Iodized salt is fortified with iodine due to a history of thyroid disorders related to iodine deficiency. It started back in the 1920s or so. [Here ](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509517/) is an article about it. Kosher salt is not iodized and is unlikely to have additional ingredients to prevent caking and such.
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