They got real GH from human cadavers. Might not have been readily available but they got it.. and T3 was around because Zane abused it so much he's dependant on it now
thyroid meds have been around for a long time. we are talking the 1920's!!
now i don't know if bodybuilders used them in the 70's yet because a lot of these compounds even though they were around we didn't have the fitness boards and networking we do today where guys can share their ideas and compounds they are using.