I've gone through the professional procedure with this product several times now. Following significant weight reduction, there remained a small area under my chin that bothered me. The substance gets placed straight into the fat beneath the skin in just that spot, making it localized instead of affecting the whole body from a single shot. Based on what happened to me and the info shared by the person who performed it, multiple appointments seem necessary before any clear improvement shows up. A single visit produced almost no change, yet repeating it over intervals of several weeks led to slow progress. It's not something that works right away, and the effects might be mild, though it did address those persistent spots for me. Still, how well it works appears to differ greatly between individuals.