Polynucleotides vs Profhilo: How Skin Boosters Really Differ

TL;DR. Polynucleotides and Profhilo are both injectable skin-quality treatments, but they use completely different mechanisms, suit different concerns and are not interchangeable, so choosing between them requires an honest clinical conversation rather than a social media recommendation.

Why skin boosters have become so popular

Over the past few years, the conversation around cosmetic injectables has shifted noticeably. Patients who once came to clinics in London asking exclusively for volume or wrinkle reduction are now arriving with a different priority: they want their skin to look and feel healthier. They want texture, tone, hydration and a certain luminosity that no amount of topical skincare seems to fully deliver on its own. That shift in demand has brought a wave of injectable treatments broadly labelled as "skin boosters" into the mainstream, and two names dominate that conversation: polynucleotides and Profhilo.

Both are administered by injection. Both are marketed as treatments that improve skin quality rather than simply filling or freezing. And both have genuine clinical evidence behind them. But that is roughly where the similarities end. Understanding how they actually differ, what each one can and cannot do, and who is a realistic candidate for each, is essential before committing to either. At Kensington Cosmetic Clinic, we believe patients make better decisions when they have honest, detailed information rather than a curated highlight reel of results.

What Profhilo actually is and how it works

Profhilo is an injectable treatment made almost entirely of hyaluronic acid, the same molecule found naturally in skin, joints and connective tissue. What makes it different from a standard dermal filler is its formulation. Rather than being cross-linked into a gel that holds a shape and adds volume, Profhilo uses a patented thermal bonding process that keeps the hyaluronic acid in a highly fluid, bio-remodelling state. It spreads through the tissue rather than sitting in one place, which is why it is injected at just five specific points on each side of the face using the BAP (Bio Aesthetic Points) technique.

Once injected, Profhilo stimulates four different types of collagen and elastin. It acts as a slow-release hydrator, drawing water into the dermis and improving the skin's structural scaffolding over several weeks. The result, when it works well, is a general improvement in skin laxity, hydration and overall quality. It is not designed to add volume to specific areas, correct deep folds or lift significantly sagging tissue. Patients who come in hoping for a subtle lift often do notice one, but it is modest and primarily the result of improved skin quality rather than structural repositioning.

A standard course is two sessions spaced four weeks apart, followed by maintenance treatments roughly every six months. The injections themselves take around twenty minutes, and there is minimal downtime, though small bumps at injection sites are common for the first day or two and bruising is always possible.

What polynucleotides are and how they work differently

Polynucleotides, often referred to by brand names such as Plinest, Newest or PDRN, are a fundamentally different class of injectable. Rather than being based on hyaluronic acid, they are derived from purified DNA fragments, most commonly extracted from salmon or trout sperm, though some formulations use other sources. This understandably gives some patients pause, and it is worth addressing directly: the DNA is highly purified and processed to remove any proteins that could cause an allergic reaction, and the safety profile in clinical literature is well established. However, patients with fish allergies should discuss this carefully with their doctor before proceeding.

Polynucleotides work primarily through a mechanism called tissue biorevitalisation. The DNA fragments act as building blocks that stimulate fibroblast activity, the cells responsible for producing collagen, elastin and hyaluronic acid. Rather than delivering hydration directly, they essentially instruct the skin to repair and regenerate itself from within. This makes them particularly well suited to skin that has been damaged by sun exposure, environmental stress, acne scarring or the general atrophy that comes with age. There is also meaningful evidence for their use in sensitive or compromised skin, including around the eyes, where other injectables carry more risk.

The regenerative effect of polynucleotides tends to build more gradually than Profhilo. Most patients require three sessions spaced two to four weeks apart before they see the full benefit, and the results continue to develop for several weeks after the final treatment. The improvements in texture, fine lines and overall skin quality can be quite striking in the right candidate, but they are not instant and they are not uniform across all skin types and concerns.

Comparing the two: key clinical differences

The most important distinction is the mechanism. Profhilo delivers hydration and stimulates collagen through the presence of hyaluronic acid in the tissue. Polynucleotides stimulate the skin's own repair processes through cellular signalling. One is essentially feeding the skin; the other is prompting it to feed itself.

In terms of what each treats best, Profhilo tends to perform well for generalised skin laxity and dehydration, particularly in patients in their late thirties to fifties whose skin has lost elasticity but is not severely damaged. It gives a broad, diffuse improvement across the face and is often described by patients as making them look refreshed rather than treated. Polynucleotides tend to perform better where the concern is more specific: sun damage, fine crepey texture, post-acne scarring, or the particularly thin and delicate skin beneath the eyes. They are also increasingly used on the neck, décolletage and hands, areas where Profhilo can also be used but where the regenerative specificity of polynucleotides can offer an advantage.

