Selenium - sources of the antioxidant selenium are Brazil nuts, brewer's yeast, designer yeast powders (very good source), kelp, brown rice, molasses, seafood, wheatgerm, whole-grains, garlic and onions.
If you are going to use brewer's yeast you must ground the tabs and place in juice for atleast 8 hours and then drink. Brewer's yeast is excellent but the taste is yuk.