I had my thyroid removed 10 years ago due to cancer. I am now reasonably steady on 40 mcg T3. I have noticed that a lot of people appear to take a lot more than I do and they have a thyroid. I suspect I may be under medicated as I still have symptoms. I am 5' 4" weighing 9st 8lbs/61 kilos., is 40 mcg of T3 sufficient medication?