T3 isn’t eating muscle away at 37.5 or 50mcg, it’s just being overly flat or overly fat for long periods of time, if you can maintain performance and not run yourself flat for extended periods of time you won’t lose mass.
Also if it’s your first time being that lean your probably just not as muscular as you thought you were
Also if it’s your first time being that lean your probably just not as muscular as you thought you were