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Although there are trace elements and minerals in sea salt, MayoClinic.com says the amounts of these nutrients are insignificant. Furthermore, the added iodine in table salt can help prevent thyroid problems such as goiter, says Aurora Health Care. If sea salt is used as a substitute for table salt, other foods such as seafood, potatoes and spinach should be used to obtain the recommended dietary allowance for iodine, which is about 150 micrograms for most adults. source