TweetT-3 causes hairloss if taken more than 1mcg per pound of bw. I took a little over 200mcgs for 6 weeks all in the A.M. back in April with no AAS and notice that hair thinned a bit and the hairline receding, don't know if me tying my ponytail real tight was a factor though. But it definitely made my hair look like vermicelli strings. My advice, if one was to take T-3 would be to keep it under 100mcgs.