If he took SEO then it is much more likely this is the cause than AAS.
there is research from Denmark showing how SEO wrecks kidney. Short version: The oil acts like a form of "d vitamin" enhancing calcium uptake in the gut that ruins kidneys.
They have a clinic specifically treating patients who have used SEO
It is the kidneys that fail. And it is due to the SEO
I have no idea about AAS and kidneys
But...where are all the pro guys from 70s and 80s with failing kidney? They did not exactly go light either. I am not familiar with 80s guys with failed kidneys
Guys in the 70s did not stay on 365 days a year.
Usually they only did one or two cycles a year of 6-10 weeks.
Even so some guys had bad side effects.
Like most drugs, side effects are dose dependent.
Ibuprofen can mess you up if you overdue it. Read the label.
Once the promoters came up with a series of multiple competitions in a given year I think it got out of hand because bbs were staying on too long.
