Both of these are in multivitamin supplements (as well as on the critical minerals list for their non-health-related uses). It’s easy to confuse the two

Both of these are in multivitamin supplements (as well as on the critical minerals list for their non-health-related uses). It’s easy to confuse the two
Many people connect iodine and salt, but are there iodine mines, like salt mines? Does it just occur in food? Why do we need iodine?