Side effect profiles are broadly similar. Both carry a risk of bruising, swelling and temporary redness at injection sites. Neither should be administered during pregnancy or breastfeeding. Neither is appropriate for patients with active skin infections, autoimmune conditions affecting the skin, or certain blood-thinning medications without medical review. Polynucleotides carry the additional consideration of the fish-derived origin, and anyone with relevant allergies must disclose this at consultation.

One thing both treatments share is that they are not substitutes for more structural interventions. If significant volume loss, deep folds or meaningful skin laxity is the primary concern, neither skin booster alone will deliver the outcome a patient is hoping for. In those cases, a conversation about treatments such as Endolift or surgical options may be more appropriate.

Can you combine polynucleotides and Profhilo?

This is one of the most common questions we hear at our Kensington clinic, and the honest answer is: sometimes, yes, but not always and not simultaneously. Some practitioners do combine both treatments in a planned programme, using Profhilo for its broad hydrating and laxity-improving effects alongside polynucleotides for more targeted regeneration in specific areas. There is logic to this approach, and some patients do respond very well to a combined protocol.

However, combining treatments increases cost, the number of sessions required and the cumulative stress on the skin. It also makes it harder to assess which treatment is actually driving any improvement, which matters if you are trying to make sensible decisions about maintenance. Our clinical approach at Kensington Cosmetic Clinic is to start with the treatment most closely matched to the primary concern, assess the response properly, and then consider whether adding a second modality is genuinely warranted. Doing everything at once is rarely the most efficient or the most informative approach.

It is also worth noting that skin boosters of any kind work best as part of a broader skin health strategy. Sun protection, appropriate topical actives and, where relevant, complementary treatments such as microneedling or chemical peels all contribute to the overall picture. Injectable treatments are not a shortcut around good skincare habits; they are an adjunct to them.

Who is a good candidate, and who is not

Profhilo tends to suit patients who are noticing a general loss of skin quality, a dullness or slackness that was not there a few years ago, without a specific textural or pigmentation concern driving the dissatisfaction. It works well across a broad age range, though very young patients with good skin quality are unlikely to notice a meaningful difference. Patients with very significant laxity may be disappointed if they expect a lifting effect comparable to a surgical procedure.

Polynucleotides tend to suit patients with more specific concerns: fine crepey lines, sun-damaged or uneven texture, under-eye hollowing and thinning, or post-acne skin quality issues. They are also a sensible option for patients who have had reactions to hyaluronic acid products in the past, since the mechanism is entirely different. As noted, patients with fish allergies must discuss this carefully before proceeding, and in some cases polynucleotides will not be appropriate.

Neither treatment is suitable for patients who are pregnant or breastfeeding, those with active infections or inflammatory skin conditions in the treatment area, or those seeking dramatic structural change. Patients who are primarily concerned with volume loss, deep nasolabial folds or jowling will generally be better served by a different conversation, one that might include dermal fillers, energy-based devices or a surgical consultation. Honest expectation-setting is not a barrier to treatment; it is the foundation of a good outcome.

What to expect from the consultation process

At Kensington Cosmetic Clinic, no injectable treatment is recommended without a thorough consultation. This is not a formality. The consultation is where your skin is assessed properly, your medical history is reviewed, your concerns are heard in full and a realistic treatment plan is discussed. For skin booster treatments specifically, this means looking carefully at skin quality, laxity, texture and hydration under good lighting, asking about previous treatments and their outcomes, and being honest about what either polynucleotides or Profhilo can and cannot achieve for your particular skin.

Our doctor-led approach means that the person assessing you is medically qualified and accountable. In London, as across the UK, the injectable aesthetics market includes a wide range of practitioners with very different levels of training and clinical oversight. The decision about which treatment to recommend, or whether to recommend either, is a clinical one that should be made by someone with the knowledge and experience to make it responsibly. Our lead clinician brings surgical and aesthetic expertise to every assessment, which means the conversation about skin boosters always sits within a broader understanding of skin anatomy and what different interventions can realistically achieve.

Booking your consultation

If you are considering polynucleotides, Profhilo or any other skin booster treatment in London, the most useful first step is a proper consultation rather than a booking based on what worked for someone else. Skin is individual, concerns are individual, and the right treatment plan reflects that individuality rather than a one-size approach.

At our Kensington clinic, consultations are conducted by our doctor and give you the time and space to ask every question you have, including the ones you might feel awkward raising elsewhere. We will tell you honestly if we think a treatment is unlikely to meet your expectations, and we will never recommend something simply because it is popular or because you have seen it on social media.

To arrange your consultation, please book online here. We look forward to having an honest conversation about what is genuinely possible for your skin.