Vitamin E and vitamin C specific how long to take, should be combined with their own physical condition under the guidance of a doctor to use reasonably, is generally not recommended for long-term high dose. Vitamin E and vitamin C to take how long, should be based on their own physical state such as vitamin deficiency or whether the disease is cured, under the guidance of a doctor to use reasonably, usually not more than one month of medication time. Vitamin E may cause nausea, vomiting and other uncomfortable symptoms after long-term application, and vitamin C may increase the risk of urinary tract stones and so on after long-term use. Vitamin E and vitamin C take a long time, the probability of adverse reactions may also increase, and vitamin C suddenly stopping the drug may also rebound, resulting in vitamin C deficiency, or even scurvy, should be strictly under the guidance of a doctor to use, control the time of use of the drug and dosage of the drug, do not blindly use.