Vitamin E is usually safe when taken as directed, but high doses can cause side effects, states WebMD. Side effects from excessive vitamin E include nausea, stomach cramps, fatigue and diarrhea. Other possible side effects include rash, bleeding, bruising and weakness, and some people may experience headache or blurred vision.
People should check with a physician prior to using vitamin E if they have conditions related to bleeding or blood clotting, allergies, vitamin K deficiency, anemia or an eye condition called retinitis. People who have recently had surgery or have surgery approaching should speak to a health care professional before taking vitamin E, notes Drugs.com.
People with kidney or liver disease or a history of cancer, stroke or blood clots should not use vitamin E without a doctor's advice. Because the effects of vitamin E on unborn or nursing babies are unknown as of 2015, pregnant or nursing women should not take vitamin E. Vitamin E should only be taken as directed on the label or as instructed by a doctor, states Drugs.com.
The daily recommended dose of vitamin E is 15 milligrams, notes WebMD. While it is available in supplement form, it occurs naturally in such foods as eggs, vegetable oils, meat, fruits, vegetables and cereals.