Are Fat Dissolving Injections Safe?

Dr Hasaneen Al Janabi MBBS MRCS (ENT) - Dr Hass Clinic Founder & Medical Director

Published by Dr Hasaneen

Published date 10.06.26

Yes — fat dissolving injections are safe when administered by a qualified medical professional using a regulated product. The active ingredient, deoxycholic acid, has an established clinical track record and has been studied in thousands of patients across multiple peer-reviewed trials.

Like all injectable treatments, the safety profile is closely tied to who performs the treatment and how. This article covers what the evidence shows, what side effects to expect, when fat dissolving is not appropriate, and what separates a safe treatment from a risky one.

Is Fat Dissolving Safe? - Dr Hass Clinic

What is in fat dissolving injections?

At Dr Hass Clinic, we use Aqualyx — a CE-marked injectable solution whose active ingredient is deoxycholic acid. This is a bile acid produced naturally by the body to help break down dietary fats in the digestive system. When injected into a localised fat deposit, it disrupts the membrane of fat cells, causing them to break down. The body then clears the debris through the lymphatic system over the following weeks.

Because deoxycholic acid is rapidly inactivated on contact with surrounding tissue protein, its action stays spatially contained. It does not migrate freely through the body — a key part of why its safety profile is well-established.

It is worth distinguishing Aqualyx from unregulated alternatives such as Lemon Bottle, which lack comparable clinical evidence and regulatory oversight. Not all fat dissolving products carry the same safety record.

What does the clinical evidence say?

Deoxycholic acid is one of the better-studied injectable compounds in aesthetic medicine. The evidence covers both efficacy and safety, with consistent findings across different study designs and patient populations.

A systematic review and meta-analysis published in the Expert Review of Clinical Pharmacology (Cunha et al., 2021), incorporating data from five randomised controlled trials and 1,838 participants, found that deoxycholic acid produced statistically significant improvements across all efficacy measures compared to placebo. Withdrawal rates due to adverse events were low at the standard dose, and the authors reported no clinically significant changes in liver or kidney function.

A separate systematic review published in Dermatologic Surgery (Pham et al., 2020), which analysed 28 published studies on the adverse event profile of deoxycholic acid, concluded that the large majority of patients experienced only mild, localised side effects that resolved on their own. Severe long-term adverse events were reported as rare across the evaluated literature.

Together, this research supports fat dissolving as a safe treatment for localised fat reduction when correctly administered — not a claim of zero risk, but a treatment with a well-characterised and manageable safety profile.

Fat Dissolving Injections - Treatment at Dr Hass Clinic

What are the common side effects?

Side effects after fat dissolving are normal, predictable, and in the vast majority of cases resolve without intervention. They are a direct consequence of the inflammatory process that breaks down fat cells — in other words, they are signs the treatment is working.

  • Swelling — the most significant side effect, peaking at 24 to 72 hours and settling within 1 to 2 weeks
  • Tenderness and sensitivity — typically subsides within a few days
  • Bruising — may appear from day 2 and fades over 5 to 10 days
  • Redness and warmth — a normal inflammatory response, usually resolves within 24 to 48 hours
  • Firmness or lumpiness under the skin — temporary, resolves as healing progresses within 2 to 4 weeks
  • Numbness — experienced by some patients, typically transient

For a detailed breakdown of what to expect day by day, see our fat dissolving recovery and aftercare guide.

What are the rare but serious risks?

Serious complications from fat dissolving are uncommon, but understanding them is part of making an informed decision.

  • Nerve injury — the marginal mandibular nerve is a documented risk when treating the chin and lower face. In clinical trials, temporary muscle weakness was reported in a small number of patients and resolved without lasting effects in all cases. The risk is significantly reduced when treatment is performed by an anatomy-trained medical professional.
  • Infection — a small risk with any injectable treatment. Strict aseptic technique and proper patient selection make this rare.
  • Skin necrosis — very rare, and typically associated with incorrect injection depth or compromised blood supply in the treated area.
  • Alopecia — reported in a small number of cases in the literature, predominantly where injections were performed near the scalp.
  • Allergic reaction — uncommon but possible, as with any injectable substance.

The common thread across serious complications is that most are associated with incorrect technique, inappropriate patient selection, or unregulated products administered by insufficiently trained practitioners. They are not an inevitable feature of the treatment.

How Many Fat Dissolving Sessions Will I Need? - Dr Hass Clinic

Who should not have fat dissolving injections?

A thorough consultation and medical history review must always take place before treatment. Fat dissolving is not recommended for people who:

  • Are pregnant or breastfeeding
  • Have active skin infections or inflammation in the treatment area
  • Have lipodystrophy or conditions affecting how the body processes fat
  • Are significantly overweight — this is a contouring treatment, not a weight loss solution
  • Have poor skin laxity in the treatment area — removing volume without sufficient elasticity can lead to sagging
  • Are taking blood thinners or have clotting disorders
  • Have a known allergy to any component of the product

Identifying these contraindications is one of the primary purposes of the consultation. Skipping this step is a clear sign of a clinic operating below appropriate standards.

