What Are Fat Dissolving Injections?
Stubborn pockets of fat — beneath the chin, along the jawline, or on the upper arms — often persist regardless of how carefully someone eats or exercises.
Fat dissolving injections, also called lipolytic injections or injection lipolysis, offer a non-surgical way to target these localised deposits without general anaesthesia or a surgical recovery period. For English-speaking patients in Tokyo, they are among the most-requested aesthetic procedures at cosmetic clinics across the city.
This article explains how fat dissolving injections work, which face and body areas can be treated, what clinical studies say about outcomes, and what the procedure costs in Tokyo.
- How fat dissolving injections break down fat cells at a cellular level
- Which face and body areas are suitable for treatment in Tokyo
- How many sessions are typically needed and what downtime to expect
- What affects the cost of fat dissolving injections in Tokyo
- Who is — and is not — an appropriate candidate
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
How Fat Dissolving Injections Work
Most fat dissolving formulas rely on two compounds: phosphatidylcholine (PC) and deoxycholic acid (DCA).
Deoxycholic acid is a bile acid produced naturally by the human body to emulsify dietary fats. When injected into subcutaneous fat tissue, it disrupts the outer membranes of adipocytes (fat cells), causing them to rupture and release their lipid contents. The body then processes and eliminates this material through the lymphatic and circulatory systems over the following weeks.
In Japan, the most commonly used products belong to the BNLS family — BNLS Neo and BNLS Ultimate — which combine plant-derived phosphatidylcholine with anti-inflammatory and skin-firming agents. These formulas are widely favoured in Japanese clinics for delicate facial work because of their relatively mild swelling profile. Kabelline and comparable deoxycholic acid-dominant injectables are also available and are often selected for denser or larger fat deposits.
A regulatory note relevant to patients in Japan: none of the fat dissolving injectable products currently available at Tokyo cosmetic clinics hold approval from Japan’s Pharmaceuticals and Medical Devices Agency (PMDA). They are offered as entirely self-pay aesthetic treatments (自由診療), sourced through legal private import channels.
In the United States, the synthetic deoxycholic acid product Kybella holds FDA approval for moderate-to-severe submental fullness in adults — this US approval does not extend to Japan and should not be taken as a guarantee of safety or efficacy in other indications or other countries.
Areas Treated: Face and Body
Fat dissolving injections can address a range of localised fat deposits. The areas most commonly treated at Tokyo cosmetic clinics are:
Face and Neck
- Submental fat (double chin) — the area with the strongest published clinical evidence
- Jowls and lower jawline — to sharpen definition along the lower face
- Buccal (cheek) fat — for patients seeking a slimmer facial contour
Body
- Upper arms
- Abdomen and lower abdomen
- Flanks and love handles
- Back fat (including the bra-strap area)
- Inner and outer thighs
- Inner knees
The choice of formula often varies by area and the density of the fat involved. The table below summarises the two main product categories available at Tokyo aesthetic clinics.
| Feature | BNLS Neo / BNLS Ultimate | Deoxycholic Acid Formula (e.g. Kabelline) |
|---|---|---|
| Main active agent | Plant-based phosphatidylcholine blend + anti-inflammatory agents | Synthetic deoxycholic acid |
| Best suited for | Delicate facial areas; patients with lower tolerance for swelling | Chin, jawline, and body areas with denser fat deposits |
| Typical sessions needed | 3–6 sessions, 1–2 weeks apart | 2–4 sessions, 2–4 weeks apart |
| Typical post-treatment swelling | Mild, 2–5 days | Moderate, 3–7 days |
| PMDA approval status (Japan) | Not approved — self-pay only | Not approved — self-pay only |
Cost of Fat Dissolving Injections in Tokyo
Fat dissolving injections in Tokyo are priced entirely on a self-pay basis; Japanese National Health Insurance does not cover cosmetic aesthetic procedures. The total cost of a course of treatment depends on several variables: the specific product used, the number of vials required per session, the treatment area (facial work typically requires fewer vials than the abdomen or flanks), and the total number of sessions in the course.
