Under-eye polynucleotides are designed to improve the quality of delicate skin rather than fill a hollow or remove an eye bag. That distinction matters. A tired-looking under-eye can come from thin skin, fine lines, pigmentation, visible vessels, fluid, fat pads or a structural shadow. One treatment cannot correct every cause.
This guide explains what polynucleotides are, who may benefit, what the evidence currently shows and what to expect from treatment at Dr Motox.
What are under-eye polynucleotides?
Polynucleotides are purified chains made from DNA fragments, commonly sourced from salmon or trout. They are injected in small amounts into the skin. They are not the same as dermal filler and are not intended to create projection or replace lost volume.
How do they support the skin?
Think of the skin as a mattress. Collagen and elastin form part of its supportive structure, while water helps it look smoother and more flexible. Polynucleotides are used to encourage repair signalling within the skin, including activity from fibroblasts, the cells involved in making collagen and other supporting components. The aim is gradual improvement in texture, elasticity and fine lines, not an instant change in facial shape.
The exact formulation varies between products. Some preparations contain additional ingredients, so the product, source and expected result should be discussed during a polynucleotide consultation at Dr Motox.
What can under-eye polynucleotides improve?
They may be suitable when the main concern is thin, crepey or dehydrated-looking skin, early fine lines or reduced elasticity around the eyes. Some people also notice that the area looks fresher as texture improves. Results vary and develop gradually.
They are less likely to solve pronounced tear-trough hollowness, prominent eye bags or pigmentation on their own. Brown discolouration may be driven by melanin, while blue or purple tones may reflect visible vessels through thin skin. A shadow caused by facial structure behaves differently again. Our dark under-eye circles guide explains why diagnosis comes before treatment.
Polynucleotides versus tear-trough filler
Polynucleotides aim to improve the skin itself. Tear-trough filler adds volume to selected hollows. Filler may be inappropriate when puffiness, fluid retention or prominent fat pads are present, while polynucleotides cannot replace missing volume. Some people need neither. Careful assessment of the eyes, cheeks and midface is more useful than choosing a treatment from a trend.
What does the evidence show?
The evidence is promising, but it is still developing. Small controlled studies around the eyes have reported improvements in elasticity, hydration, texture and fine lines. However, products, injection methods and outcome measures differ between studies.
A 2025 systematic review found nine studies involving 219 patients. It concluded that polynucleotide injections showed promising results, but the overall evidence was low to moderate quality and treatment protocols varied. A separate review of current aesthetic research described positive periocular trials while also stressing the need for larger, better-standardised studies.
In plain English, there is a reasonable scientific basis and encouraging clinical data, but no responsible practitioner should promise that every dark circle or line will disappear.
Treatment schedule, results and downtime
At Dr Motox, a typical plan is two sessions around four to six weeks apart, followed by review. The exact number and spacing depend on the product, skin condition and response. Maintenance may be considered every three to six months, but more treatment is not automatically better.
The appointment usually takes about 20 minutes. Small deposits are placed with a fine needle. Raised bumps, redness, tenderness and swelling can be visible afterwards, particularly because under-eye skin is thin. Bruising is also possible. Bumps often settle within hours to a few days, while bruising can last longer. Allow social downtime rather than assuming the area will look untouched immediately.
Aftercare and daily skin support
For the first 24 hours, keep the area clean and avoid rubbing, strenuous exercise, alcohol, saunas, steam rooms and intense heat. Delay make-up until the injection points have closed. Use a gentle cleanser and apply broad-spectrum sunscreen every morning, such as Medik8 Advanced Day Ultimate Protect SPF 50+. Our guide to daily SPF explains why UVA protection matters throughout the year.
Once the tiny injection points have closed, usually by the following day, the Dr Motox Exosome Collagen Face & Neck Sheet Mask is a staple hydration step for the whole face and neck. It is suitable for dry, oily and sensitive skin and can be used regularly when the skin feels dehydrated or needs barrier support. Patch test first, and do not apply it to broken, infected or actively inflamed skin.
Who should postpone or avoid treatment?
Treatment is not appropriate over active infection, inflamed skin or an eye infection. It is normally postponed during pregnancy and breastfeeding because cosmetic treatment data are limited. Tell your clinician about fish allergy, previous reactions to injectables, autoimmune or bleeding conditions, immune suppression, recent eye surgery and all medicines or supplements. Do not stop prescribed blood thinners without speaking to the clinician who prescribed them.
Choose a practitioner with appropriate training, experience and insurance. The NHS advises having a consultation and asking about qualifications, complications and aftercare before a cosmetic procedure.
Increasing pain, marked heat, spreading redness, pale or mottled skin, pus, fever or any visual disturbance needs urgent clinical assessment.
Frequently asked questions
Do polynucleotides remove dark circles?
They may improve skin quality when thin or crepey skin contributes to darkness, but they do not reliably remove pigment, structural shadow, bags or puffiness.
How quickly will I see a result?
Temporary hydration and swelling are not the final result. Texture changes usually appear gradually over the weeks after treatment as the skin responds.
Are under-eye polynucleotides filler?
No. They are injectable skin-quality treatments and are not intended to add structural volume in the way a hyaluronic-acid filler does.
How many sessions will I need?
Dr Motox commonly recommends two sessions four to six weeks apart, followed by review. Your plan may differ after examination.
The best starting point is a cause-led consultation. Explore polynucleotide treatment at Dr Motox or compare it with other options in our guide to Profhilo versus polynucleotides.
