Arizona I think you make a good statement for people to think twice about thyroid med's, or take them more seriously than juice. To me personally they are the most dangerous of most of the bodybuilding drugs we talk about on these boards(besides DNP obviously and slin). Mainly because you can mess up your thyroid function pretty easily. Like someone said above, a steroid crash is one thing, thyroid crash is another.
I lived near Venice Beach for about 5 years, worked out at the Gold's & World's there. I also at the time was a pharmaceutical rep for a company that made a generic version of Synthroid (the #1 selling T4, #1 thyroid med in revenue) So I got to talk with alot of endo's about athletes use of thyroid med's, since they saw alot of these people due to the location. One Dr., a vietn. guy who was one of the smartest people I've ever met, gave me horror story after horror story. He wasn't trying to scare me either, but probably 80% of his practice was thyroid patients. He would let me sit in on a patient consultation (if the patient agreed) for my own benefit to learn. When you've sat across from someone that can't get their thyroid functioning properly (especially if they're fitness minded), you won't see a more depressed person. Months of massive weight, mood, etc... swings and weekly visits to the endo for bloodwork and adjustments. So I see Arizona's thoughts that it can easily turn into a vicious cycle and for some people could cause much more serious problems. And if you were a newbie and just found this board with the amount of T3 posts you might jump into it quicker than you should
Given all of that, I would like to hear people's thoughts on a smaller dose, say 5mcg-12.5mcg/daily for extended periods(months) as more of a "metabolic optimizer". I wish I still lived by some of my old Dr.'s so I could ask some of the more open minded ones about this.