“Salmon sperm facial” is possibly the least appealing phrase in beauty right now — and somehow it is the one everybody is searching for. Behind the headline is an ingredient called PDRN, and it has gone from a specialist medical material to a word on the front of half the bottles in K-beauty.
Then a second version appeared: vegan PDRN, made from plants. Same three letters, different origin story, very different amount of evidence.
Most articles about PDRN are written from other articles about PDRN, and the same impressive-sounding numbers get passed around until nobody can find where they came from. So we went to the research papers — and then we turned over every PDRN box on our own shelves and counted.
Short version: PDRN is worth your money, if you buy a product that contains a real amount of it. Here is how to tell.
What PDRN actually is
PDRN stands for polydeoxyribonucleotide. Underneath the long word it is simple: DNA, broken into fragments. Not a lab-designed imitation of something natural — actual genetic material, purified and cut down.
DNA is built from the same four building blocks in every living thing. A salmon's DNA and yours are made of the same letters in a different order, which is why salmon was chosen in the first place.
Two things worth knowing before you shop:
- On an ingredients list, PDRN appears as Sodium DNA. “PDRN” is a trade term, not an official ingredient name. If a product markets PDRN but there is no Sodium DNA on the back, be curious about what is actually in there.
- Sodium DNA tells you nothing about source or amount. It is the same ingredient name whether it came from a salmon or a ginseng root, and whether there is a lot or a trace.
Where the reputation came from
PDRN is not new. It has been used in medicine since the 1990s, and the research is genuinely substantial — including a 2014 trial in diabetic foot ulcers where PDRN roughly doubled the rate of complete healing against placebo.
Here is the catch every honest article has to mention: in that trial, and in almost all the impressive research, the PDRN was injected. A serum sits on the surface of your skin. An injection does not. Different product, different route, different regulatory category entirely.
What one real study of PDRN cream found
Until recently there was almost nothing on topical PDRN in humans. In July 2026 that changed: a randomised, double-blind, split-face study was published in PLOS One (Ye and colleagues).
Thirty-one Chinese women aged 35 to 55, all with sensitive skin and existing crow's feet, used a 0.1% PDRN eye cream around one eye and a 0.1% retinol cream around the other, twice a day for 28 days. The PDRN side showed around a 20% reduction in crow's feet wrinkle area, against roughly 6–7% for retinol.
Encouraging — and worth reading carefully. It is 31 people over four weeks. There was no do-nothing group, so it shows PDRN beat retinol over 28 days, not that it beat doing nothing. It used one specific raw material, so it does not automatically apply to every PDRN product on a shelf. And three of its five authors work for a skincare company, with the PDRN supplied by its manufacturer.
One study, then. A good one, and a genuinely encouraging result. Not a settled question.
Concentration matters. So does everything else in the bottle.
Yes, the dose matters. There is an enormous difference between a product built around PDRN and one with a whisper of it added so the word can go on the front. We have both in our own range, and we will show you exactly which is which further down.
But a big number alone does not make a good product, and a smaller one does not make a bad one. Skincare is a cocktail. A formula with a moderate PDRN level plus proper niacinamide, real peptides and a well-built base will often do more for your face than a high number floating in water. You are buying the whole bottle, not one ingredient.
So there are two honest ways to buy PDRN. The near-pure ampoule, where PDRN is the point and there is very little else. Or the cocktail, where it sits alongside niacinamide, peptides and vitamin C and the orchestra is the reason the product works. Most K-beauty PDRN products are the second kind. That is not a con — it is just worth knowing which one you are holding.
A rough ladder, honestly labelled
The industry has settled on a working set of bands. Treat these as trade convention rather than proven science — no dose-response study in human skin exists to confirm them — but they are a reasonable sanity check:
| Level | What it usually means |
|---|---|
| Under 100ppm | A trace. The product may still be excellent, but PDRN is not why. Judge it on the rest of the formula. |
| 1,000ppm (0.1%) | The only dose ever tested in a published randomised human trial of topical PDRN — where it outperformed retinol on crow's feet over 28 days. |
| 5,000–10,000ppm (0.5–1%) | The band most Korean brands aim at for a leave-on serum or ampoule. Where you would expect a product that is genuinely about PDRN to sit. |
| Above 10,000ppm | Usually a near-pure ampoule. Check what is being counted — and note that more is not automatically better. |
Be careful with the numbers themselves
You will see confident claims that the effective range is 300–500ppm, or that 1,000ppm is the minimum, or that 20,000ppm is “clinically optimal”. We tried to trace every one of those to a study and could not find a published source behind any of them.
