Polynucleotides for Skin Rejuvenation: What You Need to Know

Polynucleotides for skin rejuvenation: how salmon-derived DNA fragments may support collagen, elasticity, and wrinkle depth, plus where the evidence stands

Polynucleotides are chains of nucleotides (the building blocks of DNA) typically derived from salmon sperm or roe, which share roughly 95% structural similarity with human DNA. When injected into the dermis, they activate adenosine A2A receptors to reduce inflammation, stimulate fibroblast proliferation to boost collagen production, and act as a biological scaffold for tissue repair. They are gaining traction in aesthetic medicine, particularly in South Korea and Europe, though clinical evidence is still limited compared to established anti-aging treatments.

Key Takeaways:

• Polynucleotides work primarily through adenosine A2A receptor activation, reducing inflammation and stimulating repair ¹²
• A phase III clinical trial showed polynucleotide filler matched hyaluronic acid for crow's feet correction ³
• Clinical studies report improvements in wrinkle depth (-17%), elasticity (+40%), and brightness (+51%) ⁴
• Most polynucleotide treatments are injectable and require a professional; topical options have less evidence ⁵
• Long-term safety data is limited, and no polynucleotide product has FDA approval for skin rejuvenation

How do polynucleotides work on your skin?

The primary mechanism is receptor activation. When polynucleotide fragments enter the dermis, they bind to adenosine A2A receptors on fibroblasts and other skin cells. This triggers an intracellular cascade that does several things simultaneously ¹².

First, it dials down inflammation. A2A receptor activation suppresses pro-inflammatory cytokines, which is relevant for aging skin because chronic low-grade inflammation (sometimes called "inflammaging") accelerates collagen breakdown. Studies on polydeoxyribonucleotides (PDRN, a closely related compound) confirm this anti-inflammatory effect in both lab and clinical settings ¹².

Second, it stimulates fibroblast proliferation. Your fibroblasts are the cells that produce collagen, elastin, and hyaluronic acid. A 1999 study demonstrated that PDRN enhances fibroblast growth through A2 purinergic receptor subtypes, and blocking these receptors eliminated the effect, confirming the mechanism ⁶.

Third, polynucleotides promote angiogenesis by increasing VEGF expression (vascular endothelial growth factor, the protein that drives new blood vessel formation). Better blood supply means better nutrient delivery to skin tissue, which supports ongoing repair ²⁵.

What does the clinical evidence look like?

The evidence base is growing but still young. A 2024 systematic review identified 9 clinical studies evaluating polynucleotides in aesthetic medicine, with generally positive findings but significant methodological limitations ⁴.

The strongest piece of evidence is a phase III randomized, double-blind clinical trial comparing polynucleotide filler to hyaluronic acid filler for crow's feet. Seventy-two patients received three treatments over 12 weeks. The polynucleotide group showed comparable wrinkle improvement to hyaluronic acid, with no significant safety differences ³.

A periocular rejuvenation study using a split-face design found that polynucleotide-treated sides showed higher improvement rates in skin elasticity and hydration compared to hyaluronic acid, though overall visual improvement scores were similar between the two ⁷.

One study on facial rejuvenation reported wrinkle depth reduction of 17.1%, elasticity improvement of 39.6%, and brightness improvement of 51.1% ⁴. These numbers are encouraging but come from studies without placebo control groups, which limits how confidently we can attribute the improvements to polynucleotides specifically.

For comparison, tretinoin has randomized controlled trials showing 80% increases in collagen formation and fine line improvements of 40-60% over similar timeframes ⁸.

What is the difference between polynucleotides, PDRN, and PN-HPT?

These acronyms get thrown around interchangeably, but they refer to different things.

PDRN is the most studied of the three. It is classified as a pharmaceutical in some countries and has the most published research on wound healing and tissue repair ¹². Polynucleotides (PN) is the broader umbrella term covering longer-chain DNA fragments used primarily in aesthetic treatments. PN-HPT is a trademarked technology for a specific purification process ⁵⁹.

