should be a good stack. From everything I've read on the down-regulation of T3 levels from HGH/IGF-1 it seems to me to be best just to run T4, but I'm sure there will be many who disagree. That way your sure not to get too much in your system and become lathargic. Your body will convert T4 to T3 as needed which to me seems the best way to go. I take an assload of T4, just to make sure I have enough ready to go if needed. But, I also run 10-12iu/day HGH with 100mcg IGF-1. So, you may not need quite as much as I do.