Kybella injections are performed in a series of treatments to reduce the excess fat over time, effectively dissolving the fat, which your body slowly removes. The main ingredient in Kybella is a substance called deoxycholic acid. This active ingredient helps them to break down and absorb the fat cells to be flushed out of the body over time. With a series of treatments, patients can experience a noticeable reduction in fullness and mild tightening of the skin.