Well... personally I feel like they do work. I'm not saying it's all muscle growth.. absolutely there is some scar tissue... but.. if scar tissue has to be built up I would like to choose where it is built up. My pecs are not evenly developed due to an uneven sternum as well as a muscle rupture... which led to more scar tissue.. in the last couple months the right pectoral has improved substantially in appearance. I have been doing all my shots there including some Syntherol at least once a week. I'm very happy with the results.
Does IGF work for site growth?? Yes... but the instantaneous size is due to the crazy pumps... for some muscles that makes training difficult. For me I can't do pecs, vastus medialis, and very rarely biceps... the pump is crazy and sometimes it's too much. Oil is more benign and easier to work with.. quite frankly before I hit the beach I will probably do some syntherol to get them even more even. Even if most of it is temporary.. it's permanent as long as you keep it up... same as training...