Ingredient dossier Nº 023 / The verified record
Polynucleotides / PDRN ("Salmon DNA")
SODIUM DNA
Effective concentration, the pH it needs, how the derivatives compare, stability in the bottle, and the open questions — every scientific claim on this page links to its source.
- skin conditioning
- soothing
- wound-healing support
- skin-regeneration support
- humectant
Editorial verdict / Social intelligence
A genuinely impressive injectable 'skin booster' — but the topical serum version is promising-and-unproven, not the same treatment in a bottle. 1
- Beauty benefit
- Polynucleotides / PDRN ('salmon DNA') are DNA-derived regenerative biopolymers that stimulate fibroblasts, collagen, and tissue repair — the buzziest 'skin booster' in aesthetics, famous for restoring skin quality, hydration, and bounce.
- Does it work
- Yes — when it's INJECTED. The strong clinical evidence is for in-clinic polynucleotide fillers/'skin boosters' placed in the dermis: a randomized split-face trial against hyaluronic-acid filler, an aesthetic-medicine consensus, and a systematic review all support the injectable. Topical 'salmon DNA' serums are a different story: they use the same ingredient, but their evidence is mostly lab-based, and a large DNA biopolymer doesn't easily penetrate intact skin — so treat a serum as a promising, soothing hydrator, not a substitute for the injectable results. See the science below →
Consensus strength
ModerateAesthetic-medicine consensus and reviews are strongly positive on INJECTABLE polynucleotides for skin rejuvenation and quality; the topical-cosmetic evidence is early and largely in-vitro, and the central open question for serums is whether a large DNA biopolymer penetrates intact skin at all.
01 / What it does
What it does
Polynucleotides (PN) and polydeoxyribonucleotides (PDRN) are DNA-derived biopolymers — chains of deoxyribonucleotide fragments, traditionally purified from salmon or trout sperm DNA (hence the 'salmon DNA' nickname), with newer plant-derived versions emerging. Their biological activity is well characterized: PDRN binds the adenosine A2A receptor and feeds the nucleotide 'salvage pathway', which together stimulate fibroblast proliferation and migration, collagen and extracellular-matrix production, angiogenesis, and a reduction in inflammation — the toolkit of tissue repair. This is why PDRN earned a real place in wound-healing medicine and why injectable 'polynucleotide' or 'skin booster' treatments have become popular in aesthetic clinics for skin quality, hydration, and fine lines. The crucial distinction for skincare shoppers: nearly all of the impressive human evidence comes from PN injected into the dermis by a practitioner, not from a cream or serum. Topical 'salmon DNA' cosmetics borrow the same ingredient and the mechanism is plausible, but their evidence is largely laboratory-based, and whether a large DNA biopolymer penetrates intact skin from a leave-on product in meaningful amounts is an open question.
- Review Polydeoxyribonucleotides (PDRNs) and polynucleotides (PNs) are DNA-derived biopolymers (typically ~50–1500 kDa) studied since the 1990s for wound healing and skin rejuvenation, and are commercially available in gels, creams, serums, masks, and injectables. 1
- Study Polydeoxyribonucleotide (PDRN), a mixture of deoxyribonucleotide polymers, stimulates the A2 purinergic (adenosine A2A) receptor with no toxic or adverse effect, increasing VEGF expression and angiogenesis to promote wound healing in a diabetic mouse model. 2
- Study PDRN exerts its biological effects via adenosine A2A receptor and salvage pathway activation; a low-molecular-weight PDRN enhanced skin-cell proliferation and migration and upregulated extracellular-matrix genes (COL1A1, COL5A1, ELN, FBN1) and epidermal-barrier markers in vitro. 3
- Review PDRN improves impaired wound healing through local and systemic administration by promoting cell migration and growth and angiogenesis and by reducing inflammation. 4
02 / Effective concentration
What percentage actually works
Effective range
No established topical concentration. The clinical evidence is for injected polynucleotide fillers/'skin boosters' dosed by a practitioner
Because the human evidence is overwhelmingly from intradermal injection, there is no validated topical effective concentration. Injected protocols are defined by the device and the practitioner (volume, number of points, number of sessions), not by an over-the-counter product strength, and topical PDRN serums rarely disclose a meaningful standardized amount.
