Synthol Freaks 2015 <br /> <br />Synthol is a mouthwash, hair product and tonic. However, it is also used for the treatment of muscular pain too but some people (including bodybuilders) use it to increase the apparent size of their muscles and others directly inject it in their muscles. <br />With repeated injections, a larger volume of oil builds up inside the muscle, expanding its size like a balloon filling up with air.
