I think they meant stuff like pre workout mixes and post workout mixes. Hyper processed proteins, BCAAs, Caffiene, Beta Alanine, argenine, creatine, taurine, etc… followed by a chaser of a dozen or so pills like ZMA. Then of course the HGH, T, Sermorelin, Ipamorelin, & CJC-1295.
Aside from the wealthiest, body builders generally destroy their hearts and bodies filling them up with dozens of cheap suspect supplements that don’t have solid lab testing. And they are always pushing new frontiers on shady pseudoscience to get a fresh edge with whatever side effects that has on longevity.
Arnold got out before that part of the scene got super out of control. But even with him, you can see it in the way his forehead and gut shape have changed over time. The very clear signs he’s juiced, just probably under a lot more perfect control from medical professionals due to his wealth.