5 years post RAI, male at age 49, and feeling GREAT! Took us, my great endo and I, about 8 months to get me on the correct amount of Levoxyl and it has been clear sailing since then. One pill first thing in the am and that is it. I’m honestly in best physical shape in my life, long walks with the dog help with that. Good luck with whatever treatment path you choose, I know I chose the correct path with my treatment for Graves.