Usually, vitamins should not be used in excess. If vitamins are used in excess, it will cause dysfunction of the digestive system, as vitamins are acidic substances, and if they are used in excess, it will cause dysfunction of the absorption of the gastrointestinal tract, thus causing acid reflux, heartburn, nausea and vomiting in the gastrointestinal tract, and in severe cases, it will also cause irregular stools or mucus-purulent stools, thin stools, etc. In addition, vitamin supplementation will also cause the liver and kidneys to increase the burden and load, because vitamins are mainly decomposed and digested by the liver and excreted by the kidneys. If vitamin supplementation is excessive, it will lead to more work for the liver and more work for the glomerulus and renal tubules of the kidneys, and long-term vitamin supplementation will cause chronic liver and kidney dysfunction.