Non-surgical BBL: which bum lift options actually work?

TL;DR

• “Non-surgical BBL” can mean two very different things: a liquid filler injection into the buttocks, or external device treatments that firm and contour the skin.
• Filler injected into the buttocks is classed as surgical by the JCCP, is linked to deaths and serious complications in the UK, and is proposed for doctor-only restriction. CoLaz does not offer it.
• Device-based treatments (radiofrequency, vacuum and ultrasound) can help firm skin and soften the look of cellulite, but they do not add volume the way fat transfer or implants do.
• Fat freezing can refine nearby pockets such as the flanks or outer thighs, but it does not lift or enlarge the buttocks, and it has its own rare risks.
• The honest route starts with a free consultation, a realistic goal and a written plan, and sometimes the answer is that surgery with a properly qualified surgeon is the only way to get the change you want.

If you have searched for a non-surgical BBL, you will have seen two very different things sold under the same name. One is a risky injection. The other is a gentle skin-firming treatment that does far less than the photos suggest. This guide explains the difference, what the evidence says, and what you can realistically expect without an operating table.

What does “non-surgical BBL” actually mean?

A non-surgical BBL (Brazilian bum lift) is a loose marketing label, and it covers two completely different approaches: injecting filler into the buttocks, or using external devices on the skin.

The first is often called a “liquid BBL”. Save Face, the government-approved register of non-surgical practitioners, describes it as sold as a safer option to surgery, yet with a high risk of complications. It is an injection of filler, reported to use large volumes, so it is neither gentle nor low risk.

The second approach uses radiofrequency, vacuum suction or ultrasound applied from the outside. There are no needles and no filler. These treatments aim to firm, tone and smooth the skin over the buttocks and upper thighs. They are what CoLaz offers, and they work in a very different way from either filler or surgery.

Knowing which one a clinic means is the first question to ask. If the answer involves injecting anything into the buttocks, read the next two sections carefully.

Why is the surgical BBL such a concern?

The surgical BBL is a concern because NHS England states that it has the highest death rate of all cosmetic procedures, and the main cause is fat entering a blood vessel and travelling to the lungs.

In a surgical BBL, fat is removed from one part of the body by liposuction and injected into the buttocks. The danger is a fat embolism: fat entering the large veins in and under the buttock muscle. The Aesthetic Society notes that most board-certified aesthetic plastic surgeons have never had a patient with this complication, but that it can be fatal when it occurs. It also warns that fat absorption can be as much as 40%, which may cause asymmetry and sometimes means repeat sessions.

To be fair, the picture has improved. The BAAPS review of gluteal fat grafting notes that the risk was once reported as 1 in 2,500, but estimates it is nearer 1 in 15,000 when modern technique is followed, similar to abdominoplasty (a tummy tuck). That relies on fat being placed above the muscle, with ultrasound guidance, by a trained surgeon.

The risk climbs when those conditions are missing. A House of Commons committee estimates that 524,000 UK residents travelled abroad for medical treatment in 2024, including buttock lifts. The government’s travel safety campaign warns that a low price can come at a high cost, and asks one vital question: if it goes wrong, who will fix it? The FCDO has also updated its travel advice for anyone going abroad for cosmetic treatment.

Is a filler bum lift a safe BBL alternative?

No. Injecting filler into the buttocks is not a safe alternative to surgery, and UK experts now classify it as a surgical procedure in its own right.

The JCCP guidance says that any procedure designed for buttock, breast or genital augmentation using dermal fillers or grafted fat should be considered surgical. It was written for local authorities after reports of serious harm caused by untrained practitioners.

The same message comes from the regulators. The government announced that the highest-risk procedures, such as non-surgical Brazilian butt lifts, must be done by qualified healthcare professionals working in providers registered with the Care Quality Commission. Its draft regulations, now out for consultation, specify that filler injected anywhere other than the face counts as a surgical procedure, which would restrict it to doctors. The same document refers to the death of Alice Webb in 2024 after a liquid BBL in the UK, which prompted widespread calls for action.

Save Face reports an average cost of over £2,000 per treatment, and that 96% of patients who reported complications to it ended up treated by NHS services. That is why this is not an option we would ever recommend.

At CoLaz, dermal fillers are hyaluronic-acid treatments for the face, such as the lips, jawline, chin and nasolabial lines. We do not inject filler into the buttocks, breasts or genitals.

What can a non-surgical bum lift with devices realistically do?

