It should not be doing you any harm. Are you eating any CDN wheat products? or Shellfish - Tuna? Look up a list if foods which contain selenium... it varies.. cattle which graze on high selenium pasture will have more... areas which are deficient are the US NW and NE. Montana, Dakota and other Midwest states are not. Selenium yeast is selenomethionine I believe. If you are already intaking much selenium in diet, it is probably not necessary to get that much in tablet form. However if I were prone to family history of thrombotic or bleeding stroke I would not hesitate to take 150 mcgs. Google your state or province and selenium in soil or other hooks. See what you come up with. See if there are any ruminant deaths (sheep) from selenosis. If so, and you eat local wheat products chances are you are getting enuff selenium. If you live in New England/NY/Vermont/Washington and do not eat tuna and local shellfish, then you may not be getting selenium from local grain products. Since agriculture/food distribution is Pan American it is hard to imagine you are selenium deficient, but this is what they find. More than 400 mcgs from all sources is not advised. The toxic level becomes sharp at 1000 mcgs a day. Don't worry about the ruminants, they absorb more because of their multiple stomachs and ingest far more grains per lb than you. You would not die eating the same grains, but remain healthier paradoxically.
Best way to get selenium is thru wheat germ oil made from CDN wheat or eat organic CDN wheat products and shellfish/tuna/asparagus etc... Coupla Brazil nuts a day should do it.
From the table below it can be seen that unless one is chowing down on a lb of Brazil nuts a day, it would be hard to get to 300 mcgs of selenium a day.
Table 1: Selected food sources of selenium [11]
Food Micrograms DV*
(µg) Percent
Brazil nuts, dried, unblanched, 1 ounce 544 780
Tuna, light, canned in oil, drained, 3 ozs 63 95
Beef, cooked, 3 ounces 35 50
Spaghetti w/ meat sauce, frzn 1 serving 34 50
Cod, cooked, 3 ounces 32 45
Turkey, light meat, roasted, 3 ounces 32 45
Beef chuck roast, lean only, rstd, 3 ounces 23 35
Chicken Breast, meat only, roasted, 3 ounces 20 30
Noodles, enriched, boiled, 1/2 cup 17 25
Macaroni, elbow, enriched, boiled, 1/2 cup 15 20
Egg, whole, 1 medium 14 20
Cottage cheese, low fat 2%, 1/2 cup 12 15
Oatmeal, instant, fortified, cooked, 1 cup 12 15
Rice, white, enriched, long grn, ckd, 1/2 cup 12 15
Rice, brown, long-grained, cooked, 1/2 cup 10 15
Bread, enriched, whole wheat, 1 slice 10 15
Walnuts, black, dried, 1 ounce 5 8
Bread, enriched, white, 1 slice 4 6
Cheddar cheese, 1 ounce 4 6
*DV = Daily Value. DVs are reference numbers developed by the Food and Drug Administration (FDA) to help consumers determine if a food contains a lot or a little of a specific nutrient. The DV for selenium is 70 micrograms (ug). Most food labels do not list a food's selenium content. The percent DV (%DV) listed on the table indicates the percentage of the DV provided in one serving. A food providing 5% of the DV or less is a low source while a food that provides 10-19% of the DV is a good source. A food that provides 20% or more of the DV is high in that nutrient. It is important to remember that foods that provide lower percentages of the DV also contribute to a healthful diet. For foods not listed in this table, please refer to the U.S. Department of Agriculture's Nutrient Database Web site: nal.usda.gov.
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