Eltroxin, 0.1mg, and I do lose weight on Atkins. I've been on this level for about 5 years, steadily increased from the lowest dose up to this on the 5 years previous to that. I used to take Synthroid until a couple of years ago, but there was something that happened, a question of quality control at the lab I think, that made my doctor stop using it.

When the first doctor prescribed it all those years ago, she said not to expect any weight loss just because of the pills - and she was right! It seems to have combined with Atkins just fine, though.