When I used iodized table salt it tasted awful. I got a couple of kinds of Sea Salt ; real salt, and unrefined coarse stuff from Trader Joe's. I highly recommend getting it; it tastes so much better and no Iodine added over what naturally occurs.
Originally the Iodine was added to prevent cretinism and goiter that people got from their deficient diets in the 19th century.
I imagine that you could get too much Iodine if the salt absorbed, but that wouldn't happen right away.