✨ Wake up tired under-eyes with a treatment that repairs skin from the inside out — no filler, no volume, just your own collagen doing the work.
✅ How it works:
Ultra-pure salmon DNA fragments are injected into the delicate under-eye skin, switching on your fibroblasts to build fresh collagen, elastin and natural hydration. It is biostimulation, not filling — your skin thickens and repairs itself over time.
✅ Who it's for:
Anyone with dark circles, crepey texture or fine lines under the eyes
People who want natural, gradual improvement without changing their face shape
Those who have been told they are not suitable for tear trough filler, or who want to avoid it
✅ The benefits:
Skin looks plumper, firmer and more hydrated
Dark circles fade as skin quality improves
No risk of the bluish Tyndall effect or lumps that can come with fillers
Results are entirely your own tissue — no one can tell you have had anything done
Minimal downtime and safe for the thinnest, most sensitive skin
✅ What's included:
A full consultation with Bella to assess your under-eyes and confirm this is the right approach
Numbing cream applied before treatment for comfort
Precise superficial injections of Plenhyage XL Thin using fine needles
Immediate aftercare advice and written guidance to take home
Follow-up support and planning for your next sessions
✅ What to expect:
A course of 3 to 4 sessions, spaced 2 to 4 weeks apart
First visible hydration within days, meaningful improvement from 4 to 6 weeks
Peak results after completing the full course
Results last 6 to 9 months, with maintenance sessions to keep skin looking its best
💡 Because it adds zero volume, this is one of the safest ways to treat the under-eye area — perfect if you are risk-averse or have been hesitant about filler.
Common questions
Is there any downtime?
You'll usually have some redness and small bumps straight after, and a little swelling that peaks around day two and settles within 24 to 48 hours. Most people carry on as normal and just cover any marks with sunglasses or a bit of concealer once the 12-hour makeup window has passed.
Does it hurt?
It's quite manageable — we apply numbing cream first, so most people feel brief stinging or pressure rather than anything sharp. The under-eye area is sensitive, but the treatment is over quickly and the thin fluid formula is gentler than thicker products.
How many sessions will I need?
Most people need a course of 3 to 4 sessions, spaced 2 to 4 weeks apart. If you've got a wedding, holiday or special event coming up, it's worth starting at least 12 to 16 weeks beforehand so everything has time to settle and look its best.
How long do the results last?
You'll usually start noticing a difference within a few days as hydration kicks in, with real skin quality improvement building from 4 to 6 weeks. Peak results come after your full course, and from there it typically lasts 6 to 9 months depending on your skin and lifestyle.
Are there any side effects?
It's normal to have some redness, swelling, small papules and tenderness around the injection sites for a day or two, and occasionally a small bruise. These settle on their own. Very rarely, someone with fish sensitivity might have a reaction, which is why we screen for allergies beforehand.
Before your treatment
No alcohol for 24 hours before your appointment
Avoid retinol or strong active skincare for 3 days beforehand
Come with clean skin, no makeup on the under-eye area
Let us know if you have any fish or salmon allergy
Avoid blood-thinning medications like aspirin or ibuprofen for 48 hours if safe to do so
Aftercare
No makeup for 12 hours after treatment
Avoid alcohol for 24 hours
No gym, saunas or heavy exercise for 24 hours
Skip retinol and strong actives for 5 days
Apply SPF 50 daily for 2 weeks
Do not massage the area — let the product settle naturally
Small bumps and mild swelling are normal and resolve in 24 to 48 hours
Who it isn’t suitable for
Do not book if you are pregnant or breastfeeding
Do not book if you have a known fish or salmon allergy
Do not book if you have an active skin infection or inflammation around the eyes
Do not book if you have an autoimmune disease affecting the skin
Do not book if you have a bleeding disorder or are on anticoagulant medication without discussing with us first
Do not book if you are under 18
How it compares
Compared with BioRePeel 3x
Primary purpose — Plenhyage XL Face and Under Eye rebuilds what you cannot see over 8 - 12 weeks, switching on your fibroblasts to build fresh collagen, elastin and natural hydration; BioRePeel 3x brightens what you can see within a week, using 35% acid on the surface plus LED light for a fast glow across your whole face.
Suitability for under-eye area — Plenhyage XL Face and Under Eye is specifically made for the delicate under-eye area, with a thin fluid formula that is gentler than thicker products; BioRePeel 3x cannot safely treat the delicate under-eye area.
How long results last — Plenhyage XL Face and Under Eye typically lasts 6 to 9 months depending on your skin and lifestyle; BioRePeel 3x needs you to come back every few months.
Pick BioRePeel if you want a fast glow across your whole face and can come back every few months. Pick Plenhyage if your under-eye skin is thin, crepey or shadowed and needs real structural change that lasts 6–9 months.
More Polynucleotides & Skin Boosters treatments
Sculptra — £350, 1 hr. Rebuild lost facial volume from within — a gradual, natural-looking transformation that can last up to two years.