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HI sregan, I've had similar issues with it in the past at times.

What form of selenium are you taking? E.g. sodium selenite? selenomethione etc...? because according to Andy some people respond poorly to selenite but do well better with selenomethione.

Bex,

Sorry for answering this late. I'm taking this stuff:

http://www.iherb.com/ProductDetails.aspx?c=1&pid=169&at=0

Selenium is "Methylselenocysteine". I did however just buy some selenomethione which I haven't tried yet. The "yeast" form is supposed to not be so good. I wonder if the Methyl form might methylate the mercury?