PDRN and exosomes are the two ingredient words of 2026. They do different jobs, which is exactly why one of the boosters in our range now holds both in a single vial.
If you have been reading K beauty coverage or clinic menus this year, you will have seen both words appear again and again, often in the same paragraph. The pairing is being marketed everywhere as a next generation duo, without much explanation of why the two belong together in the first place or what either word actually means. This guide sets out what each active does, why they work as a pair and what to actually look for in a UK product.
What each active actually is
PDRN, short for polydeoxyribonucleotide, is a purified fragment of DNA that signals to fibroblast cells in the dermis. A 2025 review in Biomaterials Research sets out how PDRN activates adenosine A2A receptors to support fibroblast proliferation, collagen synthesis and tissue repair. It sits in the regenerative category of actives. If you want the fuller mechanism, we have a separate guide on what PDRN actually does for your skin.
An exosome is a tiny bubble released by a living cell. Every cell in every living thing, plant or animal, makes them. They are between thirty and one hundred and fifty nanometres across, small enough that a thousand of them lined up would still be finer than a human hair. Their job is communication. A cell packages up a handful of signalling molecules, wraps them in a membrane and sends the bubble out to talk to another cell. In skincare, the interest is in whether those messages can be put to work on the skin. The answer depends heavily on where the exosome came from.
Plant derived versus biological exosomes
This is the part most brand pages skip. There is not one kind of exosome in skincare. There are two. They behave quite differently once they reach the skin. Biological exosomes are harvested from human or animal cells, usually stem cells grown in a lab. They are the ones most trend coverage is actually describing when it talks about regeneration, because they carry human signalling molecules that human skin cells already know how to read. They are also the ones most cosmetics regulators are cautious about, because harvesting exosomes from living tissue raises safety, stability and licensing questions the sector is still working through. Injectable versions used in clinics sit in a very different regulatory category from anything on a shop shelf.
Plant derived exosomes are harvested from plant cells, most often from botanical stem cell cultures grown in bioreactors. They are the ones you will actually find in home use skincare products in the UK, because they carry a much cleaner safety and stability profile and no risk of animal source contamination. They do not carry human signalling molecules, so the wilder regenerative claims made for biological exosomes do not straightforwardly transfer over. What they do carry is a package of antioxidants, flavonoids and small RNAs, plant compounds with a long, well established track record for supporting the skin barrier and calming the visible effects of everyday stress on skin. Our Medisco PDRN EXO Skin Booster uses grape exosomes specifically, listed on the ingredient panel as Vitis Vinifera Fruit Cell Extract.
Why we pair them
The clearest way to think about the pairing is that PDRN and plant exosomes address different timescales in the same skin. PDRN is a slow burn regenerative active that nudges fibroblasts to build new collagen and elastin over weeks and months. Plant exosomes work faster and on a different layer. They deliver antioxidant support at the barrier and help the skin hold water. Neither one is doing the other one's job. Put both in the same vial and you get regeneration in the deeper skin plus radiance at the surface from the same routine.
There is a practical point too. Microneedling with a regenerative booster leaves skin looking a little tired for a few days after each session while the collagen work happens quietly underneath. The antioxidant and barrier support side of a plant exosome softens that recovery window and helps the skin look fresher sooner. Neither active makes the other work harder in any clinical sense. They just make the overall booster read more usefully in the mirror across the four to six week cycle.
One vial or two separate boosters
You can absolutely run PDRN and exosomes as two separate boosters. The Stayve Salmon DNA Gold vial and a standalone plant exosome serum used across two different microneedling sessions would achieve broadly the same result over time. The reason a combined formulation exists is convenience, cost per session and consistency. One vial applied during a single session gives you both actives at the same moment, without asking you to remember which booster is for which week. Our Medisco PDRN EXO Skin Booster combines PDRN at 5,000 parts per million with the grape exosomes above, alongside gentle AHA and PHA exfoliation and a dual weight hyaluronic acid complex. If you would rather build the routine yourself, the wider Korean skin boosters range covers Salmon DNA, peptide, hyaluronic acid and stem cell options.
What the pairing does not do
Both actives are large molecules by skincare standards, well above the thirty to one hundred and fifty nanometre range that can slip through healthy intact skin unassisted. Applied to intact skin as a surface serum they will behave like a well made antioxidant and hydration booster rather than a regenerative one. This is the whole reason we keep coming back to microneedling. A shallow pass with a Dr. Pen microneedling device or a derma roller creates the tiny channels the actives need to reach the working layers of the skin. We have set out the underlying science on why molecule size matters for absorption. It applies here too.
