Kybella is the only FDA-approved injectable for dissolving the “double chin” — the pocket of fat under the chin known as submental fullness.
Kybella is the only FDA-approved injectable for dissolving the “double chin” — the pocket of fat under the chin known as submental fullness. It uses deoxycholic acid to permanently destroy fat cells in that area, offering a non-surgical alternative to liposuction. This guide covers what Kybella is, how it works, how many sessions you’ll need, what it costs, the downtime and safety, and whether it’s right for you.
Kybella is the only FDA-approved injectable for dissolving the “double chin” — the pocket of fat under the chin known as submental fullness. It uses deoxycholic acid to permanently destroy fat cells in that area, offering a non-surgical alternative to liposuction. This guide covers what Kybella is, how it works, how many sessions you’ll need, what it costs, the downtime and safety, and whether it’s right for you.
Kybella (deoxycholic acid) is an injectable cytolytic — “cell-killing” — drug. Deoxycholic acid is a molecule your body makes naturally to break down dietary fat; the synthetic version in Kybella, when injected under the chin, ruptures fat-cell membranes so those cells die and are cleared by the body. It was FDA-approved in 2015 and is the only injectable approved for submental fat. It’s made by Allergan (the same company behind Botox and Juvederm), and is administered as a quick in-office series of tiny injections.
Quick comparison — Active ingredient — Kybella: Deoxycholic acid (synthetic) | Maker — Kybella: Allergan / AbbVie | FDA approval — Kybella: 2015 — submental fat (double chin), adults | How it works — Kybella: Cytolytic — destroys fat-cell membranes | Sessions — Kybella: 2–6, about one month apart | Each session — Kybella: ~15–20 min; 20–50 small injections | Results — Kybella: Gradual over 2–4 months; permanent fat-cell loss | Typical cost — Kybella: ~$1,200–$1,800 per session.
When injected into the fat beneath the chin, the deoxycholic acid breaks down fat-cell membranes, causing the cells to burst and die. Over the following weeks, your body’s immune cells clear away the destroyed fat, and the area gradually slims. Because the fat cells are physically destroyed — not just shrunk — they don’t come back. A session takes only about 15–20 minutes, with 20 to 50 tiny injections after the area is marked and numbed.
Kybella is FDA-approved for one specific area: submental fullness, the “double chin.” It’s designed for people bothered by under-chin fat that doesn’t respond to diet or exercise — often a genetic trait rather than a weight issue. Some injectors use it off-label for other small fat pockets (jowls, bra fat, armpit “bra bulge”), but the chin is its only on-label use. It is not a weight-loss treatment and works best for those already near a stable, healthy weight.
Most people need 2 to 6 sessions, spaced about a month apart, with the exact number depending on how much fat is present and your goals (six is the maximum on the FDA label). Results build gradually over the weeks between and after sessions — it’s not an instant fix. Many practices average around four sessions. Your provider maps a plan at consultation based on your anatomy.
Yes — this is one of its biggest selling points. Because the treated fat cells are destroyed and cleared, they don’t regenerate, so the reduction is permanent as long as you maintain a stable weight. (Significant weight gain can enlarge any remaining fat cells nearby.) That permanence is the opposite of neuromodulators and hyaluronic acid fillers, which wear off and need maintenance.
Roughly $1,200 to $1,800 per session, so a full course of several sessions can total a few thousand dollars — more than a single syringe of filler, but it’s a one-time investment rather than an ongoing one, since results are permanent. Cost depends on how much fat you have, how many sessions you need, and your provider and location. It isn’t covered by insurance for cosmetic use. As with any injectable, prioritize an experienced provider over the lowest price.
The most universal effect is swelling — often significant in the first few days (sometimes called “bullfrog” swelling) and lasting one to two weeks. Bruising, numbness, redness, and tenderness under the chin are also common and temporary. The most important serious risk is nerve injury: deoxycholic acid can affect the marginal mandibular nerve, causing a temporary uneven smile, or rarely trouble swallowing — which is exactly why precise, experienced injection matters. Because it can damage non-fat cells too, it must be placed by a trained professional. Its risk profile is different from filler side effects and Botox’s side effects.
For a double chin, the main alternatives are CoolSculpting (fat freezing, also non-surgical) and liposuction or a neck lift (surgical, one-and-done but with real downtime). Kybella sits between them: no surgery, but multiple sessions and swelling. It’s important to understand Kybella does something fundamentally different from the other injectables in aesthetics — it removes fat, whereas Botox relaxes muscle and dermal fillers add volume (the difference between those two is covered in Botox vs dermal fillers). Many people combine treatments — for example, Kybella to slim the chin and filler to sharpen the jawline.
Kybella occupies its own lane. Aesthetic injectables do three broad jobs: relax muscle, add volume, or remove fat. Muscle relaxers are the neuromodulators — Botox plus its alternatives Dysport, Daxxify, Jeuveau, and Xeomin (each weighed against Botox in vs Dysport, vs Daxxify, vs Jeuveau, and vs Xeomin) — used for movement lines like forehead wrinkles and judged on how long they last and what they cost. Volume is the job of fillers such as Juvederm and Restylane (see Juvederm vs Restylane), used for lip filler and concerns like under-eye hollows. Kybella is the only one that subtracts fat — understanding those three jobs is the key to building the right plan, and often combining them.
Good candidates are adults bothered by moderate-to-severe under-chin fat, at a stable weight, with reasonably good skin elasticity (Kybella reduces fat but doesn’t tighten loose skin). It’s generally avoided in pregnancy or breastfeeding, with an infection at the site, or if you have trouble swallowing. If your concern is jawline definition or volume rather than fat, fillers may suit you better; if it’s movement lines, a neuromodulator is the tool. A consultation is the only way to confirm fit.
Because of the nerve-injury risk and the precision required, provider skill is paramount — even more than with other injectables. Choose a licensed, experienced provider (a board-certified dermatologist or plastic surgeon, or a trained injector under medical supervision) who treats the submental area regularly and can show before-and-after results. Find and compare qualified injectors near you, and review the broader injectable landscape to see how Kybella fits alongside wrinkle relaxers and fillers.