Polynucleotides vs Dermal Fillers: What Is the Difference and Which One Do Your Patients Need?

Something significant happened in 2024 that the aesthetics industry is still talking about. Search interest in polynucleotides increased significantly throughout 2024, reflecting growing patient demand for regenerative aesthetic treatments that go beyond traditional volume correction. 

In a market where hyaluronic acid fillers have been the dominant injectable for over two decades, that shift tells you something important about where aesthetic medicine is heading in 2026. 

But here is what a lot of the online noise gets wrong: polynucleotides and dermal fillers are not rivals. They are not competing for the same job. They do fundamentally different things, and understanding that difference is one of the most useful clinical distinctions a practitioner can make. 

In this guide, we break down exactly what each treatment does, how they differ, when to use each one, and how to combine them effectively for the best patient outcomes. Whether you are building your injectable knowledge from scratch or looking to add regenerative treatments to your existing skill set, this is the guide to bookmark. 

Polynucleotides are injectable bio-stimulators derived from purified DNA fragments, most commonly sourced from salmon or trout sperm DNA. They are also referred to as PDRN (polydeoxyribonucleotide) treatments, though there are technical distinctions between the two. PDRN refers to shorter DNA chain fragments, while polynucleotides typically describes longer-chain versions. In clinical practice, the terms are often used interchangeably. 

When injected into the skin, polynucleotides do not add volume. What they do is support the body's own repair and regeneration processes at a cellular level. Current evidence suggests polynucleotides may support fibroblast activity and tissue repair through adenosine receptor-mediated pathways, contributing to collagen synthesis, hydration, and improved skin quality. This makes them a fundamentally different category of injectable to dermal fillers, and explains why PDRN injections and polynucleotide treatments are increasingly described as regenerative injectables rather than simply skin boosters. 

The mechanism of polynucleotides is quite different from anything that had previously existed in aesthetic injectables. Rather than occupying space or adding structure directly, they essentially send a signal to the skin to repair and rebuild itself. 

Key effects of polynucleotide treatment include: 

• Stimulation of collagen and elastin production 
• Improved skin hydration and barrier function 
• Enhanced skin elasticity and firmness 
• Reduction in fine lines and crepiness over time 
• Improvement in skin tone and texture 
• Some degree of anti-inflammatory effect in the treated tissue 

Because results are driven by the body's own biological response, they develop gradually. Most patients begin to see meaningful improvement after two to three sessions, spaced three to four weeks apart, with full results typically visible at around six to eight weeks from the first treatment. 

Results from polynucleotide treatment can last between six and twelve months, though this varies considerably depending on the patient's age, skin quality, lifestyle, and the specific product used. 

Dermal fillers are injectable gels, most commonly made from hyaluronic acid (HA), a molecule that occurs naturally in the skin and has a remarkable ability to attract and hold water. When injected, HA filler physically occupies space beneath the skin surface, restoring lost volume, softening folds, and providing structural support to areas that have flattened or hollowed with age. 

The result is immediate and visible. Volume is restored, contours are lifted, and features that have softened can be reshaped in a single session. 

Hyaluronic acid is the most widely used filler material because it is biocompatible, predictable in its behaviour, and, importantly, reversible. HA fillers can be dissolved using the enzyme hyaluronidase if needed, which is an important safety consideration. 

Other filler materials include calcium hydroxylapatite (CaHA), such as Radiesse, and poly-L-lactic acid (PLLA), such as Sculptra. These are technically classed as biostimulators rather than pure volume fillers, as they also stimulate collagen production. We cover these in more detail in our guide on combination aesthetic treatments. 

HA fillers typically last between six and eighteen months, depending on the product, the area treated, and the individual patient's metabolism. Denser products placed deeper tend to last longer than softer products used closer to the surface. 

For a practical overview of dermal filler products, techniques, and what to expect as a new injector, our beginners guide to Botox and dermal filler covers this in accessible detail. 

