I wonder to what extent this is for Americans, whose bread and cereals are so loaded that they're effectively multivitamins anyway.
I live in Norway and just realized that they don't put iodine in their salt. (Actually a lot of minerals I would have normally gotten from enriched bread back home may or may not be added here). Locals eat a lot of white fish and get their iodine that way. But I don't and have started supplementing just in case.