I don't believe that sea salt has iodine. It is to added in commercial salt, but does not occur naturally in sea salt.

Could it be MSG? I'd be surprised if Newman's and Amy's had MSG, but with all the huge company buy-outs, it would not surprise me if those companies have been bought be a larger company that did not stay true to the founders' philosphy of healthy food.

Stay away from shellfish. I get slight tingling in my fingers and lips, but that's enough to keep me away.