Why practitioner qualifications matter most

The single most important safety factor is the person performing the treatment. The risks associated with nerve injury, skin necrosis, and incorrect injection depth are predominantly technique-dependent. They are not an inherent risk of the active ingredient — they are a consequence of inadequate training or experience.

Understanding the anatomy of a treatment area — the depth of fat deposits, proximity to nerves, vascular structures — is not something that comes from a short training course. It comes from a medical background in which anatomy is foundational.

At Dr Hass Clinic, all fat dissolving treatments are performed by GMC-registered doctors with a surgical background. Fat dissolving is increasingly offered in the UK by practitioners without medical qualifications. This is where the real risk in the market lies. The treatment itself is well-evidenced and safe; unqualified delivery is not.

Consultation at Dr Hass Clinic

Questions to ask before your treatment

Before proceeding with fat dissolving at any clinic, it is reasonable to ask:

  • What product are you using and is it CE-marked?
  • What are your medical qualifications?
  • How many fat dissolving treatments have you performed?
  • What would you do if I experienced a complication?
  • Is a medical professional available if something goes wrong?

A reputable clinic will answer all of these clearly and without hesitation. If answers are vague or defensive, that is important information.

Refining Treatment at Dr Hass Clinic

Why is fat dissolving safe at Dr Hass Clinic?

At Dr Hass Clinic, fat dissolving is performed by Dr Hasaneen — a GMC-registered surgeon with extensive experience in facial and body anatomy. Every patient undergoes a thorough consultation before treatment, during which suitability is assessed, contraindications are checked, and a realistic treatment plan is discussed. We use Aqualyx exclusively, and we do not offer unregulated fat dissolving products.

Our approach is built on the principle that the quality of care matters as much as the quality of the product. If fat dissolving is not the right treatment for you, we will tell you — and recommend what is.

Ready to find out if fat dissolving is right for you?

Book a consultation at Dr Hass Clinic and receive an honest, personalised assessment from a GMC-registered surgeon.