Two specific traps to watch for:
- The number often belongs to something else. More than once we have traced a big “PDRN ppm” figure quoted online back to the niacinamide on the box. If you see 20,000ppm, check what is actually being counted — 20,000ppm is 2%, and 2% niacinamide is one of the most common formulas in K-beauty. There is an example of exactly this further down.
- Nobody independently verifies it. There is no standard test a brand must pass. Which is why brands that print their figures on the statutory label, where they are legally accountable, deserve more trust than brands that put them in an Instagram caption.
The two-minute check that works on any product
Read the back, not the front. Ingredients are listed in order of quantity, down to 1%. If Sodium DNA sits in the top ten, the brand has committed to it. If it is thirty-somethingth, below the fragrance, the front of the box is doing the heavy lifting. One caveat: below 1%, brands can list in any order, so position is a strong hint rather than proof.
This is the single most useful skill in skincare shopping, and it works on every ingredient, not just this one.
The bit the industry does not advertise: can it even get in?
PDRN fragments weigh somewhere between 50 and 1,500 kDa. The rough rule of thumb for a molecule passing through intact skin on its own is around 500 Daltons. PDRN is on the order of a hundred to a few thousand times bigger than that.
This is not a sceptic's talking point — it is stated openly in the literature. A 2025 paper in Pharmaceutics puts it plainly: PDRN's topical use “is limited by its high molecular weight and anionic charge, which restrict skin penetration.”
Which is exactly why an entire research field exists to get around it — shrinking the fragments, changing their charge, wrapping them in liposomes, delivering them with spicules. So alongside the ppm number, these three things matter:
- Particle size. A smaller, nanosized fragment at a modest concentration can outperform a huge number in a basic water base. If a brand talks about particle size, that is a good sign.
- Delivery. Liposomes, encapsulation and spicule technology all exist specifically to move PDRN past the barrier.
- Purity. Lower-grade PDRN carries protein residue that can irritate. Few brands disclose it — the ones that do are telling you something.
Salmon PDRN versus plant PDRN
| Salmon PDRN | Plant PDRN | |
|---|---|---|
| Source | Purified DNA from salmon or trout milt | Cultured ginseng root is the one with published work behind it. Other plants appear on labels, but what is in the bottle is often an extract rather than isolated DNA |
| Evidence | Decades of medical literature (injected), plus the one 2026 topical trial | A 2023 paper showing ginseng PDRN acts on the same cell receptor as salmon PDRN — but entirely in lab-grown tissue. No human trials at all |
| Texture | Richer, cushioned, usually with peptides and collagen | Lighter, fresher, usually with vitamins and brightening ingredients |
| Choose it if | You want the option with the most research behind it | You avoid animal-derived ingredients, or you have a fish allergy |
Our honest read: salmon has the stronger evidence, plant has the stronger ethics case, and there has never been a head-to-head study. If you avoid animal ingredients, choose plant with a clear conscience — just check the back of the pack, because a lot of “vegan PDRN” products do not disclose whether isolated plant DNA is in there at all.
One thing that catches everybody out
A product can be named after a plant and still be salmon-derived. Fruit in the name is often flavour and colour rather than the active. If the vegan question matters to you, look for an explicit vegan claim on the packaging and check the ingredients list — do not go by the name.
How we would choose from our own shelves
Here is the part no other shop will do for you. We took every PDRN product we stock, pulled up its actual ingredients list, and counted where Sodium DNA falls. Not what the front of the box says — where it really sits. It is a very wide spread.
The highest PDRN placement in our range salmon
MEDICUBE PDRN Pink Peptide Serum (30ml) — Sodium DNA sits eighth of forty ingredients, higher than anything else we sell, alongside a five-peptide complex, niacinamide sixth and hydrolysed collagen. Medicube does not publish a ppm, so we are going on placement rather than a number. If you are trying PDRN once to see what you think, make it this one. Step 6, morning and night.
The one that answers the penetration question salmon
GENABELLE PDRN VITA Toning Ampoule (30ml) — remember the particle-size point? This is the one product in our range that addresses it. Genabelle's HTD-GENACOMPLEX™ uses two molecular weights of the same fish-derived DNA, and you can see both on the ingredients list: Sodium DNA at tenth of forty, and Hydrolyzed Sodium DNA — the smaller, broken-down fragment — further down. A claim you can actually check.
Genabelle publishes a figure too — 5,000ppm, which puts it in the band most Korean brands aim at. That comes from the brand rather than the ingredients list, so treat it as their claim, but they are willing to put a number to it, which many are not. Niacinamide sits third. In a watery vitamin B, C and E base. Choose this if your skin looks tired and uneven rather than dry. Step 6, morning and night.
