So how long should it actually take to feel/see a difference when adding T3 to the T4? I started on T3 9 days ago. I am currently taking .137 Synthroid and 5mcg of T3 twice daily. I feel some what better, however, not experiencing the 'feel better' I thought I would. Have much more stamina since having my Synthorid upped in July to the .137. I can really tell that difference. Endo won't retest me until March! So if I read correctly from previous posts my TSH will rise? When I had it tested this last time it was at .525 and my T3 was at the bottom of the range. Just curious how this all works. Since if I am correct, I am taking the equivalent to .167 Synthroid?