IMO most toxic mg to mg- Halotestin, D-bol, Anadrol.
Halo is only recomended at 20-30mg
D-Bol stronger more effective in low dosage but 30-50 mg
Anadrol just is taken in higher doasges so of course you take 150-200mg of any 17aa its going to be toxic

About this guy and 9000 calories... I had to bulk for a film role and they had me on 7000 cal a day. It sucked but I had to do it. I know Michael phelps in an interview said he needed to eat 10k a day! hes not a bulky dude either but I know he swims his ass off. I just agree people do it but hard as hell to do consistently.