Polynucleotides vs Dermal Fillers — Which One Is Right for You in 2026?

Something significant happened in early 2024 that the aesthetics industry is still talking about. For the first time in the history of UK Google search data, searches for polynucleotides overtook searches for dermal fillers. Not a gradual creep. An overtake. In a market where dermal fillers have been the dominant injectable for over two decades, that is a seismic shift — and it tells you something important about where aesthetic medicine is heading and why.

At Sebastian Rose Medical Aesthetics Cardiff, we offer both treatments. We use both treatments. We combine both treatments regularly. And in this post we are going to give you the most honest, clinically accurate comparison of polynucleotides and dermal fillers that you will find anywhere — because the decision between them is not about which one is better. It is about which one is right for your skin, your face and what you actually want to achieve.

They are not the same thing. They do not do the same thing. And understanding the difference will change how you think about aesthetic treatment entirely.

WHAT ARE DERMAL FILLERS?

Dermal fillers are injectable gels — most commonly made from hyaluronic acid, a sugar protein found naturally in the skin. When injected, each molecule of hyaluronic acid attracts up to 1,000 times its own weight in water, providing immediate volume, hydration and structural support to the area treated.

Fillers are a structural tool. They physically occupy space beneath the skin. They lift, they contour, they define, they restore. They are immediate — you walk out of the clinic with a visible result. And in the hands of a skilled, medically qualified injector, they can be extraordinarily natural and precise.

They are also temporary. Most hyaluronic acid fillers last between 9 and 18 months depending on the product, the area treated and the individual patient's metabolism. They can be dissolved with hyaluronidase if needed — which is one of the reasons we use hyaluronic acid fillers at Sebastian Rose.

What fillers are best for: Loss of facial volume. Cheek definition. Lip enhancement. Tear trough hollowing. Nasolabial folds. Jawline definition. Temple hollowing. Chin projection. Any area where you want structural lift, shape or volume — immediately.

What fillers cannot do: Fillers cannot improve the quality of your skin. They cannot make your skin more hydrated, more elastic, more resilient or more youthful at a cellular level. They sit beneath the skin and support it from underneath. The skin itself remains unchanged.

WHAT ARE POLYNUCLEOTIDES?

Polynucleotides — also known as PDRN or PN — are injectable treatments derived from purified DNA fragments, most commonly extracted from salmon or trout. The DNA sequences used are remarkably similar to human DNA, which is why they are so well tolerated and so biologically active in human tissue.

When injected into the skin, polynucleotides do not add volume. They do not fill a space. Instead, they communicate directly with your fibroblast cells — the cells responsible for producing collagen, elastin and hyaluronic acid — and instruct them to activate, regenerate and repair. This is what makes polynucleotides genuinely different from every other injectable on the market. They are not putting anything into your skin. They are making your skin produce more of its own essential proteins.

The results are not immediate in the same way fillers are. Polynucleotides work progressively — with most patients noticing significant improvement in skin quality, hydration, firmness and texture from around three to four weeks after their first session, building further across a course of treatment. What you get is not a filled appearance. It is genuinely healthier skin.

What polynucleotides are best for: Under-eye crepiness, dark circles and fine lines. Skin quality decline across the face. Loss of skin elasticity and firmness. Fine lines and surface wrinkles. Dehydrated or dull skin. Areas where adding volume with filler is either inappropriate or insufficient — particularly the under-eye area, where traditional tear trough fillers carry a 15–20% risk of chronic fluid retention and a visible bluish tint known as the Tyndall effect. Polynucleotides treat the same area with none of those risks.

What polynucleotides cannot do: Replace lost structural volume. If you have significant loss of volume in your cheeks, temples or jawline, polynucleotides alone will not restore that. They will improve the quality of the skin in those areas — but they will not lift and restore structure in the way a filler or biostimulator like Sculptra can.

THE KEY DIFFERENCES — SIDE BY SIDE

If you remember nothing else from this article, remember this:

Fillers change the shape and structure of your face. Polynucleotides change the quality and health of your skin.

One is a structural tool. The other is a regenerative tool. They address different aspects of ageing — and in most patients who are experiencing both volume loss and skin quality decline, the most effective approach uses both.

