Re: Not sure what brand of Selenium to buy.

No more than 200mcg of elemental selenium daily (like from yeast)

HOWEVER, if you up the doses on your iodine/iodide, you will need more selenium, and you can take more of the l-selenimethionine form of selenium (like from the "Now" brand which is in the orange/white bottles and is VERY inexpensive).

It does make a difference.

I take 1 capsule of 200mcg of selenium (from yeast) and 800 mcg of l-selenimethionine (4 capsules) of the brand "Now" - but doing a quick search I found something even LESS expensive:
http://vitanetonline.com/description/SN0923/vitamins/Selenium-from-L-Selenome...

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