...too low to be effective. But my current pdoc is doing a great job of managing it unlike the last pdoc who completely, 100 percent abandoned me. (Never called, never sent the bloodwork order in the mail). The levels came in at 0.4 and it has to be at least 0.6 to do anything. Pdoc said 0.8 would be ideal. He said to go up to 750mg once my cold starts to go away... and then to call him in the middle of next week. If I feel okay on 750mg, we will raise it to 900mg. After 4 or 5 days on that dose, blood levels will get checked again. I also got thyroid, kidney, liver, and complete blood count done and everything was normal. Good, good.