Synthol is a site enhancement oil (SEO) meant to create the illusion of a developed muscle. Due to its cosmetics properties the substance is used heavily in bodybuilding, fitness and modeling. Bodybuilders rely on synthol to hide a lagging body part which may not be responding well to training. Synthol is often infected in the muscles of the lower leg (calves), the visible shoulder muscle (deltoids) and the muscles of the upper arms (biceps and triceps). The use of oil to cover a weakness is commonly referred to as “fluffing”.
The oil used in synthol is normally based on medium-length MCT chains, because it’s believed that this gives the best effects. The lidocain in synthol is a local anesthetic designed to reduce the pain commonly associated with site injections, while the alcohol is meant to sterilize the mixture.