Mesotherapy for Targeted Fat Reduction

Mesotherapy, the technique of injecting pharmaceutical compounds, vitamins, and other bioactive substances directly into the mesoderm (middle layer of the skin), has been practised in Europe since the 1950s, when it was developed by the French physician Dr Michel Pistor. In modern aesthetic medicine, mesotherapy has evolved to encompass a range of injectable fat reduction treatments that offer a non-surgical alternative to liposuction for patients with localised, resistant fat deposits. Clinics offer evidence-based mesotherapy protocols using approved formulations administered by trained practitioners.

The science of injectable lipolysis

Injection lipolysis, often referred to as mesotherapy for fat reduction, involves the direct injection of lipolytic (fat-dissolving) compounds into subcutaneous adipose tissue. The most well-studied agent is deoxycholic acid (DCA), a naturally occurring bile acid that emulsifies dietary fat in the gastrointestinal tract. When injected into subcutaneous fat, DCA destroys adipocyte cell membranes through a process of chemical lysis, releasing their lipid contents for subsequent clearance by the body’s inflammatory and lymphatic systems.

The mechanism was definitively described by Rotunda et al. (2004) in the Journal of the American Academy of Dermatology, who demonstrated through in vitro and in vivo studies that DCA produces rapid and specific destruction of adipocytes at injection sites, with predictable dose-response relationships. This research ultimately led to the development of ATX-101 (Kybella/Belkyra), the first injectable fat reduction treatment approved by the FDA and EMA.

Approved indications and treatment areas

The most extensively studied indication for injectable lipolysis is the reduction of submental fat (double chin). The Phase III clinical programme for ATX-101 included over 2,600 patients across 20 randomised controlled trials, making it one of the most rigorously tested aesthetic treatments available. Key findings published in Dermatologic Surgery (Jones et al., 2016) demonstrated:

• 79% of treated patients achieved at least a 1-grade improvement on the clinician-reported submental fat rating scale
• Significant improvements in patient-reported satisfaction with chin appearance
• Results were maintained for up to 5 years in long-term follow-up studies
• The destroyed fat cells do not regenerate, which gives permanent results with stable weight

Beyond the submental area, mesotherapy techniques are used off-label for localised fat deposits in areas including:

• Jowls and lower face fullness
• Bra fat and axillary fat pads
• Small abdominal fat deposits
• Inner knee and thigh areas
• Buffalo hump (dorsocervical fat pad)

Treatment process and what to expect

A typical fat-dissolving injection session involves the following stages:

Assessment: The treatment area is evaluated to confirm suitability. Ideal candidates have localised fat deposits with adequate skin elasticity. Patients with significant skin laxity may require alternative or additional treatments.

Treatment: The area is marked with a treatment grid and cleansed. The lipolytic solution is injected through multiple small injections spaced approximately 1cm apart. Each treatment session takes 15-30 minutes depending on the area.

Recovery: Swelling is the most significant post-treatment effect and can be substantial, particularly with submental treatments, where temporary “bullfrog” swelling is expected for 3-7 days. Other common effects include bruising, numbness, firmness, and mild pain in the treated area.

Course of treatment: Most patients require 2-4 treatment sessions spaced 6-8 weeks apart. The body gradually clears the disrupted fat cells through inflammatory and phagocytic processes over 4-6 weeks following each session.

Safety Considerations

Injectable lipolysis treatments have a well-characterised safety profile based on extensive clinical trial data. Common side effects are predictable and temporary: swelling, bruising, pain, numbness, and induration at the injection site. These are expected consequences of the adipocyte destruction process and resolve spontaneously.

Serious adverse events are rare but include marginal mandibular nerve injury (temporary in all reported cases in clinical trials), dysphagia (difficulty swallowing, when treating the submental area), and skin necrosis (extremely rare with proper technique). It is essential that these treatments are performed by practitioners with thorough knowledge of the relevant anatomy and experience in managing potential complications.

Mesotherapy vs other fat reduction methods

Understanding how mesotherapy compares to other non-surgical fat reduction technologies helps patients make informed treatment decisions:

• vs Cryolipolysiscryolipolysis treats larger areas per session and has less downtime, but mesotherapy offers more precise targeting and can treat areas difficult to access with cryolipolysis applicators
• vs Radiofrequency lipolysisRF-based fat reduction has the added benefit of skin tightening but typically requires more sessions for equivalent fat reduction
• vs Liposuctionsurgical liposuction removes significantly more fat and provides immediate results, but involves surgical risks, general anaesthesia, and longer recovery

Frequently asked questions

How much fat can mesotherapy remove?

Mesotherapy is designed for targeted reduction of small, localised fat deposits rather than significant volume removal. Clinical studies show an average fat layer reduction of 2-4mm per treatment session in the treated area. It is not a weight-loss treatment and works best for patients within a healthy weight range who have stubborn pockets of fat.

How long does the swelling last after fat-dissolving injections?

Swelling is most pronounced in the first 3-5 days after treatment and gradually subsides over 1-2 weeks. Submental treatments tend to produce the most noticeable swelling. Cold compresses and anti-inflammatory medication can help manage discomfort during the recovery period.

Are the results of fat-dissolving injections permanent?

Yes, the fat cells destroyed by the treatment do not regenerate. However, remaining fat cells in and around the treated area can still enlarge with significant weight gain. Maintaining a stable, healthy weight is important for preserving results long-term.

Who is not suitable for mesotherapy fat reduction?

Contraindications include pregnancy and breastfeeding, active infection in the treatment area, bleeding disorders, and allergy to deoxycholic acid. Patients with significant skin laxity may not be ideal candidates as fat reduction without skin tightening could worsen sagging. A thorough consultation assesses suitability before treatment.