The practical takeaway: when you see "polynucleotide treatment" at a clinic, ask which specific product they use and whether it is PDRN, PN, or PN-HPT. They have overlapping but not identical evidence profiles.

Who is a good candidate for polynucleotide treatments?

Polynucleotides are most interesting for a specific set of skin concerns and patient profiles.

Strong candidates: People with early to moderate signs of aging who want improved skin quality (texture, elasticity, hydration) rather than volume replacement. The anti-inflammatory properties also make polynucleotides appealing for sensitive skin types who struggle with retinoid irritation ⁴⁵.

Potentially good candidates: People with under-eye hollowing or crepey skin in the periorbital area. The split-face trial showed promising results in this zone specifically, with better elasticity improvements than hyaluronic acid ⁷.

Who should think twice: Anyone expecting polynucleotides to replace retinoids for collagen building. The collagen-stimulation evidence for retinoids is vastly more robust. Anyone on a tight budget should also consider that injectable polynucleotide treatments typically cost $300-1,500 per session with multiple sessions recommended ⁴.

This is currently a professional-only treatment for the most part. While topical polynucleotide products exist (serums, creams, masks), the bulk of clinical evidence comes from injectable delivery. Whether topical formulations can deliver meaningful amounts through the skin barrier is an open question ⁵.

What are the risks and side effects?

The safety profile is reassuring in the short term. Clinical studies consistently report mild, transient side effects: minor swelling, bruising, and redness at injection sites. No significant systemic adverse events have been documented ³⁴⁷.

The biocompatibility makes biological sense. Since salmon-derived polynucleotides share approximately 95% structural similarity with human DNA, immune rejection reactions are rare ²⁵.

The main concern is what we do not know. Long-term studies tracking outcomes beyond 12-24 months are essentially absent from the literature. We do not have multi-year safety data. For a treatment that involves injecting DNA fragments into the dermis, that gap matters.

Regulatory status varies by country. Polynucleotides are not FDA-regulated as a cosmetic ingredient in the United States. In South Korea and parts of Europe, specific products like Rejuran have established market presence but under different regulatory frameworks ⁵⁹.

If you are considering polynucleotide treatment, work with a qualified dermatologist or cosmetic physician who can discuss realistic expectations based on current evidence. Skin Bliss can help you build your daily maintenance routine around the treatment, using the Routine Builder to ensure your at-home regimen supports your professional treatments.

Frequently asked questions

Are polynucleotides the same as salmon DNA?

Polynucleotides used in aesthetic medicine are derived from salmon DNA (specifically from salmon sperm or roe), but they are not raw DNA. The manufacturing process extracts, purifies, and fragments the DNA into specific molecular weight ranges optimized for skin application ²⁵. The high structural similarity to human DNA contributes to their biocompatibility.

How many polynucleotide sessions do you need?

Most clinical protocols involve 3-4 injection sessions spaced 2-4 weeks apart, followed by maintenance sessions every 3-6 months. The phase III trial used three treatments over 12 weeks ³. Results from a single session are typically mild.

Can you use polynucleotides at home?

Topical polynucleotide products (serums, creams, hydrogel masks) exist, but the clinical evidence supporting topical application is much weaker than for injectable delivery. The skin barrier is a significant obstacle for molecules of this size. If you want to try topical polynucleotides, set expectations accordingly and do not expect the same results documented in injection studies ⁵.

Are polynucleotides better than hyaluronic acid fillers?

They serve different purposes. Hyaluronic acid fillers primarily add volume and hydration. Polynucleotides focus on tissue quality improvement: elasticity, texture, and biological regeneration rather than volumizing. A head-to-head trial showed comparable wrinkle reduction but polynucleotides showed higher improvement in skin elasticity specifically ³⁷.

Do polynucleotides hurt?

Injectable polynucleotide treatments involve fine-needle or cannula delivery into the dermis, similar to mesotherapy. Most patients report mild discomfort comparable to other injectable aesthetic treatments. Topical anesthetic cream can be applied beforehand. Side effects are typically limited to temporary swelling and minor bruising ⁴.