In the clinical studies, polynucleotide is delivered as an injectable filler or 'skin booster': for example, intradermal long-chain PN filler given over multiple points and several sessions, or PN filler compared head-to-head against hyaluronic-acid filler in a split-face trial. These are in-office procedures dosed by the injector. Topical cosmetic PDRN borrows the ingredient but operates under completely different constraints (it has to cross the stratum corneum), and there is no dose-response work establishing what topical concentration, if any, is effective.
- Study In a five-patient study, intradermal long-chain polynucleotide filler (about 0.05 mL injected across 40 points per cheek over four sessions at two-week intervals) improved pore size and skin thickness, with skin tone and wrinkles improved in older patients and no serious side effects. 5
- Study In a randomized, double-blind, split-face trial in 27 subjects, polynucleotide filler was injected into the periocular area on one side versus non-cross-linked hyaluronic-acid filler on the other, three times at two-week intervals. 6
03 / pH requirement
The pH it needs
Target pH
No pH gate — the limiting factor for topical use is penetration of a large DNA biopolymer, not pH
Polynucleotides are not pH-activated actives, so there is no acidic-pH requirement the way there is for AHAs or vitamin C. The meaningful formulation challenge is size: PDRN/PN span a broad and relatively high molecular-weight range, and large biopolymers do not readily cross intact skin. In injectable use this is bypassed entirely (the material is placed in the dermis); in a topical product, penetration is the central unanswered question, and some cosmetic developers pursue lower-molecular-weight fractions or delivery technologies to address it.
- Review PDRNs/PNs span a broad molecular-weight range (commonly ~50–1500 kDa, with some fragments far larger), which is directly relevant to whether they can cross intact skin from a topical product versus being injected. 1
04 / Derivative ladder
How the derivatives compare
Every derivative trades a measure of proven activity for stability or gentleness. Skin conversion is the question that matters — a more stable molecule only helps if your skin can turn it back into the active form.
Polynucleotides / PDRN ("Salmon DNA") has no meaningfully used cosmetic derivative ladder — it is formulated as the free acid itself. That is the form the research below was run on, so there is no conversion step to discount.
05 / Stability & storage
Stability in the bottle
As DNA-derived biopolymers, polynucleotides require purification and careful handling, and their biological activity depends on molecular weight and purity rather than on a single small-molecule concentration. The field is actively standardising terminology and molecular-weight fractions ('highly purified technology', defined MW ranges), and different fractions show different activity — so formulation and sourcing matter more than for a simple actives. Published stability data specific to topical cosmetic PDRN are limited.
- Study Different molecular-weight fractions of PDRN show different biological activity — a low-molecular-weight fraction was the most active for proliferation, migration, and ECM-gene upregulation in vitro — so molecular weight and purity, not just presence, determine effect. 3
In practice Buy it in an opaque, airless, or amber container, store it cool and out of the light, and treat a colour shift toward orange or brown as the signal to replace it — the molecule is telling you it has already oxidised.
06 / How to use it
How to actually use Polynucleotides / PDRN ("Salmon DNA")
- When
- AM/PM — Serum step after cleansing.
- Pairs well with
- hyaluronic acid, peptides, niacinamide.
- Apply apart from
- Nothing major — it layers comfortably with most actives.
- What to look for
- A topical "Sodium DNA" serum (note: the strong evidence is for the injectable).
- Heads-up
- Manage expectations — topical penetration is unproven; fish-derived (not vegan).
Practical guidance for routine placement — not a substitute for a dermatologist’s advice for your skin.
07 / The database
Polynucleotides / PDRN ("Salmon DNA"): measured product rankings coming soon
Ranked by $ per gram of active — what the working ingredient actually costs you, not the sticker price. Rows we have reviewed in full link through; the rest are data points from the same crawl.
