If you have a stubborn pocket of fat that diet and exercise just won’t shift, two non-surgical treatments come up again and again: fat freezing and Aqualyx fat-dissolving injections. Both are designed to reduce localised fat without surgery, and both can permanently remove fat cells. But they work in very different ways, suit different areas of the body, and come with different downtime. This guide compares them honestly so you can have a more informed conversation at your consultation.
First, an important point that applies to both: neither treatment is a weight-loss solution. They are body contouring treatments for targeting specific, pinchable deposits — not a way to drop a dress size or lower your BMI. If significant weight loss is your goal, that’s a conversation for your GP first.
Fat freezing vs Aqualyx at a glance
| Feature | Fat Freezing (Cryolipolysis) | Aqualyx (Fat-Dissolving Injections) |
|---|---|---|
| How it works | Controlled cooling triggers fat cell death (apoptosis) | Deoxycholic acid dissolves fat cell membranes (adipocytolysis) |
| Permanent fat cell removal | Yes | Yes |
| Best for | Larger, well-defined, pinchable areas (flanks, abdomen, thighs) | Small precise pockets (chin, jowls, inner knees) |
| Delivery | External cooling applicator with suction | Series of injections into the fat |
| Sessions per area | 1–2 typically | 2–8 typically |
| Pain | Intense cold then numbness; suction sensation | Stinging or burning at injection sites |
| Visible social downtime | Minimal (1–3 days) | Moderate (swelling 5–14 days) |
| Time to see results | 8–12 weeks | Over 2–4+ sessions |
| Needles? | No | Yes |
| Typical UK cost | £99–£800+ per session | £180–£550+ per session |
How fat freezing works
Fat freezing, or cryolipolysis, uses precisely controlled cooling delivered through an applicator placed on the skin. Fat cells are more vulnerable to cold than the surrounding skin, nerves and muscle, so the cooling selectively triggers apoptosis — a tidy, programmed cell death — in the fat cells while leaving other tissue intact. Over the following weeks and months, your body clears the destroyed cells naturally through the lymphatic system.
Because the destroyed fat cells don’t regenerate, the results are permanent provided you keep your weight stable. Most people see a meaningful reduction in fat-layer thickness in a treated area from a single session, with full results visible at around three to four months. You can read more about what to realistically expect in our guide to fat freezing results.
The big practical advantages are that there are no needles and almost no social downtime — most people return to normal activities straight away, with only mild redness or tenderness for a day or two. You can learn more on our fat freezing treatment page.
How Aqualyx works
Aqualyx is an injectable solution containing a bile-acid derivative (sodium deoxycholate) that destroys fat cell membranes on contact, a process called adipocytolysis. It was developed in Italy by Professor Pasquale Motolese and received CE marking in Europe in 2012 — at the time, the only product approved in the EU specifically for the reduction of localised fat. It has since been used in dozens of countries and millions of treatments worldwide.
The treatment is delivered as a series of small injections directly into the fat pocket. Like fat freezing, the fat cell destruction is permanent. A 2025 study on the flanks reported an 86.7% improvement on a recognised aesthetic improvement scale — while total body weight stayed unchanged, neatly underlining that this is a localised, contouring treatment rather than weight loss. A 2023 meta-analysis likewise confirmed significant positive efficacy across the deoxycholic acid class.
Both treatments permanently remove fat cells — the real question isn’t “which destroys more fat” but “which suits the area you want to treat, your tolerance for downtime, and your feelings about needles”.
It’s worth being candid about the evidence base. Aqualyx has good observational data, small controlled trials and case series behind it, but it lacks the large-scale, blinded randomised trials that underpin cryolipolysis. That doesn’t mean it doesn’t work — it means a thorough consultation with realistic expectations matters all the more. You can find out more on our Aqualyx fat-dissolving injections page.
Pain, downtime and recovery
This is where the two treatments differ most in everyday terms.
Fat freezing feels intensely cold for the first few minutes, followed by numbness as the area acclimatises, plus a pulling sensation from the suction. Afterwards you may have some soreness, swelling and temporary numbness for a few days, but visible social downtime is minimal — typically one to three days.
Aqualyx involves stinging or a burning sensation as the solution is injected. The trade-off comes afterwards: deliberate inflammation is part of how it dissolves the fat, so swelling, tenderness and bruising are common and can be noticeable for 5–14 days, particularly around the chin and neck. Most people are advised to avoid strenuous activity for 24–48 hours. If you have an event coming up, plan accordingly.
Which areas suit which treatment?
The deciding factor is often simply the size and location of the area.
- Aqualyx tends to win for small, precise pockets — under the chin, jowls, the inner knees and other spots where a cooling applicator may not get good contact. Injections can be placed exactly where they’re needed.
- Fat freezing tends to win for larger, well-defined, pinchable areas — the flanks (“love handles”), abdomen and thighs — where an applicator can grasp a good amount of tissue in one go and treat the whole area efficiently.
If you dislike needles, fat freezing is the obvious choice. If you’re comfortable with injections and a bit of swelling in exchange for pinpoint targeting, Aqualyx may be ideal.
Cost and number of sessions
Both treatments usually require more than one visit, and pricing depends heavily on the area and the clinic.
| Aqualyx | Fat Freezing | |
|---|---|---|
| Chin / jowls | £180–£400 per session | £150–£500 per session |
| Single body area | £200–£550 per session | £99–£800 per session |
| Typical full course | £400–£2,000 (2–8 sessions) | £150–£1,600 (1–2 sessions) |
Fat freezing often works out at fewer sessions per area, while Aqualyx may need a longer course — something to factor in when comparing the total cost rather than the per-session price.
So which should you choose?
There’s no single winner. Both can deliver genuine, lasting reduction of a stubborn fat pocket, and both are body contouring rather than weight loss. As a rough guide:
- Choose fat freezing if you want to treat a larger pinchable area, prefer to avoid needles, and value minimal downtime.
- Choose Aqualyx if you’re targeting a small, precise pocket like a double chin and don’t mind injections or a week or so of swelling.
The honest answer is that suitability comes down to your individual anatomy, medical history and goals. If you’re still weighing up whether either is right for you at all, our guide on whether fat freezing is right for me is a good next read — and if you’re curious how injectable fat dissolving compares to the GLP-1 medications everyone’s talking about, see Mounjaro vs Aqualyx.
Ready to find out which suits you?
The best way to choose between fat freezing and Aqualyx is a proper consultation, where a practitioner can assess the area, talk through your medical history and set realistic expectations — no guarantees, just honest advice. If you’d like to explore controlled, non-surgical fat reduction for a stubborn area, take a look at our fat freezing treatment page or book a consultation to discuss the option that genuinely fits you.
