Iodine deficiency is a recognized human concern. The problem is the supplementation being done to add this to table salt is a chemical. This is not organic. Thus poisonous. The ocean waters have traces of iodine, thus salt from dried ocean water should contain organic iodine. All forms of ocean plants and ocean animals should have iodine in them.
Barefoot Herbalist MH makes some experimental tree iodine tinctures made from his black walnut trees. A couple of self experimenters have made raving reviews about this iodine, maybe they are the ones suffering from true iodine deficiency.
In the aquatic ape theory, the human ancestors were isolated, shore, ocean dwellers. They had all the iodine they needed for brain development. So humans became smarter and smarter. Now that iodine shortages are common as humans lived farther inland, people have become dumb and dumber.
Chemical iodine is a poison and should never be ingested. This is my personal opinion. Sure chemical iodine kills germs, including the human’s own germs. Natural occurring organic iodine should prove selective in weeding out the parasites and letting the human organism thrive.
My current solution is to eat more wild ocean food than land food.