T3 Dosage (Work in Progress)
Maximum during fasting (no AAS): 25mcg during fasted periods. That is 5mcg every 4 hours.[1]
Dosing, non-fasting (no AAS): I don't know. My guess (GUESS!!) is that 50mcg will not cause significant catabolism.
Dosing with AAS: Again, I can't say. I have no studies. But if 25mcg causes no catabolism while fasted without any hormones, we can bet that we can go over 50mcg daily without signifigant muscle loss.

How to run T3:

T3 is suppressive even at low doses. It will take approximately 2-5 weeks for T3 levels to return to normal [2].

Choose a dose. I suggest starting at 25mcg for the first week, and increasing dose each week.

DO NOT exceed 25mcg if you are going to be in a fasted state.

DO NOT exceed 50mcg if you are not using hormones (in fact, I probably wouldn't exceed 25mcg).

DO NOT exceed 100mcg for any reason. Just don't.

After running T3, you MUST makes sure you switch to another fat burned such as clen, ECA stack, etc. You will have lower T3 after you are done with T3 and you have to make sure that you don't rebound due to the lack of T3 in your body. Remember, it takes 2-5 weeks for T3 to return to normal levels. So...

T3: Week 1-4 25/50/50/50
EC/ECA: Weeks 5-8 (dosed per how you like)

[1]The effect of T3 and reverse T3 administration on muscle protein catabolism during fasting as measured by 3-methylhistidine excretion, Burman KD, Metabolism. 1979 Aug;28(8):805-13

[2]Recovery of Pituitary Thyrotropic Function after Withdrawal of Prolonged Thyroid-Suppression Therapy, Apostolos G. Vagenakis, M.D, N Engl J Med 1975; 293:681-684October 2, 1975