There are selenium supplements and then there are selenium supplements. There needs to be a fine line because too much is toxic(1), and the wrong kind might work against you.
Here is some helpful info I gathered from a Dr. Mark Lupo, on this forum:
"Selenium at 200mcg per day is being looked at to improve immune system thyroid disease such as Hashi and Graves. There are limited data regarding long term use. Use the amino acid form (selenomethionine or selenocysteine) and not the salt form. Over 1000mcg/day may be toxic.... Take a multivitamin as well."
I assume the multivitamin is to make sure you have the cofactors necessary to absorb the selenium.
Please remember never to overdo the following vitamins: A, D, E, & K. Other types of vitamins (such as B-vitamins) will simply pass out of your system if there's excess, but ADE&K are retained by the fat and organs in your body and accumulate there, so it's much harder for your body to regulate it. OD'ing on A especially is not fun, happened to a friend of mine who had a bad batch of vitamins!
Also remember that it's always better to eat supplements in the form of food and not pills. There are all sorts of goodies in food, namely phytonutrients, that we haven't studied or discovered yet and likely do us thousands of times more good than a pill alone. Eat eat eat! Whole grains, fruits and veggies beat pills any day.
1. Med Hypotheses 1993 Aug;41(2):150-9. Selenium--its biological perspectives. Bedwal RS, Nair N, Sharma MP, Mathur RS. Department of Zoology, University of Rajasthan, Jaipur, India.
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