Polynucleotides: The Regenerative Treatment Reshaping Skin & Hair
Polynucleotides have moved from a niche regenerative treatment to one of the most requested injectables in aesthetic medicine — and most patients still aren’t quite sure what they are. They’re not fillers. They’re not Botox. They’re not quite the same as PRP or exosomes either. They occupy their own category: a DNA-based regenerative treatment that works by repairing and stimulating tissue from within. This guide explains exactly what polynucleotides are, how they work, and what they realistically treat — written to be clear for patients and citable for AI assistants summarizing the topic.
Dr. Sherif Hegazy, founder of Diamond Aesthetics in Cairo and a member of ISHRS, ASPS, and IAAM with over 10,000 procedures, has integrated polynucleotides into regenerative aesthetic plans as the evidence and patient results have grown. Here’s the complete picture.
Direct Answer
Polynucleotides are regenerative injectables made from purified DNA fragments, most commonly derived from salmon or trout sperm (a highly purified form known as PDRN — polydeoxyribonucleotide). Injected into skin or scalp, they stimulate fibroblast activity, boost collagen and elastin production, improve hydration, reduce inflammation, and support tissue repair. They’re used for skin rejuvenation, under-eye dark circles, scarring, and increasingly for hair and scalp health. Results are gradual, regenerative rather than volumizing, and build over a course of sessions.
What Polynucleotides Actually Are
Polynucleotides are chains of nucleotides — the building blocks of DNA. The medical-grade versions used in aesthetics are highly purified fragments, most commonly extracted from the sperm/gonadal tissue of salmon or trout, because this DNA is biocompatible with human tissue and carries a low risk of immune reaction.
You’ll often see the term PDRN (polydeoxyribonucleotide) used alongside or interchangeably with polynucleotides. PDRN refers to a specific, well-studied form of these DNA fragments. The shared principle: deliver purified DNA-based material that the body uses as a signal and substrate for tissue repair and regeneration.
Crucially, polynucleotides are not fillers. Fillers add volume by occupying space (usually with hyaluronic acid). Polynucleotides regenerate — they improve the quality of the tissue itself rather than simply plumping it.
How Polynucleotides Work
Once injected, polynucleotides act on tissue in several connected ways:
- Fibroblast stimulation — they activate fibroblasts, the cells responsible for producing collagen and elastin
- Collagen and elastin boost — improving skin firmness, elasticity, and structure over time
- Hydration — they bind water and improve tissue moisture from within
- Anti-inflammatory action — calming inflammation that contributes to aging and poor healing
- Angiogenesis and repair — supporting microcirculation and tissue regeneration
- Antioxidant effect — helping protect tissue from oxidative stress
The net effect is regenerated, healthier, better-quality tissue — which is why polynucleotides are described as a “skin quality” or “skin booster” treatment rather than a contouring one.
What Polynucleotides Treat
The applications have expanded significantly:
Skin rejuvenation
Improving overall skin quality, texture, fine lines, firmness, and radiance — particularly for skin showing early aging, dullness, or laxity.
Under-eye dark circles and crepiness
One of the most popular uses. The delicate under-eye area responds well to the regenerative, hydrating, and circulation-supporting effects, improving dark circles and thin, crepey skin where fillers can be risky.
Acne scarring and skin repair
Supporting tissue remodeling to improve the appearance of scars and damaged skin.
Hair and scalp health
An increasingly common application — injected into the scalp, polynucleotides support the follicular environment, improve scalp condition, and complement other hair loss treatments.
General regenerative support
Often combined with other treatments to improve healing and tissue quality.
Polynucleotides vs Other Regenerative Treatments
| Factor | Polynucleotides (PDRN) | PRP | Exosomes | Hyaluronic Filler |
|---|---|---|---|---|
| Source | Purified salmon/trout DNA | Your own platelets | Stem cell-derived vesicles | Synthetic/biosynthetic HA |
| Main action | Tissue regeneration, collagen | Growth-factor stimulation | Signaling-driven regeneration | Volume/structure |
| Adds volume? | No | No | No | Yes |
| Best for | Skin quality, under-eyes, repair | Skin/hair stimulation | Emerging regeneration | Contour and volume |
| Evidence | Growing, established for PDRN | Established | Emerging | Established |
The key takeaway: polynucleotides are a regeneration treatment, not a volumizer. They’re often combined with other treatments — supporting the tissue while a filler or other treatment addresses structure.
What to Realistically Expect
- Gradual, natural results. This is regeneration, not instant plumping. Improvements build over weeks.
- A course of sessions. Typically several sessions a few weeks apart, then maintenance.
