If you are really concerned about being low on iodine you can test this yourself. You get some liquid iodine in the drug store. This stuff is what they put on your arm when you give blood to kill the germs. It makes your skin look juandiced or yellow looking.

You apply a 2 inch square of this liquid iodine to your skin and leave it there for 24 hours. (Obviously you really shouldn't shower that area.) If that iodine is absorbed within 24 hours then your body needs more iodine. You can supplement with that stuff if you want.

But eating seafood is a good source. Also sea vegetables like kelp are great too; these are very high in lots of minerals.

But using kosher or sea salt can make some low in iodine if they were basically using the iodized salt before.