Re: pros and cons of iodine
If you are hypo from any cause other than iodine-deficiency, taking iodine can make you feel far worse than you do now. And as Pixie says, hypoT due to iodine-deficiency is extremely rare in the western world.
Mary Shomon reports in her book that she tried it to help with her Hashi's, and it made her worse. She also has gotten many such reports from patients who've written to her with their experiences.
Hashi's damages the gland itself. Trying to boost a dying gland with the raw material to make thyroid hormone is like putting high octane gas into a car with fuel injector problems. It still isn't going to become a race car no matter how much gas you pump into it.