This is the most important thing to understand, and it is worth stating clearly. Dermal fillers restore volume. Polynucleotides restore skin quality. They are not alternatives. They are addressing different problems. A patient with significant volume loss needs filler, not polynucleotides. A patient with skin that is dull, crepey, thin, or lacking in resilience needs polynucleotides, not filler. Many patients, particularly those in their 40s and above, have both concerns simultaneously, and that is where the real clinical thinking begins. A useful shorthand: fillers change the shape and structure of the face. Polynucleotides change the health and quality of the skin itself. 

Patients treated with polynucleotides typically describe their skin as looking healthier, more hydrated, and more rested after a course of treatment. The changes are real and clinically meaningful, but they are not dramatic in the way that filler can be. 

What polynucleotides do particularly well is improve the quality of the skin in ways that other treatments cannot replicate. Thin, crepey skin around the eyes, fine lines across the cheeks, dull or dehydrated skin, and a general loss of the glow and resilience that younger skin has, all respond well to injectable skin rejuvenation with polynucleotides. Emerging clinical evidence suggests improvements in skin hydration, elasticity, and dermal quality following a course of treatment, though the evidence base continues to develop and results vary between individuals and products. 

Because results are gradual, setting patient expectations correctly at consultation is important. Patients need to understand that this is a process rather than an immediate transformation. A session-by-session improvement, reviewed at follow-up, tends to build patient confidence and long-term loyalty. 

The defining characteristic of dermal filler results is immediacy. A patient who walks in with sunken cheeks, hollow temples, or deep nasolabial folds can walk out looking significantly different. That immediate, visible improvement is one of the reasons HA filler became so dominant in aesthetics. 

When placed correctly, by a practitioner with strong anatomical knowledge and a considered treatment plan, filler produces natural-looking, harmonious results that restore what ageing has taken away. The skill lies in understanding facial anatomy well enough to add volume where it belongs, in the right tissue plane, with the right product, and in the right amount. 

Our online anatomy course covers the fat pads, vascular structures, and facial regions that underpin safe, effective filler placement in depth. 

Polynucleotides are particularly well suited to areas where the skin is thin, delicate, or prone to crepiness, and where adding filler volume would not be appropriate or sufficient to address the concern. 

Key treatment areas include: 

• Under-eyes (periorbital area): This is one of the most common and well-established uses for polynucleotides. The skin under the eye is among the thinnest on the face, and crepiness, fine lines, and dark circles caused by skin translucency often respond better to polynucleotides than to filler. 
• Cheeks and midface: For patients whose concern is skin quality rather than volume loss. 
• Neck and décolletage: These areas have thin, often neglected skin and respond well to polynucleotide-driven collagen stimulation. 
• Hands: Crepey or thin skin on the dorsum of the hands. 
• Scalp: Polynucleotides are also used for hair loss treatment, where they stimulate follicle health and tissue repair. 
• Upper lip lines: Fine vertical lines around the lips that do not have enough volume behind them to justify filler. 

Dermal fillers are appropriate wherever there is genuine structural volume loss, contouring need, or deep folds that are present at rest. 

The most common treatment areas for HA fillers include: 

• Cheeks and midface: To restore lost volume and lift the mid-face. 
• Temples: Hollow temples are one of the earliest signs of facial ageing and respond well to targeted filler placement. 
• Lips: To restore volume and definition that naturally reduces with age. 
• Nasolabial folds: Where deepening is driven by volume loss above. 
• Jawline and chin: For contouring and definition. 
• Tear troughs: Where hollowing is structural, following careful patient assessment. Many practitioners now favour indirect midface support before treating the tear trough directly, and some patients are better suited to regenerative or skin-quality approaches, such as under eye skin boosters or polynucleotides, rather than filler placed directly in this area. 
• Non-surgical rhinoplasty: Reshaping the nose without surgery using precise filler placement. 

For a detailed look at how filler techniques apply to the lower face specifically, our lower face masterclass series covers this in practitioner-level depth. 

This is where clinical judgement comes in, and it is also one of the most common areas of patient confusion. People arrive having read about polynucleotides online and wondering if they need them instead of filler, or vice versa. Part of the practitioner's job is to guide that conversation accurately. 