Latest News

Don’t Take Our Word For it…

EXCELLENT
Trustindex star 1Trustindex star 2Trustindex star 3Trustindex star 4Trustindex star 5
Based on 332 reviews
Posted on Google Google
Will Blackwell profile picture
Will Blackwell
1 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
10/10 so happy with results!!!! Would definitely recommend. With Dr Hass
Posted on Google Google
S G profile picture
S G
4 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I had my Endolift treatment with Dr Hass and couldn’t be happier with my experience. From the initial consultation through to the treatment itself, I felt reassured and well looked after. Dr Hass was professional, knowledgeable and took the time to explain everything clearly, which made me feel at ease throughout. I wanted a subtle, natural-looking result rather than anything drastic, and I felt confident that Dr Hass understood exactly what I was hoping to achieve. The whole experience was positive, and I’m really pleased with the care and attention I received. I would highly recommend Dr Hass to anyone considering Endolift and looking for a professional, reassuring experience.
Posted on Google Google
samira Fleur profile picture
samira Fleur
7 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Dr Hass is a guarantee of excellence. He consistently meets expectations by delivering beautiful, natural-looking results. His professionalism, expertise, and attention to detail make you feel confident that you are in the best hands. I couldn’t recommend the clinic more highly!
Posted on Google Google
Nikol Rosenbergova profile picture
Nikol Rosenbergova
7 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I recently went to Dr. Hass at Dr. Hass Clinic for an Endolift treatment, and I honestly couldn't be happier with the results! I had quite a bit of sagging skin, especially around my neck and lower face. The moment the procedure was done, I could immediately feel the tightening effect. The results were amazing right away the sagging on my neck completely disappeared, and my facial contours were lifted instantly. Dr. Hass is wonderful, so kind, and extremely professional. He explained everything in detail and took his time to focus precisely on the sagging areas where I needed it the most. I am so satisfied with my experience, I will definitely come back in the future, and I highly recommend him to anyone struggling with similar issues. He is truly one of the best, and I am so glad I found him and chose him!
Posted on Google Google
Zoe Lee profile picture
Zoe Lee
7 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Dr Hass is very professional and gentle during the procedure and very great follow up when I get in contact with him for advice. Also the clinic itself is very nice tidy and clean so Highly recommend!
Posted on Google Google
Zoya Fiaz profile picture
Zoya Fiaz
8 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I had my nose filler done by Dr. Hass, and I couldn’t be happier with the results! His knowledge, expertise and attention to detail were evident straight after the treatment. He understood exactly what I wanted to achieve and delivered the results I was hoping for. He also took the time to guide me through the process and advise me on the best approach to suit my nose and desired outcome. I’m extremely happy and satisfied with my results and would highly recommend Dr. Hass to anyone considering aesthetic treatments.
Posted on Google Google
Baylie-Bleu M profile picture
Baylie-Bleu M
9 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Visited today and had an amazing service and generally felt So comfortable, treatment was explained properly and we picked together which was best suited for my skin Very happy and will 100% recommend
Posted on Google Google
Lia Maria profile picture
Lia Maria
18 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I 100% recommends visiting Dr Hass clinic. Dr Hass is very friendly and a pro at what he does. I got facial balancing and he took his time analysing my face, I’m super happy with the results, very natural looking!
Posted on Google Google
Maya Ansar profile picture
Maya Ansar
23 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
A very good experience. Dr Hass was professional, thorough and took the time to assess my face properly. The face mapping was very detailed, everything was explained clearly, and the recommendations felt considered rather than rushed. I felt very comfortable throughout.
Posted on Google Google
Lekaa Saleh profile picture
Lekaa Saleh
25 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I am a lady in my early 50s I was very confused to choose a clinic that can remove my double chin which was really annoying me and making me lose my confidence. I finally found Dr. Hass clinic. I am a person who doesn’t like surgeries or injections.. I was very worried but Dr Hass was a very experienced professional doctor who made me feel comfortable and relaxed. I personally didn’t feel any pain and when I saw the result I was amazed with the beautiful change … No more double chin 🥹🥹 It’s very important for all women to invest in their health and beauty.. I strongly recommend Dr Hass clinic and I would love to make another visit for different treatments 😊 Dr Hass you really changed my life by increasing my self confidence thank you so so much for everything 🥹🙏🏼🌹
Posted on Google Google
Ambar Mirza profile picture
Ambar Mirza
29 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I’ve been coming to Dr Hass for a long time now and I honestly wouldn’t trust anyone else with my filler. He always makes me feel completely at ease and really takes the time to listen to what I want, while also giving genuinely helpful and honest advice. He’s brilliant at what he does, couldn’t recommend him enough!
Posted on Google Google
jenai douglas profile picture
jenai douglas
30 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
I visited Dr Hass for dermal fillers and it was my best experience to date. Dr Hass took time during the consultation to really ask questions to understand my needs and make the best recommendations for me to achieve my desired results. He was honest and personable and even advised me against treatments I thought I needed due to seeing others have these procedures online. He really cared about my results and being satisfied over anything else. I was nervous but he put me at ease and the results are amazing. Cannot recommend the clinic enough and I will be back!
Posted on Trustindex Trustindex
Nikol profile picture
Nikol
31 days ago
Trustindex star 1Trustindex star 2Trustindex star 3Trustindex star 4Trustindex star 5Trustindex verifies that the original source of the review is Trustindex.
Endolift A huge thank you to Dr. Haas! I had a big issue with sagging skin, especially on my neck, so I decided to get an Endolift for my face with an extended neck treatment. I saw the results immediately after the procedure—my skin was tightened, my facial contours were much more defined, and everything looked so beautiful and natural. I am extremely satisfied, the clinic is clean and gorgeous, and everyone there is so kind. Dr. Haas is truly one of the best doctors, and I highly recommend him to everyone!
Posted on Google Google
lola ri profile picture
lola ri
31 days ago
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Dr Hass is truly magical! He has an incredible eye and knows exactly what your face needs to create the perfect contour while keeping everything natural and beautifully balanced. His skill and attention to detail are exceptional I couldn’t be happier with the result. I highly recommend him!
Posted on Trustindex Trustindex
Caroline Wingfield profile picture
Caroline Wingfield
38 days ago
Trustindex star 1Trustindex star 2Trustindex star 3Trustindex star 4Trustindex star 5Trustindex verifies that the original source of the review is Trustindex.
Lips I would thoroughly recommend Dr Hass and his clinic. He is incredibly thorough, professional and, most importantly, honest in his approach. Having visited a number of different clinics over the years, what really sets Dr Hass apart is his focus on achieving a softer, fresher and more natural look rather than making you look “done”. He has completely transformed years of previous lip filler for me, and my lips already look amazing — beautifully natural and so much better balanced. I’ve had so many people notice the difference and comment on how good they look. I couldn’t be happier with the results and wouldn’t hesitate to recommend him.

Our clients’ satisfaction is at the heart of everything we do. We take immense pride in helping individuals enhance their natural beauty and boost their confidence.

Dr Hass Surgeon-led Aesthetic Clinic Mayfair Waiting Area Dr Hass Clinic - Luxury Aesthetic Clinic Mayfair

Our Clinic

Your Sanctuary

Welcome to our clinic, where innovation, expertise, and personalised care merge to redefine your natural beauty. We specialise in providing a wide range of non-invasive treatments that deliver remarkable results without the need for surgery.

Call us — 020 8168 8178

or