Because most patients need between three and six sessions to complete a course, the per-session price should be multiplied by the expected number of visits to arrive at a realistic total investment. Larger body areas and denser fat deposits require more product per session and usually more sessions overall than smaller facial areas.
Pricing at BIOTOPE CLINIC is subject to change. Please see the clinic’s official price page or contact us directly for a current quote before booking.
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
What to Expect: Before, During and After
Before Treatment
A physician consultation is required before treatment begins. The doctor assesses the target area, skin laxity, fat depth, and overall suitability, and confirms which product and protocol is most appropriate. Patients are typically advised to avoid aspirin, non-steroidal anti-inflammatory drugs (NSAIDs), fish oil, and vitamin E supplements for approximately one week before the appointment to reduce the risk of bruising.
During the Procedure
A topical anaesthetic cream is applied to the treatment area before the injections. The physician administers a series of small injections using a fine needle across the target zone. Session length ranges from roughly fifteen minutes for a facial area to forty-five minutes or more for a larger body region.
After Treatment: Recovery and Downtime
Swelling is the most predictable side effect. In a published study of 221 patients treated across 273 body locations, oedema within 72 hours was reported in 78% of cases, mild pain in 60%, bruising in 41%, and temporary numbness in 30% (Amore et al., Plastic and Reconstructive Surgery Global Open, 2018). The majority of these effects resolved without intervention. Prolonged swelling beyond 72 hours occurred in approximately 2% of patients; permanent nodules in under 1%; and skin irregularities in 0.5% of cases.
A five-year systematic review and meta-analysis of five randomised controlled trials involving 1,837 patients found that temporary nerve effects affecting the marginal mandibular nerve occurred in 2.1% of chin-area patients, with all cases resolving fully during the study period (Inocêncio et al., Clinics (Sao Paulo), 2023).
Patients should avoid strenuous exercise, alcohol, and direct sun exposure on treated areas for the first 48–72 hours post-treatment. Results develop over four to eight weeks as the lymphatic system clears disrupted fat cells; meaningful change is typically visible from the third session onward.
Who Is a Good Candidate?
Fat dissolving injections are specifically designed for localised fat reduction, not whole-body weight loss. The best outcomes are seen in patients who:
- Are at or near their target weight, with discrete pockets of fat that do not respond to diet and exercise
- Have good skin elasticity in the target area, allowing the skin to adapt as fat volume reduces
- Hold realistic expectations about gradual results over a course of treatment
- Are in good general health with no active infection at the treatment site
Fat dissolving injections are not suitable for people who are pregnant or breastfeeding, those taking anticoagulant medication, anyone with a known allergy to the injection ingredients, or those seeking large-volume fat removal. Physician assessment before any treatment is essential.
Common Misconceptions About Fat Dissolving Injections
Misconception 1: “Fat dissolving injections are a weight-loss treatment”
This is the most common misunderstanding. These injections target localised subcutaneous fat deposits — not overall body composition. The 2023 meta-analysis by Inocêncio et al. evaluated deoxycholic acid injections on localised volume improvement and patient-reported satisfaction with appearance, not on scale weight. Patients with significant overall excess body fat are unlikely to see clinically meaningful results and are better guided toward lifestyle intervention or other medical options first.
Misconception 2: “One session delivers the full result”
Social media posts often feature dramatic before-and-after images without disclosing how many sessions were required. The clinical literature is consistent: a study by Amore et al. (2018) found that treated body areas received an average of 3.14 injection sessions before final outcomes were assessed. The reported treatment success rate of 93.5% reflects the result of a complete course, not a single appointment.
Where to Get Fat Dissolving Injections in Tokyo
Within our clinic group, both BIOTOPE CLINIC (Shirokanedai, Minato-ku) and Kojimachi Dermatology & Plastic Surgery Clinic (Ichigaya, Chiyoda-ku) offer English-language consultation with Dr. Jun Karibe’s team. Fat dissolving injections, as a cosmetic body contouring treatment, are handled at BIOTOPE CLINIC in Shirokanedai. Bookings and enquiries in English: LINE or WhatsApp.
For patients interested in combining fat reduction with skin tightening, BIOTOPE CLINIC also offers Embrace RF and Morpheus8 (radiofrequency microneedling) as complementary treatments that can address skin laxity in the same area — a combination that can be discussed during consultation with Dr. Karibe.