Polynucleotides are likely the most appropriate treatment if the patient: 

• Has skin that looks dull, dehydrated, or lacks resilience even at rest 
• Has fine lines and crepiness, particularly under the eyes or around the mouth 
• Wants to improve skin quality and texture rather than change facial shape 
• Is in their late 20s or 30s and wants to invest in their skin before significant volume loss begins (sometimes called prejuvenation) 
• Has previously had fillers but feels the results are not quite right because the underlying skin quality is poor 
• Is recovering from or preparing for other treatments such as laser resurfacing, radiofrequency, or microneedling 

Dermal fillers are likely the most appropriate treatment if the patient: 

• Has visible, structural volume loss in the cheeks, temples, or under-eyes 
• Has deep nasolabial folds that are present even when the face is at rest 
• Has lost definition in the jawline or chin 
• Wants a more immediate, visible result 
• Is looking to reshape or contour a specific feature 
• Is experiencing the facial changes associated with rapid weight loss (as we cover in our blog on Ozempic face and how aesthetic practitioners can treat it) 

For many patients, particularly those over 40, both volume loss and a decline in skin quality are present simultaneously. In these cases, a combined treatment plan is usually the most appropriate approach. 

A general guiding principle is to address skin quality first, particularly if the patient has not had any previous aesthetic treatment. Many practitioners prefer improving baseline skin quality before structural filler treatment, as healthier tissue may support a more natural overall outcome. This approach also gives patients a chance to see and appreciate gradual skin improvements before committing to volume restoration. 

Our how to assess skin before treatment blog covers the consultation framework for identifying where each patient sits in terms of their skin quality and structural concerns. 

Yes. And in many cases, combining them produces results that neither treatment could achieve alone. 

This is one of the defining shifts in aesthetic medicine in 2026. The approach is moving away from single-treatment appointments and towards what is sometimes called treatment stacking, where different modalities are used together to target multiple tissue depths and concerns at once. 

A well-planned combination approach for a patient with both volume loss and reduced skin quality might look something like this: 

1. Session 1 and 2: Polynucleotides to improve skin hydration, elasticity, and collagen density. 
2. Session 3: Review skin quality improvements and introduce HA filler for structural volume restoration. 
3. Ongoing: Polynucleotide maintenance sessions every six to twelve months, with filler top-ups as needed. 

This sequenced approach means the filler is being placed into skin that is in better condition, which generally produces a more natural and longer-lasting result. 

Some products now combine HA and polynucleotides in a single formulation, designed to offer both immediate volume and biological stimulation. Published research suggests these hybrid products may offer advantages in terms of collagen stimulation and durability compared to HA alone, though this is an evolving area of evidence. 

For a broader overview of how to layer and sequence different injectable treatments effectively, our blog on combination aesthetic treatments goes into this in practical detail. 

Both polynucleotides and dermal fillers are injectable treatments and carry clinical risks when administered without the appropriate medical knowledge, anatomical training, and emergency protocols. 

The most serious complication of dermal filler is vascular occlusion, where filler enters or compresses a blood vessel. This can result in tissue necrosis or, in the most severe cases, vision loss. While rare when performed by trained practitioners, this risk means that filler should only ever be administered by qualified medical professionals with the knowledge to recognise and manage complications promptly. 

Other filler complications include bruising, swelling, infection, asymmetry, nodule formation, and delayed inflammatory reactions. Delayed inflammatory reactions and biofilm-related complications, while uncommon, should also be recognised as part of a practitioner's complication awareness. These are largely manageable when practitioners have a solid understanding of the relevant anatomy, tissue planes, and early warning signs. 

Our complications course covers recognition, prevention, and management of injectable complications in full detail. 

Polynucleotides carry a generally lower risk of vascular occlusion compared to volume-replacing fillers, but they are still medical injectables and should be treated as such. Common side effects include temporary redness, swelling, and small injection-site bumps that typically settle within 24 to 48 hours. 

Patients with known fish or seafood allergies should be assessed carefully before polynucleotide treatment, as most products are derived from salmon or trout. Autoimmune conditions and active inflammation at the treatment site are also contraindications to consider. 

