Sorry if this has been discussed to death. I looked for info but couldn't find what i'm looking for. I'm taking thiroyd at 1 grn to 1.5 grns a day. It has made huge improvements in my sleep cycle and helped with my energy levels. My question is am I going to permanently damage/turn off my thyroid gland by using this stuff long-term? I've read a lot of conflicting advice about how long to stay on it and whether you can bounce back. Any help?