Vitamin C tablets as a preventive medicine can be taken at any time, as a therapeutic medicine, adults should follow the doctor’s instructions to take. Vitamin C tablets can supplement vitamin C for the body, for the prevention of scurvy, all kinds of acute and chronic infectious diseases and purpura adjuvant treatment and so on have a certain effect. When the drug is used for supplemental medication, it is generally recommended that adults take it once a day at any time. As a therapeutic use, it is generally recommended that adults take it 3 times a day, i.e., once in the morning, once in the middle of the day and once in the evening, and the specific dosage should be taken under the guidance of a physician and in accordance with the doctor’s instructions. It can be taken before or after meals. The drug should be prohibited for those who are allergic to the product, do not self-medicate arbitrarily, in case of discomfort, please consult a doctor in time.