Re: Why some may have prob with higher doses iodine

>> it binds up the offending toxins such as mercury and fluoride.

Certainly an important factor but IMO the most important factor of Selenium is to change existing cancer cell destruction to Apoptosis vs Necrosis.
Which is of course why the RDA is so low...

from:
http://aor.ca/int/related_research/semc.php

Apoptosis vs Necrosis: Inorganic selenium kills cancer cells through nonselective damage to the DNA and cell membranes of both healthy cells and cancer cells, leading to toxic cell death (necrosis). SeMC selectively activates cancer cells’ “suicide program” (apoptosis) without damage to healthy cells.
• Gene expression: SeMC regulates cellular growth programs, inhibiting cancer cells earlier in the cell cycle than does inorganic selenium.
• Angiogenesis: SeMC may also act by cutting off the growing tumor’s blood supply more effectively than the common selenium supplements, without interfering with the growth of blood vessels in normal, healthy tissue.