Frequently Asked Questions
- Q. Are fat dissolving injections painful?
- Most patients experience mild-to-moderate discomfort during the injections. Topical anaesthetic cream is applied beforehand to reduce the sensation. Post-treatment soreness typically resolves within one to two days. In published clinical data, pain was reported in around 60% of patients receiving deoxycholic acid, but lasted a median of only one day.
- Q. How many sessions will I need?
- The number of sessions depends on the area being treated and the amount of fat present. Clinical studies report an average of approximately three sessions per treatment area across a range of body locations. Facial areas such as the double chin typically need three to four sessions spaced two to four weeks apart; larger body regions may require up to six. A personalised estimate is given at consultation.
- Q. Are results permanent?
- Fat cells that have been destroyed by the injection do not regenerate. In that sense, the reduction in fat cell number is long-lasting. However, significant weight gain after treatment can cause the remaining fat cells in the area to enlarge, reducing the visible benefit. Maintaining a stable weight after treatment supports lasting results.
- Q. Can fat dissolving injections be combined with other treatments?
- Yes. For patients concerned about both localised fat and skin laxity, injectable lipolysis can be combined with radiofrequency or microneedling treatments in a planned treatment course. The appropriate combination and sequence is determined during physician consultation at BIOTOPE CLINIC.
- Q. Are these injections covered by health insurance in Japan?
- No. Fat dissolving injections are a cosmetic aesthetic treatment and are not covered by Japan’s National Health Insurance. All costs are the patient’s responsibility on a self-pay basis (自由診療).
Have a question about this treatment?
Message us on LINE or WhatsApp — our English-speaking team usually replies the same day.
Summary
Fat dissolving injections provide a non-surgical option for reducing localised fat pockets in the face and body. Clinical studies suggest meaningful success rates when a complete course of treatment is followed, with a 93.5% physician-assessed success rate reported across 9 body areas in one prospective study, and patient satisfaction approximately twice that of placebo in a large meta-analysis of submental fat treatment.
Results develop gradually, most patients see visible change from the third session onward, and the side-effect profile — primarily temporary swelling, mild pain, and bruising — is predictable and generally self-resolving.
These injections are most appropriate for patients at or near their target weight with specific, stubborn fat deposits. They are not a substitute for weight management, and thorough physician assessment before treatment is essential.
If you have questions about fat dissolving injections in Tokyo, both BIOTOPE CLINIC (Shirokanedai, Minato-ku) and Kojimachi Dermatology & Plastic Surgery Clinic (Ichigaya, Chiyoda-ku) offer English-language consultation with Dr. Karibe and his team. Fat dissolving injections are primarily handled at BIOTOPE CLINIC in Shirokanedai. English enquiries: LINE or WhatsApp.
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References
- Inocêncio GSG, Meneses-Santos D, Costa MDMA, Vieira WA, Almeida VL, Rodrigues RPCB, Rode SM, Paranhos LR. Efficacy, safety, and potential industry bias in using deoxycholic acid for submental fat reduction — a systematic review and meta-analysis of randomized clinical trials. Clinics (Sao Paulo). 2023;78:100220.
- Amore R, Amuso D, Leonardi V, Leva F, Sibaud AC, Guida A, Costa E, Terranova F, Amodeo V, Gkritzalas K. Evaluation of safety and effectiveness of an injectable deoxycholic acid-based solution for reduction of localized adiposities. Plastic and Reconstructive Surgery Global Open. 2018;6(6).
- U.S. Food and Drug Administration. Using fat-dissolving injections that are not FDA-approved can be harmful. U.S. Department of Health and Human Services. https://www.fda.gov/drugs/buying-using-medicine-safely/using-fat-dissolving-injections-are-not-fda-approved-can-be-harmful
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- BNLS Fat Dissolving Tokyo: Results, Sessions & Cost
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- Fat Dissolving for Belly Tokyo: Results Guide
- Fat Dissolving for Thighs and Arms Tokyo: Treatment Guide
- GLP-1 vs Fat Dissolving vs Liposuction Tokyo
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