You're an idiot if you think ruhl has used synthol.
Why? Because nobody would use synthol in a weak part and then leave their extremely lagging triceps untouched.
Wrong! Nasser had impressive delts, and nonetheless he injected that crap on them. He didn't on his back, though....
Some of these guys tend to add synthol where is not necessary so they can claim, "oh I've always been stronger there..."