Hmmm Im dubious. If guys like Mike Israetel are right, though myostatin may contribute to gainz-limitations it is but a minor player. Also, if youre at that point/stage in development that myostatin is a genuine concern, youre pretty much hitting your "enhanced" genetic ceiling, and youll know youre there cos the AAS quantities youre prepared to take aint doin much. In which case, you add GH and insulin. Like, what most pros do.