In fact, iodine deficiency
is not unusual because there used to be high levels in dairy (it was used to clean the cow's udder, now chemicals are used.
) there used to be a lot in bread because it was used as a dough conditioner (bromides are now used.) a recent study in boston showed that about 50% of pregnant women were iodine deficient. It's safe to take up to 1000 mcg daily.