I have a slow thyroid (no, not caused by my being vegan) and take levothyroxine, to keep it at the right level. This is very easily controlled and nothing to stress over. Dr. John McDougall spoke about this once. He never advocates excessive medical intervention, but he said the levothyroxine is well tolerated and an excellent way to keep the thyroid hormone at the correct level for people who have this issue.
Dr. Michael Gregor, who's a vegan nutrition wiz, has a number of short videos on good iodine sources (link below.) He has great videos on all sorts of topics, so check them out. Enjoy! He's entertaining as well as informative.
Other supplements vegans should take: B-12, and Vit D if you test low for it (by the way, the majority of people do, even those who live in year round sunny places.)
Good luck on your journey. Don't stress out, it's healthy and fun... and a new way to experience the wonderful plant foods in this world. I was a vegetarian for more than 30 years before I became vegan and would never go back. My relationship with food has completely changed. That might sound funny to you now, but just wait and see. nutritionfacts.org/topics/iodine/
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