Dumb asses. That is NOT synthol. Does anyone remember back when he first hit the wrestling scene about 85? (maybe earlier) He had a great chest and shoulders and his biceps were big and domed shaped. No peak. Now you thinking synthol right? Not so. Look at him later in his career after his first WWF stint with his brother Rick. He went to Japan and promptly tore both biceps. His left bicep was torn so badly that the docs could not even reattach it to the insertion point and bone again. He shredded that much muscle when it tore. Instead they ran a flexible (don't know the name of it or what it is called) "tubing" or "cable" from him shoulder to his elbow and attached his bicep to that cable for reenforcement. That is why he had such a funny shaped bicep and peak. If you look at him when he strikes a pose, he keeps his fist turned away from him like that dude from the Sha Na Na show. Naturally if you want to really peak your bicep, you turn your fist towards you to contract the muscle belly more. In his case, you can already see a gap between his bicep belly and elbow when he has it facing the other way, if he turned it towards him, the gap would be more pronounced and ugly. The most he will do is turn his hand with his fingers facing forward.
He explained all this in that Ironman article he had done on him. You have to read the entire thing, not the edited version. They left out a lot that was covered. They kept this out because they wanted it to appear that he really did build those biceps in the gym. But in truth, they were a response from a severe muscle tear. It was online a couple of months after the magazine ran it.