No one here can prove that there is. There are probably at least 100 men more muscular than Jay Cutler but 100% completely natural and stronger too.
Thats what you think. Do not underestimate the power of steroids or growth horomone. And do not take what people sy for granted when they tell you they are "clean". To them clean and natural means taking 4 sustenon a week instead of there usual 8 or 2 anadrol a day instead of there usual 6.
PB