Also take Kelp here and there, but lately don't like the fishy taste so much.
I pop a zinc or half a selenium now and then but rather would eat broccoli. B Vitamins never did well with. Vit c from lemons and limes.
I object to your use of the word 'required'. It reeks of dumbness.
I have seen people through hypothyroid without the use of any pills whatsoever.
Moreover as I have stated many times before, Iodine is just one mineral in a veritable sea of essential nutrients. Reducing health down to all of these compartmentalized boxes is a voyage for the idiotic, unless, as I have also said before, you are targeting a specific type of detoxification like halogens.
Seriously though, what is your exact neck size? Are you able to shop at regular stores for dress shirts?