Polynucleotides: the quiet repair treatment behind the "well-rested" look

Polynucleotides are one of the few treatments where the honest description is also the most appealing one: they do not add volume, freeze movement, or change the shape of anything. They improve the condition of the skin they are placed into. For the under-eye area in particular, that distinction is the whole point.

This guide covers what polynucleotides actually are, what the treatment feels like, how many sessions a realistic course takes, and who tends to be disappointed by them — because that last group matters just as much.

What polynucleotides actually are

Polynucleotides are purified chains of DNA fragments, most commonly derived from salmon or trout milt and put through extensive purification. What arrives in the syringe is a sterile gel of short nucleotide chains — no cells, no genetic material that interacts with yours.

Once placed in the skin, they behave as a biostimulator. Rather than occupying space the way a hyaluronic acid filler does, they encourage the fibroblasts already in your skin to behave more like younger ones: producing collagen, improving hydration at the tissue level, and calming low-grade inflammation. The visible change follows the biological one, which is why it arrives gradually.

Why the under-eye area is the headline use

Under-eye skin is the thinnest on the face, has very little supporting fat, and sits directly over a bony orbital rim. It is also the area where conventional filler is least forgiving — placed even slightly wrong, it can hold water, look puffy, or cast a bluish tint.

Polynucleotides sidestep most of that risk profile. They are placed superficially, they are not designed to hold volume, and they do not carry the same tendency to attract water. For crepey texture, fine crinkling, dullness and that permanently-tired look that has nothing to do with how much you slept, they are frequently the more appropriate first step.

What a session is actually like

1. Consultation and mapping. Your practitioner looks at the area in good light and in movement, and agrees the injection points with you. This is also where the honest conversation happens about whether this is the right treatment at all.
2. Numbing. A topical anaesthetic is applied and left to work. For the under-eye area this makes a genuine difference.
3. Placement. A series of small injections along the treatment area, usually with a very fine needle. The under-eyes take roughly ten to fifteen minutes of actual injecting.
4. Immediately after. Small raised blebs where the product sits — these settle within a few hours. Some pinpoint redness. Bruising is possible in this area and worth planning around.

We allow 60 minutes for the eye treatment and 90 minutes for the full face, which includes the numbing time and an unhurried consultation rather than a rushed in-and-out.

How many sessions, and when you see something

Polynucleotides are a course treatment, not a single event. The standard protocol is three sessions, two to three weeks apart. Most people notice hydration and a softer light on the skin after the first session; the structural improvement — the part that changes texture — builds over the weeks following the third.

Full effect is usually judged at around three months from the first session. Maintenance is typically a single session every six to nine months, though this varies enormously with age, skin condition, sun exposure and whether you smoke.

What it costs

The course price is how the treatment is designed to be taken, and it is priced accordingly — a course of three eye sessions works out at about £133 each rather than £150. Single sessions are available, but a single polynucleotide session is best understood as the first third of a treatment rather than a treatment in itself.

Who this is not for

• Anyone with a genuine fish or seafood allergy — the source material makes this an absolute contraindication.
• Anyone pregnant or breastfeeding.
• Active infection, acne or inflammatory skin conditions in the treatment area — this needs to settle first.
• Anyone whose real concern is volume loss or a structural tear-trough hollow. Improving skin quality over a hollow does not fill the hollow.
• Anyone hoping for an immediate change before an event this week. This treatment rewards patience.

Aftercare that actually matters

• Leave the area alone for the rest of the day — no rubbing, no makeup over the injection points.
• No saunas, steam rooms, hot yoga or strenuous exercise for 24 hours.
• Sleep slightly elevated on the first night if you are prone to puffiness.
• Daily SPF, genuinely applied. You have just asked your skin to rebuild; UV is the thing that undoes it fastest.
• Avoid other injectables in the same area for two weeks unless your practitioner has planned them together.

The honest summary

Polynucleotides are one of the more evidence-led additions to aesthetic medicine in recent years, and they suit the way we prefer to work: gradual, reversible in the sense that nothing has been added permanently, and impossible to overdo into something that looks obvious. They are also slow, require a course, and will not fix a structural problem.

If the phrase that keeps coming up when you look in the mirror is "tired" rather than "hollow", this is the conversation worth having.