PDRN — polydeoxyribonucleotide, marketed as "salmon DNA" — is the breakout K-beauty repair ingredient of the last year. It started in Korean clinics as an injectable for wound healing and skin rejuvenation, and the topical cream-and-serum versions rode that reputation into every Olive Young haul. The science is real but modest: short DNA fragments that signal fibroblasts (via adenosine A2A receptors) to step up collagen and repair. The evidence tier is moderate — genuine clinical pedigree, but the strongest data is for in-clinic procedures, not leave-on creams.
That gap between the clinic data and the cream on your shelf is exactly why two label details matter more than any marketing copy: where the PDRN came from, and how much is actually in there.
1. Source: salmon/trout PDRN ≫ plant "phyto-PDRN"
The PDRN with real research behind it is derived from salmon or trout. Recently a wave of products advertise "phyto-PDRN" or "plant-based PDRN" — usually to hit a vegan claim or a flashy concentration. The catch: plant-derived PDRN does not have the same body of clinical evidence as the marine-sourced original. A product can print a huge "PDRN" number on the front and still be the less-studied plant version.
So the first question isn't "does it have PDRN?" — it's "what kind?" Marine (salmon/trout) is the one the clinical literature is actually about.
2. Concentration: the ppm number, not the hype
PDRN is dosed in ppm (parts per million). A label that says "PDRN" with no number is telling you nothing. And a very high ppm on a plant-derived PDRN isn't the win it looks like — 10,000 ppm of the less-studied form is not better than ~1,000 ppm of the salmon form.
A useful way to read the market, roughly highest-evidence-per-dollar first:
- Salmon PDRN, ~1,000 ppm — the sweet spot the clinical work clusters around. Anua PDRN Hyaluronic Acid 100 Moisturizing Cream sits here, paired with hyaluronic acid for a everyday repair-and-hydrate layer.
- c-PDRN, ~2,000 ppm — Rejuran's "DOT" form, from the brand that popularized the in-clinic version. Premium price. Rejuran Turnover Cream (c-PDRN).
- Pink-peptide serums — lighter, layering-friendly delivery. medicube PDRN Pink Peptide Serum, or a targeted Mediheal PDRN Lifting Pad for a quick all-over pass.
- Plant/phyto PDRN, 5,000 ppm — the big number is plant-derived, so weigh the concentration against the weaker evidence base. Dr. Althea PDRN Reju 5000 Cream is a fragrance-free option if you specifically want the vegan route and accept the trade-off.
The point isn't that the high-ppm plant products are bad — it's that "10,000 ppm" on the front of the box is doing marketing work, and the only way to compare honestly is to line up source and ppm together.
How to actually use it
- Layer PDRN after your watery serums, before moisturizer (or as the moisturizer if it's a cream).
- It pairs well with the things it's usually formulated beside — hyaluronic acid, niacinamide, panthenol — and there's no special conflict to avoid.
- Where it earns its keep is post-procedure or post-retinoid repair and general fine-line softening. Don't expect it to clear acne or erase deep wrinkles; those claims stretch the evidence.
The takeaway
When a PDRN product catches your eye, ignore the hero number for a second and ask two things: is it salmon/trout or plant, and what's the ppm? A modestly-dosed salmon PDRN beats a giant-number plant one on the strength of the research. Everything else on the label is decoration.