Thank you for your question jenoch. I understand your concern. Kybella is the first and thus-far only FDA-approved non-surgical injectable treatment for the double chin. The double chin can be formed by various factors including age, weight gain, and genetics. The pivotal studies demonstrated that most people require two to four treatments, sometimes up to six treatments. The pivotal studies used two vials per treatment, which is what I use for my patients. Some doctors use more or less than this amount, which is fine. The more product is used the more swelling can be expected after the treatment. Although some people see results after a single treatment, for my patients I recommend starting with at least two treatments because many people do not see a significant improvement after only one treatment. Each vial contains 2 mL of product and 0.2 mL aliquots are used for each injection per the manufacturer’s guidelines; therefore, one vial would be enough for 10 injections using this method. Although in the studies up to six treatments were performed, more treatments can be performed off label. This is more common when a lower dose is used in each treatment. For example the manufacturer recommends using two vials per session. But some doctors only use one vial per session. If such a protocol is used, certainly more than six treatments may be performed. Usually, however, when two (or even three) vials are used, significant results are seen after six treatment sessions. Please consult with a doctor for specific recommendations. Good luck!