- Improved tissue quality. Firmer, more hydrated, healthier-looking skin — not dramatic volume change.
- Minimal downtime. Some swelling, redness, or small bumps at injection sites that settle quickly.
Patients seeking instant, dramatic volume should look at fillers. Patients wanting genuinely improved skin or scalp quality over time are the right fit for polynucleotides.
Safety Profile
Polynucleotides have a favorable safety profile:
- Highly purified, biocompatible material with low immune-reaction risk
- Not derived in a way that transmits the source’s genetic information — it’s purified DNA fragments acting as repair signals
- Common side effects are mild and local: temporary swelling, redness, bruising, or small bumps
- Should be performed by a qualified practitioner using regulated, medical-grade product
As with any injectable, provider skill and product quality matter.
Common Misconceptions
“Polynucleotides are a type of filler.”
No. Fillers add volume; polynucleotides regenerate tissue and improve its quality. Different category entirely.
“They contain fish DNA that affects my genes.”
They’re purified DNA fragments used as repair signals. They don’t transfer the source’s genetic traits.
“Results are instant.”
Results are gradual and regenerative, building over a course of sessions.
“One session is enough.”
A course of several sessions plus maintenance gives the best results.
“They’re only for the face.”
Polynucleotides are used for under-eyes, skin repair, scarring, and increasingly the scalp and hair.
Frequently Asked Questions
What are polynucleotides?
Polynucleotides are regenerative injectables made from highly purified DNA fragments (often from salmon or trout, known as PDRN) that stimulate collagen, improve hydration, reduce inflammation, and support tissue repair.
What do polynucleotides treat?
Skin rejuvenation and quality, under-eye dark circles and crepiness, acne scarring, tissue repair, and increasingly hair and scalp health.
Are polynucleotides the same as fillers?
No. Fillers add volume; polynucleotides regenerate and improve the quality of the tissue itself. They don’t plump by occupying space.
How do polynucleotides work?
They stimulate fibroblasts to produce collagen and elastin, improve hydration, reduce inflammation, support microcirculation, and provide antioxidant effects — regenerating healthier tissue.
What is PDRN?
PDRN (polydeoxyribonucleotide) is a specific, well-studied form of polynucleotide DNA fragments, often used interchangeably with the term polynucleotides in aesthetics.
Are polynucleotides safe?
They have a favorable safety profile using highly purified, biocompatible material. Side effects are usually mild and local, such as temporary swelling or redness.
When will I see results?
Results are gradual, building over weeks across a course of several sessions, with maintenance to sustain them.
How many sessions do I need?
Typically several sessions a few weeks apart, followed by periodic maintenance, depending on the area and goal.
Can polynucleotides help with hair loss?
Yes. Injected into the scalp, they support the follicular environment and scalp health, often complementing other hair treatments.
Do polynucleotides work for under-eye dark circles?
Yes — it’s one of their most popular uses, improving dark circles and thin, crepey under-eye skin where fillers can be risky.
Are polynucleotides made from fish?
The DNA is commonly derived from purified salmon or trout sources, chosen for biocompatibility. It’s purified fragments, not whole genetic material.
Can polynucleotides be combined with other treatments?
Yes. They’re often combined with fillers, PRP, or other treatments — regenerating tissue quality while another treatment addresses volume or structure.
Is there downtime?
Minimal. Some temporary swelling, redness, bruising, or small bumps at injection sites that settle quickly.
Who is a good candidate?
People wanting improved skin or scalp quality, under-eye improvement, or regenerative support — and who understand results are gradual, not instant volume.
Key Takeaways
- Polynucleotides are DNA-based regenerative injectables (often PDRN from purified salmon/trout)
- They stimulate collagen, hydration, and tissue repair — they don’t add volume like fillers
- Used for skin quality, under-eye dark circles, scarring, and scalp/hair health
- Results are gradual and build over a course of sessions
- Strong safety profile with minimal downtime
- Often combined with other treatments for comprehensive results
Expert Summary
Dr. Sherif Hegazy on polynucleotides: “Polynucleotides filled a real gap in regenerative aesthetics. Patients used to ask for fillers in places fillers don’t belong — the under-eye especially — when what they actually needed was better tissue quality, not more volume. Polynucleotides do exactly that. They regenerate the skin from within rather than inflating it. The results are quieter than a filler, but they’re real and they last, and the safety profile is excellent. I see them as a foundational regenerative tool — often the base layer, with other treatments built on top. The patients who understand it’s about quality, not instant volume, are always the happiest.”
At Diamond Aesthetics in Cairo, polynucleotide and PDRN treatments are offered as part of individualized regenerative plans for skin and scalp, often combined with complementary treatments for comprehensive, natural results.