TweetOne other thing I have to mention about T3 is the myth that it's going to shut your thyroid down forever. I'm not a doctor or an endocrinologist but I've seen enough guys run T3 for years at a time and just stop and have absolutely no problem. So, yes it's not scientific evidence I'm giving you but it's what I've witnessed over the last 20 years. If you can do it at all it is very difficult to shut your thyroid down forever.