Crystal Diamond salt (yes that’s a brand name). They have several different versions including iodized.
If you were to user kosher salt (really describes a salt with a specific shape not a religious salt) in preparation of your food (and it doesn’t take a lot to bring out flavors) then you wouldn’t need to use this grinder stuff on the table (except maybe for salads or raw foods)
I use Morton’s coarse grain kosher. I’m lost trying to season with fine grain now!
You can buy iodine in a bottle & swipe it on your skin directly. It will be absorbed if you are deficient.