Kybella is an FDA-approved injectable treatment used to improve the appearance of moderate to severe fat beneath the chin, often referred to as a "double chin." The active ingredient in Kybella is synthetic deoxycholic acid, which is a naturally occurring molecule in the body that aids in the breakdown and absorption of dietary fat. When injected into the fat beneath the chin, Kybella causes the destruction of fat cells, leading to a noticeable reduction in fullness in that area. The treatment is typically administered through a series of injections spaced out over several sessions, with each session lasting about 15-20 minutes.