i think youre right. doesnt have to be mercury, though.
i also think some may have misunderstood me. 800mcg of selenium is the maximum SAFE dose according to a very good study. another study showed 400mcg to be the maximum dose. i got along with an average of 1000mcg for a long time. but if one finds they need less, all the better.
sounds like youre bumpin a little mercury your ownself.