I had a slightly underactive thyroid a few years ago, and I knew so many people who were on the conventional thyroid meds and who had found them helpful at first, but then many of their old symptoms came back. So I did a bit of research and started taking high doses of iodine instead. It worked for me, and I documented my progress in a YouTube video diary. It's interesting for me to look back and see how sluggish and puffy-faced I looked back then! My YT channel name is Freethinking Health. I'm not saying this treatment is for everyone, but it worked for me. There are some good books on the subject too.