Polynucleotides for Under Eyes: What They Can and Cannot Do

The skin beneath the eyes is the thinnest on the face, and it is usually the first place people notice looking tired. Concealer stops working. A good night's sleep stops making a difference. At that point most people start looking for a treatment, and increasingly the one they find is polynucleotides.

This guide explains what polynucleotides actually do under the eyes, what they will not fix, and how they compare with the alternatives. We treat this area regularly at NassifMD Medical Spa in MediaCityUK, Salford Quays, and the honest answer is that polynucleotides suit some under-eye concerns very well and are the wrong choice for others.

What are polynucleotides?

Polynucleotides are short chains of purified DNA fragments, derived from salmon. They are injected into the skin in very small amounts, where they act as a signal rather than a filler: they encourage fibroblasts, the cells responsible for producing collagen and elastin, to become more active.

The important distinction is that polynucleotides add almost no volume. They are not designed to fill a hollow. What they do is improve the quality of the skin itself — its thickness, hydration and resilience — over a period of weeks.

Is this the “salmon sperm facial”?

Yes, that is the same treatment, and the nickname has done it no favours. Polynucleotides used in aesthetics are extracted from salmon DNA and then highly purified, which is why the marketing shorthand stuck after Kim Kardashian and Jennifer Aniston were reported to have had it.

It is worth separating the celebrity framing from the treatment. Polynucleotides have been used in regenerative medicine for wound healing long before they reached aesthetics. The under-eye application is newer, but the underlying material is not a novelty.

Why the under-eye area shows age first

Several things happen at once in this area:

• The skin here is a fraction of the thickness of the cheek, so it loses collagen visibly sooner
• Fat pads that once sat smoothly under the eye begin to descend and separate, creating a hollow
• Blood vessels sitting close to the surface show through thinning skin as a bluish shadow
• Pigment can accumulate, particularly in deeper skin tones, creating a brown rather than blue shadow
• Repeated movement from squinting and smiling creates fine lines earlier than elsewhere

This matters because “dark circles” is not one problem. It is at least four, and they respond to completely different treatments.

What polynucleotides can improve under the eyes

Polynucleotides work best where the issue is skin quality rather than lost volume. Realistically, that means:

• Crepey, finely lined skin beneath the eye
• Thin skin through which vessels are visible, where thickening the skin softens the shadow
• Dryness and dullness in the eye area
• Early laxity, before there is significant hollowing
• Skin quality around an area previously treated with filler

Because the effect is gradual, results tend to look like the area has simply recovered rather than been treated. For many patients that is precisely the appeal.

What polynucleotides will not fix

We would rather set this out plainly than have you disappointed.

A true hollow. If the shadow under your eye is caused by volume loss, adding skin quality will not fill it. That is a job for tear trough filler, or sometimes for treating the cheek to restore support beneath the eye.

Puffiness and eye bags. Protruding fat pads are a structural issue. Polynucleotides do not reduce them, and no injectable reliably does.

Deep pigmentation. Where the darkness is genuine pigment rather than shadow, a pigmentation treatment plan is the more logical route.

Significant skin laxity. Once there is real loose skin, treatments that improve quality can soften the appearance but will not tighten it meaningfully.

An assessment in person is the only way to tell which of these you have, and it is common to have more than one at the same time.

Polynucleotides vs tear trough filler

These are often presented as competitors. They are not really comparable, because they solve different problems.

Tear trough filler adds volume into a hollow. It works immediately and can be dramatic where there is genuine volume loss. It is also a technically demanding treatment in a forgiving-of-nothing area, and in the wrong candidate — particularly someone with thin skin, poor lymphatic drainage or existing puffiness — it can create swelling that persists.

Polynucleotides add no volume and work gradually. They carry less risk in the thin-skinned patient precisely because they are not trying to fill anything.

In practice, the two are often sequenced: improve the skin first, then assess whether any volume is still needed. Frequently less filler is required than expected, and sometimes none.

Polynucleotides vs Profhilo and other skin boosters

Profhilo is a hyaluronic acid bio-remodelling treatment. It hydrates and stimulates collagen and elastin across a broader area, and it is typically used on the face, neck, décolletage and hands rather than placed delicately beneath the eye.

Polynucleotides work through a different mechanism — supporting cellular repair and calming inflammation — which is part of why they suit the delicate under-eye area.

Redensity 1 is a third option again, combining hyaluronic acid with amino acids, antioxidants and vitamins to improve surface radiance.

These are not mutually exclusive. A plan might use polynucleotides under the eyes and Profhilo across the lower face and neck.

What happens during the appointment

Treatment begins with an assessment of which of the under-eye concerns above actually applies to you. If polynucleotides are appropriate, the area is cleansed and numbing cream applied.

The product is placed through a series of very small injections beneath the eye. The appointment takes around 30 minutes including preparation, and most of that is waiting for the numbing cream to work.

How many sessions will I need?

Polynucleotides are a course, not a single treatment. We generally recommend three sessions spaced two to four weeks apart, because the effect is cumulative — each session builds on the fibroblast activity stimulated by the last.

Initial changes in hydration and texture are often noticed from around three weeks. The fuller effect develops over the following weeks as new collagen forms. Results typically last six to nine months, after which a maintenance session keeps them topped up.

If you are being told a single session will transform the area, be sceptical.

Side effects and downtime

Downtime is minimal but not zero. Expect small raised bumps at each injection point, which settle within a few hours. Mild redness and swelling are common on the day.

Bruising is the main consideration under the eyes, because the skin is thin and vascular. It is not universal, but it is common enough that we would not recommend booking this in the week of a wedding or an important event. Where bruising occurs it usually resolves within a week and is easily covered.

Who is not suitable?

Polynucleotides are not appropriate during pregnancy or breastfeeding, if you have an active infection or inflammatory skin condition in the area, or if you have a known allergy to fish. Certain medical conditions and medications also need discussion first.

Suitability is confirmed at consultation after reviewing your medical history. This is not a treatment we will proceed with on the same day as an enquiry without that assessment.

Polynucleotide under-eye treatment in Manchester

NassifMD Medical Spa is at The Alexandra, 200–220 The Quays, MediaCityUK, Salford, M50 3SP. We have on-site private parking, and MediaCityUK has its own Metrolink stop, so we are a short tram ride from Manchester city centre and straightforward to reach from Salford, Trafford and Cheshire.

The under-eye area is unforgiving and the right treatment depends entirely on which underlying problem you have. If you are unsure whether you are dealing with hollowing, thinning, pigment or puffiness, that is exactly what a consultation is for.

Book a consultation, see our treatment prices, or get in touch with a question first.

This article is general information, not individual medical advice. Every treatment at NassifMD is assessed and planned in person.