i prefer tren to prevent muscle wasting on t3. but research thyroid before you dive into it...
with t3, no need really to venture over 50mcg unless competing. ive tried up to 100mcg and it wasnt worth it imo.
t4 is usually taken at a 4:1 ratio over t3, but i feel its only synergistic with gh in the mix too. 100mcg t4 ~ 25mcg t3 when converted in your system, which is about baseline.