A device-based non-surgical bum lift can firm and smooth the skin and soften the look of cellulite, but it cannot add volume or create a new shape.

The Brazilian bum lift at CoLaz combines three external technologies. Radiofrequency heats the deeper layers of skin to stimulate collagen. A vacuum handpiece lifts and mobilises the tissue. Ultrasound cavitation finishes the session to refine the surface. A session takes around 60 minutes, and there is no anaesthetic and no real downtime.

What does the research say? A review of body contouring devices found radiofrequency is widely used for tightening and cellulite, with patient satisfaction for fat reduction reported at around 71% to 97%. It also found that significant statistical evidence for skin laxity and cellulite was limited, and that there is no standard treatment protocol. Another RF study, which combined radiofrequency with targeted pressure energy, found 86% of participants were satisfied with their cellulite appearance and 82% reported improved skin laxity, with no severe side effects.

So the realistic summary is modest. Most patients see firmer, smoother skin and a modestly more sculpted look in clothes. Patients with mild laxity, dimpling or a flattened upper-buttock outline see the most change. If you are hoping for a dramatically bigger shape, this treatment is not a match, and we will tell you so at the consultation.

At CoLaz, the Brazilian bum lift starts from £300 per session and is available at our Reading clinic. The typical protocol is a course of six sessions, one week apart, and results typically last 6 to 12 months with maintenance sessions. The full plan is confirmed in writing at your free consultation, not on day one at the till.

Can fat freezing help with bum and hip shape?

Fat freezing can refine the areas around the buttocks, such as the flanks or outer thighs, but it does not lift, firm or enlarge the buttocks themselves.

Fat freeze (cryolipolysis) uses controlled cold to crystallise fat cells in a small, stubborn pocket, which your body then clears over 8 to 12 weeks. At CoLaz it starts from £159 for a single area, and most areas need 2 to 3 sessions, 6 to 8 weeks apart. It suits people already within a healthy weight range who have a defined pocket, and it is not a weight-loss treatment.

Because it removes volume rather than adding it, fat freezing can change proportions. Treating the flanks can make the waist-to-hip curve look more defined. That is different from lifting the bum itself.

It also carries a rare risk worth knowing about. A 2025 meta-analysis of paradoxical adipose hyperplasia (a delayed overgrowth of fat cells in the treated area) concluded that its incidence appears higher than manufacturers report, and called for clear risk disclosure. It is worth raising at any fat freeze consultation.

Which option suits which goal?

Here is how the main options compare, in plain terms.

Goal	Option	What to know
A noticeably bigger, fuller shape	Surgical BBL or implants, with a properly qualified UK surgeon	Major surgery with real risks, no shortcuts, and no non-surgical equivalent
Firmer, smoother skin and softer cellulite	Device-based bum lift	Gradual, modest change over a course, with maintenance
Refining flanks or outer thighs	Fat freezing	Reduces a pocket, does not lift the bum, rare risk of paradoxical adipose hyperplasia
A bigger bum from filler	Not recommended	Classed as surgical, linked to serious harm, proposed for doctor-only rules

The honest answer is that no non-surgical treatment gives the volume a surgical BBL can. If volume is the goal, the safest route is a conversation with a UK surgeon registered with the GMC, working in a regulated facility. We would rather send you there than sell you something that cannot deliver.

How can you check a practitioner before any body treatment?

Check three things before you book anything: who is doing it, where, and what happens if something goes wrong.

The same checklist applies at home and abroad:

• Ask for the practitioner’s qualifications and insurance, and verify them on a register such as Save Face or the JCCP.
• Ask whether the clinic is registered with the Care Quality Commission if you are considering any surgical procedure or body filler.
• Ask exactly what will be injected or applied, and to see the product packaging.
• Be wary of a very low price, a rushed decision, or a treatment offered in a home, hotel room or pop-up venue.
• Ask who you contact, and who pays, if there is a complication.

Any reputable practitioner will welcome these questions. If a clinic does not, that tells you what you need to know.

How to start at CoLaz

Every plan at CoLaz starts with a free consultation at one of our seven UK clinics. We take your medical history and goals, talk through realistic expectations, and write down the recommended plan, including sessions, spacing and price per session, before anything is booked.

If a device-based treatment fits what you want, we will say so. If it does not, or if what you really want is more volume than a non-surgical treatment can offer, we will say that too. The quickest way to book is by WhatsApp to your nearest clinic.