“So for most people it wont help much.”
Actually, it’s the opposite. Most people, particularly in America, do NOT have enough iodine in their system. And, your thyroid does not discern between ‘good’ iodine and ‘bad’ iodine so if you load up on iodide (but preferably an iodine/iodide ratio) you will saturate yourself and be generally protected from the radioactive version.
pretty much what I said.