A review of clinical trials published in the April 21st issue of the Journal of the American Medical Association concluded that 200 mg a day is the maximum human cells can absorb, making anything above that level a waste. I wouldn't worry if you've been taking the higher dosages I've recommended in the past as vitamin C is water soluble and anything not used by the body quickly passes out. In fact, I still recommend higher dosages to those not getting at least five servings of fruits and vegetables as part of their daily diet. Since vitamin E is fat soluble, it must be taken with food to be absorbed. I take vitamin E at lunch or dinner.
Selenium is a trace mineral with antioxidant and anticancer properties.
Selenium and vitamin E facilitate each other's absorption, so take them together. Doses above 400 micrograms a day may not be healthy. I recommend a natural form, which is easily found in health food stores. Read the label to make sure it gives you lycopene, the red pigment in tomatoes that helps prevent prostate cancer, and lutein, which protects against cataracts and macular degeneration. I take mine at breakfast.