Koshering salt has large crystals to help draw excess blood out of cuts of meat, without dissolving. It’s name does not refer it to its status under religious dietary law.
Table salt, which is designed to be consumed, sometimes has iodine added because that is a trace nutrient which can be lacking in some people’s diets.
Both salts are generally considered kosher, as in suitable for observant Jews to consume. Iodine isn’t a problem.
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