One capsule of vitamin E a day usually does not cause significant damage, but there are a wide range of food sources of vitamin E. Routine supplementation through the use of drugs or supplements is not advocated for healthy people. Vitamin E is mainly used in cardiovascular and cerebrovascular diseases as well as in the adjuvant treatment of habitual abortion and infertility, and should be supplemented under the guidance of a doctor or dietitian. If vitamin E is used in excess for a long period of time, it can cause nausea, vomiting, dizziness, blurred vision as well as diarrhea and stomatitis. However, there are a wide range of food sources of vitamin E. Food oils used in normal cooking, including sunflower, peanut, corn and soybean oils, are rich in vitamin E, so additional supplementation is usually not necessary. Of course, if vitamin E deficiency exists, you need to take vitamin E scientifically under the guidance of your doctor.