So long double chin. Kybella contains a synthetic deoxycholic acid. Deoxycholic acid is a naturally occurring molecule in the human body that aids in the breakdown and absorption of dietary fat. When injected into the fat beneath the chin, Kybella permanently destroys the fat cells, resulting in a noticeable reduction in the fullness under the chin and a more youthful appearance. Results from Kybella can be seen one month after treatment. However, up to 3 treatments for desired result is usually necessary.