How to actually use it
The routine is short. Cleanse, sterilise the skin with a hypochlorous acid spray, then set your Dr. Pen to 0.25mm if you plan to apply the booster during the session or use 0.5mm and apply the booster straight after. Stamp rather than glide if you are new to microneedling. Around the eyes always stamp. Apply the booster while the skin is receptive, then keep the rest of your evening simple. No acids, no retinol, no fragrance, no makeup. Use a broad spectrum SPF the next morning because freshly needled skin is more sensitive to UV. Leave four to six weeks between sessions so the skin builds and recovers rather than staying inflamed. The vial fits into a monthly ritual, not a weekly one.
Who it suits
A combined PDRN and exosome booster suits skin that is looking a little dull, tired or in need of renewal, where the concern is a mix of texture and radiance rather than pure hydration. This is also the vial to reach for if you are already running microneedling as a monthly ritual and want an additional lever without adding a second booster session. Anyone with a fish, nut or seed allergy should avoid it, since PDRN is salmon derived. Patch test any new booster first if you have plant sensitivities. Keep it off eczema, dermatitis, psoriasis, active breakouts or any broken skin. Speak to your GP or midwife first if you are pregnant, breastfeeding or managing a medical skin condition.
What to expect from a course
A single session will look fresher and more even in the days after the redness settles, which is the exosome and hyaluronic side of the vial doing its job. The regenerative side of the pairing is slower. Most people notice firmer, more resilient looking skin over three to six months of monthly sessions rather than in a fortnight. Neither active promises to erase fine lines or restore lost volume. Neither replaces professional treatment where that is what someone actually needs. What the pairing does is bring two categories of active into a single at home routine that keeps the skin working rather than waiting.
Common questions
What are exosomes made of?
A membrane of lipids on the outside, containing a small cargo of proteins, RNAs and other signalling molecules inside. The precise cargo depends on the cell that made the exosome, which is why plant exosomes and human exosomes are chemically quite different.
Are plant exosomes as effective as biological exosomes?
Plant exosomes are not trying to be biological exosomes. That is exactly the point. They carry their own well studied package of antioxidants and small RNAs that support the skin barrier and hydration, backed by a growing body of peer reviewed research. They also come with a safety and stability profile that means you can actually buy and use them at home today. Biological exosomes carry human signalling molecules that get more attention in the press, but they sit in a regulatory grey area that keeps them off UK shelves for now.
Is Medisco PDRN EXO the same as an exosome injectable?
No. Injectable skin boosters are a medical procedure carried out by a clinician. Medisco PDRN EXO is a topical vial designed to be paired with microneedling, where the microchannels give the actives a route through the outer skin layer. It is for external use only and should never be injected.
Can I use Medisco PDRN EXO without microneedling?
You can smooth it on as a normal serum but you will be asking less of it. Both PDRN and exosomes are large molecules and need microneedling to reach the working layers of the skin. Used topically on intact skin, the booster still gives you antioxidant, hydration and mild exfoliation from the AHA and PHA content, but the regenerative side of the pairing will not be doing much.
Should I use PDRN EXO if I already use a Salmon DNA or peptide booster?
Salmon DNA Gold is PDRN on its own, so if you already use it you are already getting the regenerative side of PDRN EXO. What PDRN EXO adds on top is the grape exosome layer for barrier support and radiance, plus the AHA, PHA and hyaluronic acid in the same vial. If you want both benefits from one session, switch to PDRN EXO rather than running two vials. Peptide is a genuinely different active, working on firmness and tone rather than PDRN's fibroblast pathway, so pairing or rotating with a peptide booster still makes sense for that separate concern.
How soon will I see a difference?
The exosome and hyaluronic side of the vial shows up first, usually a fresher looking finish within a week of the first session once the redness settles. The PDRN side is a three to six month proposition rather than a fortnight one. Most people who commit to a monthly rhythm see the clearest change in firmness and texture across three to six sessions.
Can I use it during pregnancy or breastfeeding?
We suggest waiting. There is no evidence of harm from plant exosomes topically, but the wider category is new enough that clinical data in pregnancy is limited. PDRN itself has not been established as safe in pregnancy either. If in doubt, ask your GP or midwife before starting.
Ready to try it
If a paired PDRN and exosome booster is where you want to start, our Medisco PDRN EXO Skin Booster is the one vial that holds both actives at ratios you would otherwise build out yourself over two separate serums. Pair it with a Dr. Pen device or a derma roller from our microneedling collection. If you would like help deciding between the boosters in the wider range, email us on help@purederma.co.uk and we will point you at the vial your skin is asking for.
