Go for it! Report your findings to us for sure, and with T3, remember to take it slow. Try running 50mcg/day of T3 first for 2 weeks, observe for any possible muscle loss, then up it to 75mcg/day for a couple weeks for the same thing, then to 100mcg/day, etc. I think that would be the best way to test its effects and how well peptides may assist in preserving muscle mass while using T3. Remember you're not on any time constraint here because you're not using AAS and therefore no limitations to time on a cycle. Your experiment can last as long as you need it to be, so you can go nice and slow with it.