Buy medicube on Amazon $18.90 Top-ranked pick · affiliate link
No measured products yet — this active's price-per-gram rankings will appear here as products are added.
In the meantime, see how to use Polynucleotides / PDRN ("Salmon DNA") and what to look for on a label .
Contains it, but doesn't disclose a percentage: medicube medicube PDRN Pink Peptide Serum with Salmon DNA ; TOSOWOONG TOSOWOONG Pink Peptide 12 PDRN Serum with Salmon DNA
08 / Safety
Is it safe?
Cosmetic Ingredient Review status
Topical DNA-derived cosmetic ingredients are used in skincare; there is no PubMed-indexed primary CIR monograph to cite here as a PMID. Injectable polynucleotide procedures are regulated as medical devices/treatments in many markets.
Polynucleotides have a reassuring tolerability profile. Injectable PN/PDRN treatments are generally well tolerated, with the usual injection-related effects (transient redness, swelling, bruising at injection points) and a favourable safety record in the aesthetic-medicine consensus literature; serious adverse events are uncommon. The main ingredient-specific consideration is origin: traditional PDRN is purified from fish (salmon or trout) sperm DNA, which is relevant for anyone avoiding animal-derived ingredients or with fish allergies — newer plant-derived PDRN (from Panax ginseng or Paeonia) is being developed as an alternative. For topical products, the safety bar is low because penetration is limited; the realistic concern is over-promising, not harm.
- Study Intradermal long-chain polynucleotide filler produced no serious side effects across the treated patients. 5
- Study An aesthetic-medicine consensus panel provided recommendations for the safe and effective use of highly purified polynucleotide (PN-HPT) injectable devices for skin rejuvenation. 7
- Study Plant-derived PDRN purified from Panax ginseng adventitious root promoted keratinocyte and fibroblast proliferation and improved the skin barrier in vitro, supporting a non-animal alternative to salmon-derived PDRN. 8
09 / The limits of the evidence
What we don't know yet
Most of what you read about this ingredient is stated with more certainty than the evidence earns. Here is exactly where the record thins out — so you can weigh the claims above for yourself.
- The strongest clinical evidence is for INJECTED polynucleotides (fillers / 'skin boosters') placed in the dermis by a practitioner — not for topical serums or creams. Results from injections do not transfer to a leave-on cosmetic.
- Topical PDRN cosmetic evidence is largely in-vitro or preclinical (cell culture, plant-derived extracts); whether a large DNA biopolymer penetrates intact skin in meaningful amounts from a leave-on product is unresolved.
- A frequently-cited early phase III crow's-feet polynucleotide-filler trial was RETRACTED; it is deliberately excluded here, and marketing that still cites it should be treated with caution.
- 'PDRN' and 'PN' cover a broad molecular-weight range and multiple sources (salmon, trout, ginseng, peony); activity differs by molecular weight and purity, so products are not interchangeable.
- Much of the aesthetic-medicine literature is small, industry-associated, or produced by a limited number of groups, and long-term independent topical data are sparse.
- Traditional PDRN is fish (salmon/trout) sperm DNA, relevant for fish-allergic or animal-ingredient-avoiding users; plant-derived alternatives are newer and less validated.
