Long-term vitamin C supplementation is not recommended under normal circumstances, unless it is taken under the full guidance of a doctor. If vitamin C is supplemented blindly, it may cause related side effects, such as redness of the skin, so it is recommended to take vitamin C with caution. The reason why long-term vitamin C supplementation is not recommended under normal circumstances is that if it is taken in excess, side effects may occur and may cause harm to the body. Some patients are prone to symptoms such as red and shiny skin, diarrhea, nausea, vomiting, headache, frequent urination, and stomach cramps. Vitamin C may also cause urate stones, oxalate stones and cysteine stones if taken in large doses for a long time. In addition, during pregnancy, if an overdose of vitamin C is taken, a sudden discontinuation of the drug can lead to a rapid decline in vitamin C levels in the body, at which point it may induce scurvy in the newborn. Vitamin C is a water-soluble vitamin that is easily lost from the body, and the body itself cannot manufacture vitamin C. It needs to be taken from the daily diet, such as tomatoes, oranges and kiwis, which are rich in vitamin C. Patients with vitamin C deficiency disease can take vitamin C orally, including vitamin C granules and vitamin C tablets. If you want to take vitamin C for a long period of time, you need to take it safely under the monitoring of your doctor’s full guidance, and you also need to review it regularly at the hospital. The doctor will assess the results of treatment according to the patient’s condition, and then weigh the pros and cons and set the dosage of the medication according to the actual situation.