See also How to Use section.Vitamin E does not usually cause side effects when used in recommended doses.However, vitamin E may cause side effects if taken at high doses (400 units or more per day) or for a long period of time. In these situations, nausea, diarrhea, stomach cramps, tiredness, dizziness, blurred vision, and headache may rarely occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.Tell your doctor immediately if any of these rare but very serious side effects occur: easy or unusual bleeding/bruising.A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.In the US -Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.