Vitamin C tablets follow the doctor’s instructions for short-term use is generally not harmful to the human body, if long-term, overdose may cause discontinuation of scurvy, stones and other adverse reactions, need to follow the doctor’s instructions for medication. The human body if the long-term use of daily 2 ~ 3g vitamin C tablets, can cause scurvy after stopping the drug. Long-term, large amounts of vitamin C tablets may cause cysteine salt, urate, oxalate stones. The daily dosage of more than 1g in humans can cause headache, diarrhea, vomiting, nausea, stomach cramps and other adverse reactions. Vitamin C tablets need to be used under the guidance of a doctor, and should not be used arbitrarily to avoid serious consequences. In the process of use, if there is an adverse reaction, you should stop taking the medicine and seek medical attention.