If you would rather swap a step than add one salmon
MEDICUBE PDRN Pink Cica Soothing Toner (250ml) — Sodium DNA sits nineteenth of thirty-six here, further down than in the serum. Think of it as a very good PHA, centella and niacinamide toner with PDRN alongside, replacing your current one at step 4. Genuinely fragrance-free.
The vegan option not fish-derived
DR. ALTHEA Aqua Marine Jelly Mist (100ml) — Dr. Althea lists this one as vegan, which rules out a fish source. The brand does not say what it is derived from, does not publish a concentration, and it sits nineteenth of twenty-five on the list. Buy it because it is a lovely refreshing mist that happens to be the vegan PDRN option, not because you expect a high dose. If you have a fish allergy, check the full ingredients list on the product page before buying. Step 5, any time.
If you would rather have the whole routine the cocktail approach
BE THE SKIN Vitavita Raspberry — remember the two ways to buy PDRN? This is the cocktail, and it is one of very few complete routines from a single brand we stock. Be The Skin prints its figures on the carton, so we can tell you exactly what you are getting:
- Toner Pads — step 4. PDRN 50ppm, 22nd of 40
- Raspberry PDRN Ampoule — step 6. PDRN 2ppm, 32nd of 48. A brightening ampoule, not a PDRN dose
- Circle Zero Eye Cream — step 8. No PDRN in it at all
- Raspberry PDRN Cream — step 9. PDRN 100ppm, 20th of 41
Those are trace-to-low numbers and we are not going to dress them up. So why recommend the line at all? Because of what else is in it: 2% niacinamide in the pads and cream, niacinamide throughout the rest, eleven peptides in every single product, glutathione and two stable vitamin C derivatives in the pads.
And here is that trap from earlier, in the wild: 2% is 20,000ppm, and that is the number you will find quoted online as this line's “PDRN content”. It is not. It is the niacinamide, printed as such on the box — you can see it in the photo further up. The PDRN is 50ppm.
Buy this as what it honestly is — a well-built brightening routine designed to layer, that happens to carry a little PDRN. For a lot of people that is the more useful thing to own. Not suitable for vegans: the PDRN is fish-derived, and the cream and eye cream contain collagen.
And the rest of the shelf, for completeness
Three more products in our PDRN collection did not make the picks, and it seems only fair to say why:
- MEDICUBE PDRN Pink Collagen Gel Mask — Sodium DNA 29th of 43. A lovely cooling hydrogel mask led by niacinamide and collagen. Buy it for that.
- MEDICUBE PDRN Pink Hyaluronic Cream — Sodium DNA 31st of 58. But it has five ceramides with cholesterol and phytosphingosine, and eight forms of hyaluronic acid. Genuinely good, just not for the PDRN.
- MEDICUBE PDRN Booster Moisturizing Gel — Sodium DNA 30th of 49, despite the name. A generous 300ml lightweight gel, and the hyaluronic acid is the reason to own it.
None of those are bad products. They are just not PDRN treatments, and we would rather you spent your money knowing that.
How to use it
PDRN turns up at almost every step now — toners, mists, creams — but the step 6 serum or ampoule slot is where a real dose usually lives, and where you would add it first. Morning, night or both.
- Apply to slightly damp skin. These formulas sit better on skin still damp from your toner.
- No famous conflicts. PDRN is not an acid, a retinoid or an exfoliant, so there is no ingredient it is known to clash with. It sits happily alongside vitamin C and retinal — though do check the individual product page if you are layering a strong pure vitamin C.
- Start one thing at a time. If you are adding PDRN, add PDRN — not PDRN plus a new acid plus a new retinal. Otherwise you will never know what did what.
- Give it four to six weeks. The comfortable, hydrated feel turns up in days. Anything to do with how your skin looks takes a full skin cycle.
So — is it worth it?
Yes. With one condition: buy a product that actually contains a meaningful amount of it.
PDRN has a real research history, a promising first human trial, and Korean brands are not pouring money into it for nothing. The products that carry it properly tend to be beautifully made in general — thoughtful peptides, sensible niacinamide, textures you will look forward to using.
What we will not tell you is that any bottle with those four letters on the front does the same thing. The gap between the best and the weakest PDRN products is enormous, and it is invisible unless you turn the box over. That is the whole reason we wrote this, and why every recommendation above comes with its position on the ingredients list attached.
Start with one of the picks, give it a full skin cycle, and keep wearing your sunscreen. If it suits you, you will know.
This article is general guidance and not medical advice — we are not dermatologists. If you have a diagnosed skin condition or you are using prescription treatments, please check with your GP or dermatologist. Always patch test a new product. If you have a fish allergy, check the full ingredients list before using a salmon-derived product.