depending on your physiology it ranges, for many that weigh in at 200lb they handle 100mcgm of T3 a day, others though get jittery on it, either way you start with one and move up to make sure you dont over do what your particle body can handle. T4 just doesnt pack the punch and both effect the loopback mechanism of the body so if your going to lower or shut down your own production you might as well make it worth while.
T3 typically comes in 25 macro grams per pill with a notch for cutting it in half,. Cytomel is the american version and Cynomel the mexican