Biological Mechanisms, Clinical Evidence, and the Role of VITARAN in Skin Regeneration
In recent years, many patients have shifted their expectations in aesthetic dermatology.
Instead of treatments that provide rapid but short-lived changes, there is growing interest in approaches that improve skin quality in a more physiological and sustainable way.
This shift has brought renewed attention to Polynucleotides (PN), not because they are new, but because they are biologically rational and supported by an increasing body of scientific and clinical evidence.
This article aims to provide a comprehensive, evidence-based overview of Polynucleotides (PN) in dermatology, covering their biological structure, mechanisms of action, clinical data, and real-world applications.
VITARAN will be discussed as a representative example of a newer-generation PN product, and its positioning will be compared, where appropriate and fairly, with earlier PN formulations such as Rejuran.
What Are Polynucleotides (PN)?
Polynucleotides are polymer chains composed of nucleotide units, which are the fundamental building blocks of DNA and RNA.
In dermatologic and aesthetic medicine, PN are typically derived from purified fish DNA (commonly trout or salmon trout). Through advanced purification and molecular selection processes, immunogenic components are minimized, allowing safe intradermal or superficial dermal injection in humans.
From a clinical classification perspective, PN belongs to the group of bio-stimulating or regenerative injectables.
They are not volumetric fillers, nor are they pharmacologic agents with direct drug-like effects.
Mechanisms of Action of Polynucleotides in Skin
Based on in vitro studies, animal models, and clinical investigations, the biological effects of PN on skin can be understood through several interrelated mechanisms.
1. Biological Scaffold and Tissue Microenvironment Support
PN act as a temporary biological scaffold within the tissue, creating an environment that facilitates endogenous repair processes.
Experimental data suggest that PN:
- Support fibroblast viability and function
- Improve tissue microenvironment compromised by aging or chronic inflammation
- Promote physiological tissue regeneration without inducing abnormal cell proliferation
This concept underlies the term “regenerative filler”, frequently used in the scientific literature describing PN.
2. Effects on the Extracellular Matrix (ECM)
The extracellular matrix plays a central role in determining skin quality, including elasticity, firmness, texture, and resilience.
Multiple studies indicate that PN:
- Support collagen matrix synthesis and organization
- Help rebalance collagen synthesis and degradation
- Improve the structural integrity of the dermal framework
Clinically, these effects are associated with:
- Improved skin turgor
- Smoother texture
- Reduction in fine wrinkles
- Enhanced skin elasticity
3. Anti-inflammatory Support and Reduction of Facial Redness
A key feature distinguishing PN from many other injectables is their effect on chronic low-grade inflammation at the tissue level.
Although PN are not pharmacologic anti-inflammatory agents, evidence suggests they:
- Reduce tissue stress associated with oxidative damage
- Support restoration of skin homeostasis
- Improve tissue tolerance to external and procedural stressors
Clinically, this translates into:
- Reduced skin reactivity
- Improvement in facial erythema in selected patients
- Enhanced recovery following aesthetic procedures
Several clinical reports describe the use of PN injections, alone or combined with hyaluronic acid, in patients with facial erythema and increased vascular reactivity, demonstrating trends toward reduced redness and improved skin stability over follow-up periods.
4. Role in Photo-aging and Sun-induced Skin Changes
Photo-aging is driven by cumulative ultraviolet exposure, leading to oxidative stress, chronic inflammation, and extracellular matrix degradation.
While PN are not depigmenting agents per se, their regenerative effects contribute to:
- Improved skin texture in photo-damaged skin
- More even skin tone
- Enhanced skin luminosity and light reflection
Clinically, PN-based skin regeneration often results in skin that appears brighter and healthier, even in patients with chronic sun exposure.
5. Time-dependent Biostimulatory Effects
Unlike volumetric fillers, PN do not produce immediate structural changes.
Their effects are time-dependent, reflecting underlying biological repair processes.
In most clinical studies, meaningful evaluation of outcomes occurs at 6–12 weeks after initiation of treatment, consistent with dermal remodeling timelines.
Clinical Evidence Supporting Polynucleotide Use
Periocular Wrinkles (Crow’s Feet)
One of the most frequently cited studies is a randomized, double-blind, split-face phase III trial comparing PN (Rejuran) with hyaluronic acid filler.
- Treatment interval: every 2 weeks
- Total sessions: 3
- Follow-up: 12 weeks
The study demonstrated:
- Significant improvement in skin quality
- Reduction in superficial wrinkle depth
- Favorable safety profile with no serious adverse events
This trial remains a cornerstone in establishing PN as a legitimate regenerative injectable in dermatology.
Long-chain PN and Skin Quality
Additional case series and observational studies report beneficial effects of long-chain PN on:
- Pore size
- Skin thickness
- Fine wrinkles
- Overall skin texture
Although sample sizes are limited, outcomes are consistently reported in a favorable direction, supporting the role of PN as skin quality modulators rather than volume-replacing agents.
VITARAN as a Polynucleotide-based Product
VITARAN is a PN-based injectable containing 20 mg/mL (2%) polynucleotides and carries CE certification.
Clinical data from manufacturer-supported studies using three-dimensional skin analysis tools demonstrate improvements in:
- Fine wrinkles
- Skin texture
- Pore appearance
- Overall skin quality
These effects have been particularly noted in the periocular region when administered at 2-week intervals for a total of 4 sessions.
Comparison: VITARAN and Earlier PN Formulations
Aspect | Earlier PN (e.g., Rejuran) | VITARAN |
Active substance | Polynucleotide | Polynucleotide |
Concept | Regenerative filler | Skin quality–focused PN |
RCT evidence | Phase III trial available | No head-to-head RCT |
Injection discomfort | Moderate in some patients | Clinically reported as less painful |
Product design | Long-chain PN | Newer PN formulation (2%) |
Regarding injection comfort, real-world clinical experience suggests that VITARAN is associated with less injection-related discomfort compared with earlier PN formulations in some patients.
This observation may be related to formulation characteristics, although randomized comparative studies are currently lacking.
Injection Technique and Clinical Application
From a procedural standpoint, PN are typically administered via:
- Intradermal or superficial dermal micro-injection techniques
- Small volumes per injection point
- Even distribution across the treatment area
The goal is skin regeneration and quality enhancement, not contouring or volumization
Expected Results and Clinical Timeline
- Day 1–3: Mild swelling, redness, or small papules at injection sites
- 1–2 weeks: Skin begins to feel firmer and smoother
- 4–8 weeks: Visible improvement in texture and skin tone
- 8–12 weeks: Optimal assessment of skin quality outcomes
Post-treatment Care
- Avoid heat exposure, sauna, and intense exercise for 24 hours
- Avoid rubbing or massaging treated areas
- Focus on skin barrier repair
- Consistent use of broad-spectrum sunscreen is essential
(FAQ)
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Conclusion
Polynucleotides represent a biologically grounded and clinically relevant class of regenerative injectables in dermatology.
VITARAN, as a newer PN-based product, fits well within modern strategies aimed at improving skin quality, resilience, and long-term health, rather than achieving immediate volumetric changes.
When used appropriately and guided by evidence-based principles, PN therapies offer meaningful value in contemporary dermatologic practice.
