitamin C, it may stimulate the gastric mucosa to bleed together.