I have been taking T4 @ 100mcg per day with my HGH supplementation. I noticed that it makes me very very sleepy and hungry as a horse. I read a few other posts about T4 making them tired but why does this only occur with some people? I get so tired that I feel like I could just pass out. This doesnt seem to make any sense because your speeding up your thyroid which should give you the opposite effect. I had my BW checked before my hgh and T4 supplementation, my T4 and T3 were both on the low side of the ranges.