Hi Cyclo! Don't give up on Lithium just yet. I am on 1200mg as well and didn't do well on my thyroid labs. My numbers were too high so my doc put me on Selenium, which is an over-the-counter supplement. I too one pill a day for three weeks and went in today for my follow-up. He said my numbers are right where they need to be. Give it a shot, it worked for me.