Double Chin Fat Melting Injection: How It Works

A double chin fat melting injection is often described as “dissolving” fat, which makes it sound gentle. In fact it is a controlled injury. The solution breaks open fat cells on contact, the area swells as the body reacts, and the swelling is part of how the treatment works. Knowing this in advance helps you plan the days after each session and judge the result at the right time.

This guide comes from BeauLife Clinic, an MOH-registered aesthetic clinic (KKLIU 1970/2019) operating since 2017, with LCP-certified doctors at five Klang Valley branches. It explains what is in the vial, where the needle goes and where it must not, what the trials found, and what a course costs. It does not replace an examination by a doctor.

First, a short training lecture for injectors on why the swelling after these injections is expected rather than a complication.

1. What is in a double chin fat melting injection?

Quick Answer: Most fat melting injections for the chin are based on deoxycholate (deoxycholic acid), a copy of a bile acid the body uses to digest fat. Kybella is the US-approved version for the chin. Aqualyx fat-dissolving injections, made in Italy, use a deoxycholate-based gel. A third family, phosphatidylcholine, is still being tested in trials.

The Kybella US prescribing information spells out the dose and grid in detail. Marllor, the maker of Aqualyx, describes it as a solution for localised fat and puts a QR code on each box so you can check it is genuine. Three points matter more than the brand name:

• It works on contact. Deoxycholate damages any cell membrane it touches, so the depth of the needle decides both the result and the risk.
• It is a local treatment. It reshapes one pocket of fat; it does not lower your weight.
• Brands are not interchangeable. Kybella is not widely offered in Malaysia, so its trial results tell you how the ingredient behaves, not exactly what one Aqualyx session will do.

2. Who is a good candidate for chin fat injections?

Quick Answer: The ideal candidate has soft fat under the chin that can be pinched, is close to a stable weight and has reasonably firm skin. Injections do not tighten loose skin, reach fat beneath the neck muscle or fix a short chin bone. Our guide to chin fat removal treatment explains how to tell these causes apart.

Tell the doctor about blood thinners, a bleeding disorder, earlier neck surgery or any swallowing problem. The Kybella label warns that existing difficulty swallowing can get worse.

The same rule applies to every spot treatment: it shapes one area. That is also why calf injections in our Botox leg slimming guide are judged by outline, not by kilograms.

3. What happens during the injection session?

Quick Answer: A double chin fat melting injection session usually takes 30 to 45 minutes. The doctor confirms the fullness is fat, marks a grid, numbs or cools the skin, then places small amounts of solution into the fat layer. The doctor keeps away from a strip just below the jawline, where a nerve that moves the lower lip runs. Our Aqualyx page lists the aftercare.

1. Assessment. The doctor checks your medical history and medicines, then pinches the area with your neck relaxed and tensed to confirm it is fat above the neck muscle.
2. Product check. You can ask to see the sealed vial and scan the QR code on the box before anything is opened.
3. Marking the safe zone. The doctor draws the treatment area and a grid of points about 1 cm apart, keeping a strip 1 to 1.5 cm below the jawbone clear.
4. Comfort. Ice or a numbing cream or injection may be used, because the solution burns for a few minutes.
5. Injection. Small amounts go into the fat layer at each point, staying out of the skin above and the muscle below.
6. Aftercare. Cold packs, loose collars, no hard exercise or saunas for a day or two, and a review before the next session.

Why the strip below the jaw matters. The FDA label tells injectors not to inject above the lower border of the jawbone or within 1 to 1.5 cm below it. That is where the marginal mandibular nerve runs. A 2023 study of 62 patients treated inside this kind of mapped safe zone and reported no nerve weakness. A 2026 review of injection lipolysis concluded that safety depends mainly on anatomy, patient selection and technique.

4. How well do fat melting injections work under the chin?

Quick Answer: In four placebo-controlled trials, about two-thirds of treated adults improved by at least one grade, against about one in five on placebo. That pattern held in North American trials and in a 2025 trial of 325 Chinese adults. Kybella was tested more than Aqualyx, so the Aqualyx treatment page notes its smaller studies separately.

One grade on these scales is a visible but moderate change. Bigger changes were less common: in REFINE-2, 18.6% of treated adults improved by two grades, against 3.0% on placebo. Three details help set expectations:

• Session count matters. The trials allowed up to six sessions; most patients improve gradually rather than after the first one.
• Asian data now exist. In the Chinese trial, MRI showed at least a 10% fat volume drop in 50% of treated adults, against 15.2% on placebo.
• Aqualyx evidence is smaller. The main Aqualyx paper is a four-year Italian series of 186 patients, which focused on safety rather than measured fat loss.

5. How long does the swelling last after the injection?

Quick Answer: Swelling usually peaks over the first two or three days and settles within about three to five days, according to a 186-patient Aqualyx series. Bruising, tenderness and numbness are common. In Kybella trials, nine in ten treated patients had swelling. Plan sessions away from big events, and check your aesthetic clinic in Malaysia is MOH-registered before booking.

A typical course of recovery after one session looks like this:

• Day 0. Burning for a few minutes, then warmth and tightness.
• Days 1–3. Swelling and tenderness peak; the chin can look fuller than before.
• Days 3–7. Swelling eases. Itching may start, reported by 21.5% in the Aqualyx series.
• Weeks 2–8. Numbness or firmness can linger. The label notes numbness lasting over 30 days in 42% of treated patients.

Serious problems are rare but real. A 2024 review of US safety reports found skin necrosis, nerve weakness and swallowing trouble among the reported events, and Malaysia’s NPRA and Medical Device Authority regulate what may be used here.

6. Are the results of chin fat injections long-lasting?

Quick Answer: Yes for most people. In a follow-up of the REFINE trials, 82.4% of treated adults who had improved still held that improvement three years later. Fat cells broken down by a double chin fat melting injection do not grow back, but the remaining ones can still enlarge with weight gain. Our Aqualyx guide covers aftercare.

The three-year follow-up study enrolled only people who had already improved, so it shows durability, not the chance of improving in the first place. No new treatment-related side effects appeared during the follow-up.

For larger bulges elsewhere, the same logic applies. Our guide to tummy fat removal without surgery explains why injections suit small pockets and freezing suits bigger ones.

7. How much does a double chin fat melting injection cost in Malaysia?

Quick Answer: In the Klang Valley, an Aqualyx double chin fat melting injection typically starts from about RM 699 per session. A course of two sessions starts from about RM 1,400 and three from about RM 2,100. Larger or fuller chins need more vials, so the exact quote follows a consultation. Cooltech Define starts from about RM 800 per cycle.

Before you compare prices, ask three questions:

• How many vials or millilitres per session? A low per-session price can mean less product.
• How many sessions are planned? Compare the whole course, not one visit.
• Can I see the box and QR code? Counterfeit fat-dissolving products are on the market.

8. The short version

A double chin fat melting injection breaks down fat cells with a bile-acid compound, and the body clears them over the following weeks. It suits a small, soft pocket of fat in someone with a stable weight. Expect a few swollen days after each of two to three sessions, a moderate change that builds gradually, and results that usually hold. The doctor’s skill matters most: correct depth and a clear line below the jaw.

9. Frequently Asked Questions