The effects of Synthol (SEO) are just cosmetic, and it doesn`t help you improve muscular performance or strength training.
Synthol or other SEOs work by filling up the muscle with an oil substance.It is injected directly into the muscle that needs to be increased. Synthol (SEO) is usually used to make a particular muscle that is not quite up to standard with the rest of the body look bigger, for example: a bodybuilder before a contest, injects it in the left bicep because he thinks his left bicep is smaller than the right on, or when he has smaller calves than the rest of the body.
Check out this video of a man who died because of synthol Bodybuilder dead because of Synthol. A video answer of what Synthol really is!
Also check out a tutorial on how to inject steroids Video tutorial on how to use a needle when it comes to steroids
One of the more popular SEOs is Synthol which was developed in the early 1990s by the German bodybuilder Christopher T. Clark to replace Esiclene which went out of production at the time.