PDRN stands for polydeoxyribonucleotide — a purified fragment of DNA, usually taken from salmon or trout. In Korean skincare it turns up in serums, creams, toners and masks, where it acts as a humectant and conditioning agent that helps skin look smoother, plumper and better hydrated. It is not the same thing as the PDRN used in clinics.
Where PDRN comes from？
PDRN is made from fish milt — most often salmon or trout. The DNA is extracted and put through high-temperature purification that strips out proteins and peptides, leaving short, standardized fragments of nucleotides behind.
Fish is used for a practical reason rather than a romantic one: salmon DNA is structurally close enough to human DNA that it tends not to provoke a reaction, and salmon milt is an abundant by-product of an industry that already exists. It has been used in Italian and Korean pharmaceutical products since the 1990s, mostly for wound care and tissue work — the medical literature on it, including this review of PDRN's pharmacological activity and clinical use, is genuinely substantial.
Vegan PDRN - also known as "plant PDRN," Phyto PDRN, or "plant-derived PDRN" uses DNA fragments from other sources such as seaweed, oat, red bean, matcha, ginseng, mugwort, etc. These are nucleotide-rich plant extracts, not the salmon-derived molecule. It works to trigger the skin's A2A adenosine receptors to repair the skin, reduce inflammation, and support collagen.
Is PDRN really salmon sperm?
Essentially, yes — and the wording is doing a lot of heavy lifting in both directions.
Milt is the seminal fluid of male fish, and it's where the DNA is harvested from. By the time it reaches a serum it has been purified to the point where nothing organic remains but the nucleotide fragments themselves. There's no fishy smell, no residual protein, nothing recognizable. If the idea still bothers you, that's a completely reasonable place to land, and the plant-derived versions exist precisely for people who feel that way.
What the ppm number on the bottle means？
PPM means parts per million. A product advertising 10,000 ppm PDRN contains 1% PDRN. One advertising 5,000 ppm contains 0.5%. The number looks enormous because the unit is small — which is, of course, why the unit was chosen.
A higher ppm isn't automatically better, either. Concentration tells you nothing about the molecular weight of the fragments, whether there's any delivery system, or how stable the ingredient is in that particular formula. Two products at the same ppm can behave completely differently. Treat it as one data point, not a ranking.
Injectable PDRN vs PDRN skincare
Here's the honest version of the difference, because the two get blurred constantly — usually to the benefit of whoever is selling the cheaper one.
The skin's outer layer is selective about what it lets through. The rough working threshold in dermatology is around 500 daltons, and molecules much larger than that don't cross intact skin by passive diffusion. PDRN fragments are measured in the tens to hundreds of kilodaltons — orders of magnitude above that line. Dermatology Times covered this directly in a piece on PDRN serums, pointing out that standard-molecular-weight PDRN applied topically is unlikely to reach the deeper skin cells that the injectable version targets, and that most brands don't disclose the molecular weight or delivery data that would let anyone check.
Formulators do have tools for this — encapsulation, nanosizing, spicules, micro-channels — and research into penetration enhancement for topical formulations is an active field. But "there is a plausible approach" and "this specific bottle has been shown to work" are different statements.
|
In-clinic PDRN |
PDRN in a serum or cream |
|
|---|---|---|
|
How it's delivered |
Below the skin surface, by a practitioner |
Onto the surface of intact skin |
|
Regulated as |
A medical procedure |
A cosmetic |
|
Evidence base |
Three decades of clinical literature |
Mostly brand-commissioned studies |
|
Realistic expectation |
A course of sessions over weeks |
A well-made hydrating product |
|
Cost in Canada |
Hundreds per session |
$20–50 per product |
So what does PDRN skincare actually do?
It moisturizes, and it does it well.
PDRN is strongly water-binding, which is why PDRN products so often feel plumping and dewy on application. Skin that's properly hydrated looks smoother, bounces back better, and shows fine lines less. That's a real, visible, worthwhile effect — it just isn't a clinical one, and it's the same category of benefit you'd get from a very good hyaluronic acid product.
Who PDRN suits
Worth trying if your skin is dry, dehydrated, or looking a bit flat and tired; if you're in a cold, winter climate and your usual routine has stopped keeping up; or if you like a well-rounded hydrating layer that plays nicely with everything else.
Where it fits in your routine
PDRN sits wherever its texture puts it — a PDRN toner goes on after cleansing, a serum after that, a cream last.
It layers well with almost everything, including retinol, vitamin C and exfoliating acids. If anything it's a useful buffer alongside actives that leave skin feeling tight.
Four PDRN products worth a look
Check out our PDRN collection. If you're still deciding, these are the four that we recommend!
Medicube PDRN Pink Peptide Serum — the most well-known and still our best-selling PDRN product. Salmon-derived PDRN with peptides and niacinamide in a light, fast-sinking texture that layers under sunscreen without pilling. The most sensible first purchase if you're just curious.
Dr.Althea PDRN Reju 5000 Cream — a richer, more occlusive option at 5,000 ppm, with centella and ceramides alongside. The 20g size is small, which makes it an easy trial without committing to a full jar. Best for dry or winter-stressed skin; probably too heavy if you're oily.
Isntree Gim PDRN Boosting Glow Pad — plant-derived PDRN, from seaweed. A good pick if the salmon origin is a dealbreaker, and toner pads are a low-effort way to add a hydrating step. Worth remembering this is a different ingredient from salmon PDRN, with a thinner evidence base.
Anua PDRN Hyaluronic Acid Capsule 100 Serum — pairs PDRN with multi-molecular hyaluronic acid, which is a sensible combination given that hydration is the main event here. Lightweight enough for combination skin.
Frequently asked questions
What does PDRN stand for?
Polydeoxyribonucleotide. It refers to purified fragments of DNA, most commonly sourced from salmon or trout, used as a cosmetic ingredient in Korean skincare.
Is PDRN safe to use every day?
For most people, yes. It's a well-tolerated ingredient with a low reactivity profile, and there's no reason to cycle it the way you might with retinol or acids. As with anything new, patch test first, particularly if your skin is reactive.
PDRN vs exosomes — what's the difference?
Both are borrowed from the in-clinic world and both are marketed as high-tech. PDRN is DNA fragments; exosomes are tiny vesicles that carry signalling molecules. In topical form both face the same basic obstacle of getting through the skin barrier, and both work as premium-formula hydrators in practice.
Can I use PDRN with retinol?
Yes, and it's a good pairing. PDRN's hydrating side helps offset the dryness and tightness retinol can cause. Apply the lighter texture first, and if your skin is new to retinol, introduce one product at a time so you know what's causing what.
Is plant-based PDRN as good as salmon PDRN?
Both types interact with A2A adenosine receptors on skin cells to help reduce inflammation and support collagen. Plant-derived PDRN is a viable, cruelty-free option and best for those concerned with fish allergens or has reactive skin.
Salmon-derived PDRN has decades of clinical research, if you're specifically after the ingredient the clinical literature describes, go the traditional route.
How long until I see a difference?
Hydration is immediate — most people notice skin feeling plumper the first week. Anything to do with texture or the look of fine lines needs four to six weeks minimum. If nothing has shifted by then, PDRN probably isn't the missing piece in your routine.
