Vitamin C is a water-soluble vitamin and is commonly used in the treatment of scurvy, vitamin C deficiency, and as an adjunct to the treatment of some diseases. When taking vitamin C, attention should be paid to the right symptoms and the right amount, and the drug should not be stopped suddenly after long-term use, but should be gradually reduced. The dangers of overdose of vitamin C are as follows: 1, digestive system: vitamin C is an acidic drug, overdose may stimulate the gastrointestinal mucosa, causing abdominal pain, diarrhea, nausea, vomiting, gastric ulcers and other digestive symptoms, and in serious cases, can also lead to gastrointestinal bleeding; 2, blood system: vitamin C overdose can affect the body’s anti-coagulation mechanism, platelet function is prone to disorders, prone to thrombosis, the chance of The chances of cerebral infarction will also increase; 3, urinary system: excessive intake of vitamin C can make the urinary oxalic acid and uric acid excretion disorders, resulting in increased levels of oxalic acid and uric acid in the body, which can increase the risk of gout; 4, nervous system: too much vitamin C can easily lead to neurasthenia, fatigue and tiredness; 5, other: excessive intake of vitamin C can change the body’s regulatory mechanism, accelerating the breakdown and excretion of vitamin C , once the drug is stopped can lead to withdrawal reactions, early scurvy symptoms. In addition, a large amount of vitamin C can affect the formation of osteoblasts, children during the growth period can affect bone development, the chances of bone disease will increase, but also may reduce female fertility, affecting embryonic development.