There is no exact time to take vitamin C. It is fine to take it at any time of the day. Vitamin C can prevent the occurrence of scurvy and is commonly used in the adjuvant treatment of purpura and various acute and chronic infectious diseases. However, pregnant and lactating women should take it with caution. In addition, this drug long-term large quantities need to be gradually reduced and discontinued, so as not to cause post-discontinuation scurvy; long-term application of large quantities can be caused by cysteine salts, urate, oxalate stones, but also diarrhea, headache, red and bright skin, nausea and vomiting, frequent urination, stomach cramps and other discomforts. In addition to the direct oral use of vitamin C preparations, you should also eat more fresh vegetables and fruits rich in vitamin C, such as apples, oranges, grapes, dragon fruit, spinach, carrots, lettuce and so on. Warm tips: the drug should be taken under the correct guidance of a doctor, do not take blindly.