	Polynucleotides	Dermal Fillers
What it does	Regenerates skin at cellular level	Restores volume and structure
Results	Gradual — 3–6 weeks	Immediate
Duration	6–12 months	9–18 months
Reversal	Not reversible	Fully reversible
Volume	Does not add volume	Adds volume
Best for	Skin quality, under-eye, fine lines	Volume loss, contour, structure
Risk of migration	None	Low but possible
Suitable for under-eye	Yes — preferred option	Requires careful assessment
Downtime	Minimal	Minimal

SO WHICH ONE DO YOU NEED?

This is the question we get asked constantly — and the honest answer is that for most patients, the question is not which one instead of the other. It is which one first, and whether both are needed.

You probably need polynucleotides if: Your skin looks dull, tired or dehydrated even when you are not. Your under-eye area is crepey, lined or shadowed. You have noticed that your skin lacks the bounce and resilience it had a few years ago. You want to improve the quality and health of your skin rather than change its shape. You are in your late 20s or 30s and want to preserve what you have before significant loss begins — this is what we call prejuvenation, and polynucleotides are one of the most effective prejuvenation tools in aesthetic medicine.

You probably need dermal fillers if: You have noticeable loss of volume in your cheeks, temples or jawline. Your nasolabial folds have deepened. Your lips have thinned. You have hollow-looking tear troughs that have lost volume rather than just quality. You want a structural improvement that is visible immediately.

You probably need both if: You are in your late 30s, 40s or 50s and experiencing both skin quality decline and volume loss simultaneously. This is the most common presentation in our clinic — and it is exactly why we rarely recommend treating just one aspect of ageing in isolation. Volume loss and skin quality decline are different problems that require different solutions.

A protocol that many of our patients follow is to begin with polynucleotides to improve skin quality and create a healthier foundation, then introduce dermal fillers or biostimulators into skin that is better hydrated, more elastic and more receptive. There is growing clinical evidence that polynucleotides may even enhance the longevity and integration of dermal fillers placed after them — because the tissue they sit in is healthier and more supportive.

WHAT ABOUT THE TREND AWAY FROM FILLERS?

It would be dishonest to write this article without addressing what is happening in the industry right now.

The shift in search data is real. The move away from heavy filler use is real. And the reasons for it are worth understanding.

The overfilled look that characterised the mid-2010s — the pillow face, the overstuffed cheeks, the shelf-like upper lips — was a product of an industry that over-relied on fillers and under-invested in skin quality. (And, in our not-so humble opinion, a direct consequence of unethical, untrained, unregulated 'providers' - but thats a different post).

Oftentimes, it was less 'obvious' than it was a sort-of-tingly-feeling-in-your-brain when looking at someone, that something wasn't quite right with their face (see image attached).

Thankfully, as patients became more informed and as aesthetic medicine became more clinically sophisticated, the conversation shifted. Patients stopped asking to look different and started asking to look better. Healthier. More like themselves — but more rested, more radiant, more vibrant.

Polynucleotides answer that brief in a way that fillers alone never could.

But — and this is important — the shift is not away from fillers entirely. It is toward a more balanced, more intelligent use of all available tools. Dermal fillers remain one of the most effective structural interventions in non-surgical aesthetics. They are not going anywhere. What is changing is how and when they are used — and what they are used alongside.

The best results in 2026 come not from choosing between polynucleotides and fillers, but from understanding exactly what each one does and using them accordingly.

A WORD ON WHERE YOU HAVE THIS DONE

Both polynucleotides and dermal fillers are injectable treatments that carry real clinical risks when placed incorrectly or administered by practitioners without the appropriate anatomical knowledge and emergency training. The most serious complication of dermal filler — vascular occlusion, where filler enters or compresses a blood vessel — can result in tissue death or blindness if not recognised and treated immediately.

At Sebastian Rose Medical Aesthetics Cardiff, every injectable treatment is performed by NMC and GMC-registered medical professionals. We carry hyaluronidase on site at all times. We have full emergency protocols in place. We will never pressure you into treatment you do not need, and we will always give you an honest assessment of which treatment — or combination of treatments — is genuinely appropriate for your skin and your goals.

READY TO FIND OUT WHICH ONE IS RIGHT FOR YOU?

We offer polynucleotides, dermal fillers, and the full range of advanced injectable treatments at our Cardiff clinic. Every treatment begins with an honest, thorough consultation — no pressure, no upselling, no one-size-fits-all protocols.

Book a consultation at Sebastian Rose Medical Aesthetics, 39 Charles Street, Cardiff, CF10 2GB. Or call us on 0800 772 0137.

Cardiff's highest-rated independent medical aesthetics clinic. 4.9 stars. 513+ reviews. Results that speak for themselves.