Skin Care Education

Fat Dissolving Injections

Injectable treatments that permanently destroy fat cells in targeted areas of the face and body. Most commonly used beneath the chin and along the jawline, with results that develop gradually over several weeks.

What Are Fat Dissolving Injections?

Fat dissolving injections are injectable treatments that use a solution to break down and permanently destroy fat cells in a specific area. The most widely used active ingredient is deoxycholic acid, a substance that occurs naturally in the body and plays a role in the digestion and absorption of dietary fat. When injected directly into a fat deposit, it disrupts the membrane of the fat cells, causing them to break down. The body then gradually clears away the destroyed cells over the following weeks through its natural waste removal processes.

The most common application in aesthetic practice is the treatment of submental fat, the fat deposit beneath the chin that creates the appearance of a double chin. This area is particularly well suited to fat dissolving injections because the submental fat deposit is accessible, localised, and frequently resistant to reduction through diet and exercise. The treatment is also used in other areas of the face and body, including the jowls, the bra line, the inner knees, and small localised fat pockets elsewhere on the body, though the submental area remains the most established and most commonly treated zone.

Fat dissolving injections permanently eliminate the treated fat cells. Once destroyed, those specific cells do not return. However, the remaining fat cells in the area and throughout the body can still expand if weight is gained, so maintaining a stable weight after treatment is important for preserving the result over time.

What to Expect

The treatment involves multiple small injections placed precisely throughout the fat deposit. A topical numbing cream is applied beforehand, but the injections do involve a notable burning or stinging sensation as the solution enters the tissue. This is a known characteristic of the treatment and typically settles within 15 to 30 minutes of the session ending.

After treatment, significant swelling in the treated area is normal and expected. For submental fat treatment, the under-chin area can swell considerably for one to two weeks, during which the area will look and feel very different from the final result. The swelling is a sign that the treatment is working, as the inflammatory response it creates is part of the fat cell destruction process. Redness, bruising, firmness, and numbness in the treated area are all common in the days and weeks following treatment.

Results are not visible immediately and develop gradually as the swelling resolves and the body clears the destroyed fat cells. Most people begin to see a noticeable change in the treated area from around four to six weeks after treatment, with the full result typically visible at three months. Multiple sessions are usually needed to achieve the desired reduction, with most people requiring two to four treatments spaced six to eight weeks apart.

Who It’s For and Results

Fat dissolving injections are best suited to people who have a specific, localised fat deposit they want to address and who are at or near a healthy weight overall. They are not a weight loss treatment and are not appropriate for treating large volumes of fat. The ideal candidate has a clearly defined area of stubborn fat that has not responded to lifestyle changes.

They are particularly well suited to those with submental fat who do not want or are not ready for surgery, who are not candidates for fat freezing in this area due to the size or position of the deposit, or who want a non-surgical alternative to a chin liposuction procedure.

When performed on appropriate candidates with realistic expectations, fat dissolving injections produce a meaningful and permanent reduction in the treated area. The chin and neck profile becomes cleaner and more defined, with results that, once fully developed and with stable weight, are long-lasting. The expected downtime and the gradual nature of the results are important to understand before treatment, as the recovery period is more noticeable than many other non-surgical aesthetic treatments.

Frequently Asked Questions: Fat Dissolving Injections

Most people require two to four sessions to achieve their desired result, spaced six to eight weeks apart to allow adequate healing and assessment between treatments. The number of sessions depends on the size of the fat deposit, the individual’s response to treatment, and the degree of reduction being sought. Some people see a satisfying result after two sessions. Others with larger deposits or more significant goals may benefit from additional treatments. A provider will assess the area after each session and recommend whether further treatment is needed based on the result achieved so far.

The specific fat cells that are destroyed by the treatment are permanently eliminated and do not regenerate. However, if significant weight is gained after treatment, the remaining fat cells in the area can expand and the treated area can look fuller again. The result is therefore permanent in terms of the cells destroyed, but is not immune to the effects of weight gain. Maintaining a stable weight after completing treatment is the most reliable way to preserve the result long term.

Fat dissolving injections are one of the more uncomfortable non-surgical aesthetic treatments. The solution itself causes a burning sensation as it enters the fat tissue, which is a known characteristic of the product. Numbing cream applied beforehand helps, but does not eliminate the sensation entirely. Most people describe the treatment as tolerable but notably uncomfortable during the procedure and for a short period after. The significant swelling that follows is also something to prepare for. Understanding what to expect before booking helps manage expectations around both the procedure experience and the recovery period.

Fat dissolving injections can be used in various areas beyond the chin, including the jowls, the area under the buttocks, the inner knees, the bra roll, and other small localised fat deposits. However, the submental area beneath the chin is the most established and most extensively studied application, and results in other areas can be more variable. Not all providers offer fat dissolving injections in body areas beyond the chin, and suitability for treatment in different areas should be assessed on an individual basis. The treatment is not appropriate for large surface areas or significant volumes of fat.