What Is PDRN? The Salmon DNA Ingredient, Explained
PDRN is everywhere in K-beauty — in creams, ampoules and especially under-eye patches. Here is what it actually is, where it comes from, what the research says, and what a PDRN patch can realistically do for you.
What is PDRN? The short answer
PDRN stands for polydeoxyribonucleotide. Behind the long name is a simple idea: it is a purified mixture of DNA fragments, typically somewhere between 50 and 1,500 kDa in size. On an ingredient list you will most often see it written as sodium DNA, and in marketing as "salmon DNA", "salmon PDRN" or simply "PDRN".
It became famous in Korea as the active ingredient in in-clinic "skin booster" injections. As interest exploded — search interest in PDRN reportedly grew many times over between 2024 and 2025 — brands started adding it to creams, serums, ampoules and, of course, PDRN eye patches.
Where does PDRN come from?
Researchers first isolated PDRN from human placenta. Today, cosmetic and pharmaceutical PDRN is mostly extracted from the sperm cells (milt) of salmonid fish such as chum salmon and rainbow trout, then highly purified so that what remains is a clean DNA fraction. That is why "salmon sperm facial" headlines keep going viral — they are technically accurate, if not very glamorous.
A second group of products uses plant-derived PDRN, for example from ginseng. These are fish-free and appeal to vegan shoppers, but they are a different raw material. We cover the salmon-versus-plant question in detail in our salmon DNA skincare guide.
How researchers think PDRN works
In laboratory and clinical research, the main studied mechanism of PDRN is activation of the adenosine A2A receptor. This receptor is part of a signalling pathway linked to how tissue responds after stress, which is why PDRN has been studied in several medical settings over the years.
It is worth being precise here. Those findings come mostly from injected PDRN and from lab models. When PDRN sits on the surface of your skin in a cream or a patch, the situation is different: the skin barrier is designed to keep large molecules out, and topical research is still at an early stage.
What does the evidence actually show?
Two recent papers give a balanced picture:
- A 2026 systematic review of randomized trials found that polynucleotide and PDRN procedures — mostly injectables — improved wrinkle and scar outcomes. The authors also point out that the studies were small and varied, which limits how firm the conclusions can be.
- A 2026 randomized, double-blind, split-face study compared a topical PDRN eye cream with a retinol cream over 28 days and found improvements in measurements of periocular wrinkles and eye bags on the PDRN side. It is an encouraging result, but the authors had industry affiliations and the product was a cream, not a patch.
The fair summary: PDRN has a real research background, the strongest data are for injections, and topical evidence is promising but young.
PDRN vs polynucleotides (PN) and Rejuran
You will also see the term polynucleotides, or PN. Both PDRN and PN are DNA-derived fragments, usually from salmon; they differ mainly in the length of the fragments and how they are processed. Brands such as REJURAN use their own proprietary versions — REJURAN calls its ingredient c-PDRN — and the company is best known for its in-clinic line. For a shopper choosing an eye patch, the label name matters less than the overall formula and how the patch feels to use.
PDRN patches benefits: what you can realistically expect
Because an eye patch combines PDRN with a water-rich hydrogel and partner ingredients, the benefits you notice are mostly cosmetic and fairly quick:
- Hydration. The gel floods the thin under-eye skin with moisture, so it looks smoother and plumper straight afterwards.
- Cooling. Hydrogel feels cool on the skin — even more so straight from the fridge — which helps puffy mornings look fresher.
- A visibly de-puffed look. Especially when the patch also contains caffeine.
- A brighter-looking under-eye. Often helped by niacinamide or other brightening partners.
- A ritual you keep. Twenty minutes, no mess, easy to repeat — consistency is what makes any skincare routine feel worthwhile.
Do PDRN eye patches work — and are PDRN patches worth it?
If your goal is under-eyes that look more rested, hydrated and smooth, PDRN eye patches do that job well, and a 60-patch jar keeps the cost per session modest. They are especially good for people who like quick, low-effort routines and for anyone who wakes up puffy.
They are not worth it if you expect a patch to replace professional procedures or change deep structural features such as hollows or fat pads. For that, a qualified professional is the right person to talk to. For everything else, compare formulas on our PDRN eye patch comparison and see how to use PDRN eye patches for the best results.
Our pick if you want one jar for hydration and a fresher-looking under-eye: Feel1 PDRN Eyepatch (salmon PDRN, collagen, caffeine, niacinamide). View deal · all 10 compared. Commercial link, we are commercially connected with Feel1.
FAQ
What does PDRN stand for?
PDRN stands for polydeoxyribonucleotide. It is a purified mixture of DNA fragments, most often extracted from salmon or trout milt, and it appears on cosmetic ingredient lists as sodium DNA. The name sounds clinical, but in skincare it is used as a hydrating, skin-conditioning ingredient in creams, serums and eye patches.
Is PDRN the same as salmon DNA?
In skincare, mostly yes. "Salmon DNA" is the everyday name for PDRN taken from salmonid fish. Not all PDRN comes from salmon, though: trout is also used, and some brands sell plant-based PDRN, for example from ginseng. Check the product page or ingredient list to see which source a brand uses.
Is topical PDRN as effective as PDRN injections?
No one should expect that. Injected PDRN is placed directly into the skin by a professional, while a cream or patch sits on the surface, where the skin barrier limits what gets through. Early topical studies look encouraging, but the evidence is much thinner than for injections. Think of patches as a cosmetic hydration step.
Is PDRN safe in skincare?
PDRN is generally regarded as a gentle, well-tolerated cosmetic ingredient. Reactions to eye patches are more often caused by partner ingredients such as retinoids or fragrance. Patch-test new products, avoid broken skin, and if you have a fish allergy, choose a plant-based PDRN product or ask your doctor first.
How long until I see results from PDRN patches?
The hydrating, cooling and de-puffing effect is visible right after a 15 to 20 minute session. Changes in how smooth and bright your under-eyes look over time build with regular use, so give a jar a few weeks of consistent use before judging it.
Sources
- Wikipedia — Polydeoxyribonucleotide: https://en.wikipedia.org/wiki/Polydeoxyribonucleotide
- Marine Drugs (2021) — review of PDRN and polynucleotides from marine sources, PMC8224764: https://pmc.ncbi.nlm.nih.gov/articles/PMC8224764/
- Cureus (July 2026) — systematic review of randomized trials on polynucleotides/PDRN, PubMed 42572627: https://pubmed.ncbi.nlm.nih.gov/42572627/
- PLoS One (July 2026) — randomized split-face study of a topical PDRN eye cream vs retinol, PubMed 42430369: https://pubmed.ncbi.nlm.nih.gov/42430369/