Update from my previouse post, after initial one week taking 2.5mg I took 5mg carbi. My blood work free t4 improved from 3 times higher to 2 times. My hear rate from 102 to 77 per minuts. Important note here is I took 5mg instead of 15mg carbi. Along with 5mg Carbi I took 1000mg L-Carnitine. My TSH still cannot be found which is normal according to my Endo. It will take 4 to 6 months she said. The main concern why I didn't follow the dosage of what my Endo suggested. I am afriad of being hypo. Hope my experience helps.