Hi Shel,
I am chiming in:
Couple of notes:
sea salt does not have significant amounts of iodine.
Neither does mined salt hence the reason Iodine is added to it.
Hypo thyroid problems can be attributed to not enough and too much iodine intake.
Here is a great reference on iodine (and micronutrients in general)
Linus Pauling Institute at Oregon State University
(search iodine in this site to obtain research info and other things also)
Luc H