One of my professors knew Arnold very well. Arnold was dating his female roommate (70's or 80's, I can't remember). They helped each other with injections and some training when Arnold was around, and he shared what Arnold and he were using during that period he knew him. He really liked test, dbol, and deca. He also liked anavar and primobolan. I can't speak for parabolan, but the ones I mentioned he really liked. This professor was a world class athlete with world records for his prospective sport. He was slender built, but had pretty good genetics while he was on them (think Zane type build). He quit using them for around a decade or more, but when I met him in the 90's I sold him a bunch of Brovel 50ml deca and also test (yea, I know...lol). He would share stories about them all the time, and even had pictures with Arnold. Unfortunately, he was killed a few years later. The guy was a stud, and when he was using AAS when he was younger, he looked like a bigger Frank Zane type, and the one picture he bragged about the most, he made Arnold look like a doughboy, lol. Arnold tried to get him to compete, but he was scared from using the doses Arnold was using. He was using right at half the amount Arnold was using for awhile, then just quit. He went back into sports, and of course he was also a teacher.
I seen an article years back on a typical dosage of what Arnold was using, maybe it was Mike Arnold, and it was pretty damn close to what the professor told us about. This professor also knew Ric Drasin and I've seen pictures of them together...though in those pics, he was tiny still (well, slender). This was late 70's or early 80's.
Anyway, I don't really like mentioning this in the open too much for a few reasons.