Hearsay, definitely not mineral oil. Real bodybuilders don't do intramuscular injections, and some "cheaters" take steroids instead of oil. People who don't exercise and want to increase muscle circumference will inject fillers into the muscles (it's not easy to exert force after filling, and there are all kinds of birds). For example, there was a Russian boy named kirill Tereshin, who was called "Popeye in reality", but he was beaten in minutes and had no strength at all. It is said that he used homemade fillers, the main component of which is edible oil (olive oil), and some people used silica gel.