As with all aesthetic injectables, the most important safety factor is the knowledge and clinical judgement of the practitioner performing the treatment. Understanding anatomy, patient selection, product behaviour, and complication management is non-negotiable. 

The rise of polynucleotides as a mainstream aesthetic treatment changes the clinical landscape for practitioners entering or growing within the field. 

Knowing how to assess a patient's skin quality, recognise the difference between a skin quality concern and a structural volume concern, and build a treatment plan that addresses both when necessary is now a fundamental skill. Modern aesthetic practice increasingly involves combining structural and regenerative approaches depending on patient needs. The patients presenting in 2026 are more informed, more interested in long-term skin health, and increasingly asking about salmon DNA injections, PDRN injections, and regenerative injectables alongside more familiar treatments. 

That said, dermal fillers are not going anywhere. Structural volume restoration remains one of the most effective tools in non-surgical aesthetics, and a strong foundation in filler technique, anatomy, and safety is still the bedrock of aesthetic practice. 

The practitioners who will build the strongest clinical reputations going forward are those who understand both modalities clearly, know how to combine them thoughtfully, and can explain the difference to patients in a way that builds trust. 

If you are newer to aesthetics and want to understand the clinical foundations before adding polynucleotides to your knowledge base, our clinical essentials course is a good place to start. It covers the core theory across botulinum toxin and dermal fillers that underpins safe injectable practice. 

The future of aesthetics is also increasingly focused on whole-patient health rather than isolated treatments. Understanding how factors like skin ageing, cellular health, and hormone changes affect the face is becoming part of the picture too. Our cellular ageing course explores this evolving area if you want to go deeper. 

At DermaHub, we are the official online learning platform from Derma Medical, built specifically for medical professionals in aesthetics. Our courses are designed to give you the clinical knowledge, anatomical grounding, and practical understanding you need to treat patients safely and effectively.

Our online aesthetics course library covers everything from the foundations of botulinum toxin and dermal filler technique, to facial anatomy, complications management, skin boosters, PDO threads, and advanced treatments. 

For practitioners looking to build their injectable knowledge from the ground up, the clinical essentials course is an ideal starting point. It covers the core theory across Botox and fillers, with a strong focus on patient safety and real-world technique. 

For those wanting to deepen their anatomical knowledge, the anatomy course covers fat pads, vascular structures, and key facial regions in the detail that underpins safe, effective treatment. 

And for practitioners who want to understand how to manage the unexpected, our complications course provides thorough coverage of recognition, prevention, and management of injectable complications. 

All DermaHub content is available on demand, so you can learn around your existing clinical commitments, from your phone, tablet, or computer, at whatever pace suits you. Our CPD-accredited courses also support your continued professional development, and you will receive a certificate on completion. 

Not sure which option is right for you? You can explore our full course library and pricing plans to find the best fit, or start a free trial to get a feel for the platform before committing. 

Here is a quick summary of the most important points from this guide: 

• Polynucleotides and dermal fillers are not the same thing and should not be thought of as alternatives to each other. 
• Polynucleotides work by stimulating the skin's own collagen and repair processes. They improve skin quality, hydration, and texture over time. 
• Dermal fillers restore structural volume immediately. They are most appropriate where there is visible, structural loss of tissue. 
• The best outcomes for many patients come from combining both, using polynucleotides to improve skin quality and fillers to address structural concerns. 
• Both treatments are medical injectables. Both carry clinical risks. Both require trained practitioners with strong anatomical knowledge and complication management skills. 
• The aesthetics industry is shifting towards a more regenerative, skin-health-focused model in 2026, and understanding polynucleotides is becoming a core clinical skill. 

If you are a medical professional looking to build your confidence and knowledge in aesthetic injectables, including dermal fillers, skin boosters, and the emerging world of regenerative treatments, DermaHub has the online courses to support you. 

Explore our full course library, check out our webinars and live injecting sessions, and view our pricing options to find the plan that works for you. 

Start your free trial today and see why thousands of aesthetic practitioners choose DermaHub as their go-to online training platform.