There is "something" that strikes me as unreasonable about the new wave of high dose iodine therapy.

This article explains why:
http://thyroid.about.com/od/newscont...muchiodine.htm

Our bodies do not absorb iodine when it is at sufficient levels.
When you read that thyroid supplements are withheld before certain treatments or tests, it is because the purpose is to create a negative balance so the radioactive iodine will be absorbed well.(as per that link) This does not mean levothyroxine is BAD in any way. It is composed of iodine molecules...that is how it works.

If you do not take a multivitamin with 150mcg in it, and you don't use salt at the table, and you eat processed foods mostly, then using 150mcg per day is a good idea. Vegetarians who do not eat seafood, or meat also are at risk. But I remain on the fence for recommending any more than that daily, because the evidence is still lacking about safety issues.