10 / What people say
What formulators and users say
What works
- Common Injectable polynucleotide 'skin boosters' improve skin quality and fine lines in clinical studies 12
intradermal long-chain PN filler injection seems to be an effective and safe treatment for skin rejuvenation. Study
- Common Real regenerative mechanism — stimulates fibroblasts, collagen/ECM, and angiogenesis via the adenosine A2A receptor 34
Polydeoxyribonucleotide (PDRN), a compound having a mixture of deoxyribonucleotide polymers, stimulates the A2 purinergic receptor with no toxic or adverse effect. Study
- Common Well tolerated, with a long track record in wound healing and tissue repair 5
Polydeoxyribonucleotide (PDRN) has been used to improve wound healing through local and systemic administration thanks to its ability to promote cell migration and growth, angiogenesis, and to reduce inflammation on impaired wound healing review
What to know
- Common The headline results are from INJECTIONS, not creams — topical 'salmon DNA' serums have mostly lab-based evidence and a real skin-penetration question 67
Polydeoxyribonucleotide (PDRN) has the ability to regenerate skin cells and improve the skin barrier and wound healing. Study
- Some It's traditionally fish-derived (salmon/trout sperm DNA) — a consideration for fish allergies or anyone avoiding animal ingredients 6
This study investigated the possibility of replacing animal-derived PDRN with plant-derived PDRN. Study
What you'd only know from the reviews
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The 'skin booster' people rave about is an in-office injectable that places polynucleotide directly in the dermis — bypassing the skin barrier entirely. A topical serum has to get a large DNA biopolymer through intact stratum corneum, which is the unsolved part. Same ingredient, very different delivery and evidence. 78
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Not all PDRN is equal: activity depends on molecular weight and source. A low-molecular-weight fraction was the most active in lab tests, and plant-derived versions (ginseng, peony) are emerging as non-fish alternatives — so two 'PDRN' products can behave quite differently. 4
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11 / Questions
Frequently asked
- What is PDRN / polynucleotides ("salmon DNA")?
- They're DNA-derived biopolymers — chains of DNA fragments traditionally purified from salmon or trout sperm, which is where the 'salmon DNA' nickname comes from. In skin they work by activating the adenosine A2A receptor and the nucleotide salvage pathway, which stimulates fibroblast activity, collagen and extracellular matrix, blood-vessel formation, and tissue repair. They come in two very different forms: injectables used in clinics, and topical serums/creams — and the evidence is far stronger for the injectable form. 13
- Does polynucleotide / PDRN actually work for skin?
- Yes — for the injected form. Injectable 'polynucleotide' or 'skin booster' treatments have real clinical support: a randomized split-face trial compared PN filler against hyaluronic-acid filler for periocular rejuvenation, an aesthetic-medicine consensus backs highly purified PN injectables, and a systematic review found polynucleotides promising for skin rejuvenation in esthetic medicine. These are in-office procedures, not creams. 69
- Do topical 'salmon DNA' serums and creams work as well as the injections?
- This is the key caveat: almost all of the strong human evidence is for polynucleotide injected into the dermis, not for leave-on cosmetics. Topical PDRN products use the same ingredient and the mechanism is plausible, but their evidence is largely laboratory-based (cell culture and plant-derived extracts), and a large DNA biopolymer doesn't easily penetrate intact skin. Treat a topical 'salmon DNA' serum as a promising-but-unproven hydrating/soothing product — not as a substitute for the clinical injectable results. 81
- How does PDRN work in the skin?
- Its main mechanism is binding the adenosine A2A receptor and feeding the DNA 'salvage pathway', which together stimulate fibroblast proliferation and migration, collagen and extracellular-matrix synthesis, new blood-vessel formation, and a reduction in inflammation. This regenerative, wound-healing biology — demonstrated in animal and cell studies — is what underlies its use for skin quality and repair. 234
- Is it really made from salmon? Is there a vegan version?
- Traditionally, yes — PDRN is purified from salmon or trout sperm DNA, so standard products are animal-derived and may matter to people with fish allergies or those avoiding animal ingredients. Newer plant-derived PDRN, purified from sources like Panax ginseng root or Paeonia, is being developed as a non-animal alternative and has shown comparable cell-level activity in lab studies, though it's less established. 83
- Is polynucleotide / PDRN safe?
- It has a reassuring safety record. Injectable PN treatments are generally well tolerated, with the usual transient injection effects (redness, swelling, bruising) and serious problems uncommon in the consensus literature, and a long-chain PN filler study reported no serious side effects. The main ingredient-specific note is its fish origin (allergy/animal-derived considerations). For topical products the realistic issue is over-promising rather than safety, since penetration is limited. 57
12 / References
Sources
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