Synthol, otherwise known as site enhancement oil is used by some people (including bodybuilders) to increase the apparent size of their muscles by directly injecting the oil into their muscle tissue.
Users treat it as a short cut of looking like a body builder, without the actual hard work of bodybuilding training.
With repeated injections, a larger volume of synthol builds up inside the muscle, expanding its size like a balloon filling up with air.
Side effects of synthol can cause nerve damage, stroke, ulcers, pulmonary embolisms, and much more.
Injecting synthol is very dangerous and if that doesn’t deter potential users, there is also a problem from an aesthetic standpoint; synthol use makes ones body look deformed (just see for yourself in the pictures below).