Polynucleotides vs skin boosters: which is right for you?

Polynucleotides and skin boosters are often mentioned in the same breath, and sometimes sold as though they were the same treatment. They are not. They are made from different materials, they act on the skin by different mechanisms, and they suit different problems. If you are choosing between them, the useful question is not which is better. It is which one matches what your skin is actually short of.

What polynucleotides are, and how they work

Polynucleotides are fragments of purified DNA, most commonly sourced from salmon or trout. Injected into the dermis, they act along two routes. They bind to adenosine A2A receptors on skin cells, which quietens inflammatory signalling and prompts the release of anti-inflammatory mediators. They also feed the salvage pathway, supplying ready made nucleotide building blocks that cells can reuse for DNA synthesis at a point when they are under stress and struggling to make their own.

The effect that matters clinically is on fibroblasts, the cells that build collagen and elastin. Polynucleotides encourage those cells to multiply and to lay down more matrix, and they support small vessel formation and repair of the skin barrier.

So polynucleotides are a conditioning and repair treatment. They do not add volume and they will not fill a line, which is the job of dermal fillers. What they set out to change is the quality of the tissue itself. That makes them a reasonable starting point for skin that is thin, crepey, easily irritated, or slow to settle down after anything.

What skin boosters are, and how they work

Skin boosters are injectable hyaluronic acid, placed in small deposits within the skin rather than positioned deep to create shape. They are the treatments we group under skin boosters and bioremodelling. Hyaluronic acid occurs naturally in the dermis and binds water. Stabilised and cross-linked formulations resist breakdown for longer, so the effect outlasts the first few days.

Two things follow. The first is physical and fairly quick: the gel holds water in the dermis, which lifts hydration, surface smoothness and the way the skin reflects light. The second is slower: the gel stretches fibroblasts mechanically, and stretched fibroblasts produce more collagen. Bioremodelling products work on the same principle, with a formulation designed to spread through the tissue plane rather than sit as separate deposits.

So skin boosters are a hydration and skin quality treatment. They suit skin that reads as dull, dehydrated or finely lined, but which is otherwise reasonably robust.

Which one, in practice

If the problem is water and light, so skin that looks tired, flat and finely creped by dehydration, boosters are usually the more direct answer.

If the problem is the substance of the skin, so genuinely thin, fragile or reactive skin, or the under eye area where the tissue is thin rather than simply dry, polynucleotides are usually where we start.

They are not alternatives in every case. A common sequence is a course of polynucleotides to condition the tissue, then boosters to hold hydration once the skin is in better shape. We space them rather than run them together, and we would not begin both on the same day, because if something reacts we want to know which one caused it.

What the evidence actually shows

Both treatments carry more marketing than high quality trial data, and it is worth saying that plainly rather than leaving you to discover it.

For polynucleotides, the laboratory work on mechanism is reasonably consistent, and there is a body of published clinical experience across rejuvenation, scarring, pigmentation and wound healing. But a 2024 systematic review, cited in a 2026 narrative review in the Journal of Cutaneous and Aesthetic Surgery, concluded that the current evidence is inconsistent and that caution is warranted. Protocols are not standardised, formulations vary between manufacturers, and long term safety data is limited.

For skin boosters the picture is comparable. There is an expert panel consensus on non animal stabilised hyaluronic acid as a skin quality treatment, published in 2018, a systematic review of injectable hyaluronic acid for facial skin quality in Clinical, Cosmetic and Investigational Dermatology in 2023, and prospective studies in the Journal of Cosmetic Dermatology in 2024 and 2025. Most are small and short, and several are single arm, meaning every participant was treated and there was no untreated group to compare against. That design cannot fully separate a real effect from expectation.

What this means in the consulting room is simple. We can tell you what each treatment is designed to do and what we typically see. Anyone quoting you a precise percentage improvement is reading from marketing material, not from evidence.

Who these treatments do not suit

We do not treat you with either if you are pregnant or breastfeeding. Neither has been studied in pregnancy, and an elective treatment does not justify an unknown.

Polynucleotides in particular are not suitable if you have a known fish or seafood allergy, given the source material. We take more care, and will sometimes decline, where there is an active autoimmune condition, and we will not inject through skin that is infected, inflamed or actively breaking out.

Skin boosters are not suitable if you have reacted to a hyaluronic acid product before, and we postpone treatment if the area is inflamed or infected.

For both, we do not treat anyone under 18. Tell us about any blood thinning medication and any supplements that affect clotting, because they change bruising risk and sometimes change the plan. Mention a tendency to keloid scarring or to recurrent cold sores at your consultation.

On recovery, expect redness and small raised lumps where the product went in, usually settling within one to three days. Bruising is common enough that neither treatment belongs in the week before an event. Any clinic describing these treatments as having no downtime is overselling them.

How we decide with you

We assess skin thickness, hydration, laxity and inflammation, take a full medical and medication history, and ask what is actually bothering you. Sometimes the honest answer is that neither of these is the right treatment, and that a different route, or nothing at all for the moment, would serve you better.

If you would like that assessment, our consultations are free, last 30 minutes and carry no obligation to book anything. You can book a free consultation online.