It's both - like gator said
It is an excuse for some, and psychosematic for others and valid for others.
Trust me - wait till I am on cycle and some newbie asks:
"Hey i just got something called parabolan - I KNOW it's real cause this guy in the gym says it is - so how do i take it? I was thinking I would take an injection every 10 days and cycle it with clambutteroil??"
THEN you will see that i get more aggressive on juiceMUCH more irritable and less tolerant/patient.