There is a WORLD of difference between being WITHIN range and OPTIMAL. If your range is 5 to 15 and you test at 6, you are WITHIN range, but if the majority of healthy people test at 13, and that is statistically at the OPTIMAL level where most people feel their best, you are most likely going to feel like @#$%.
http://www.tiredthyroid.com/optimal-labs.html
http://www.tiredthyroid.com/what-labs.html
http://www.tiredthyroid.com/rt3-4.html
