Rejuran treatment fundamentally improves skin texture and elasticity by leveraging a unique form of polynucleotide (PN) technology. These PN molecules are derived from salmon DNA, purified to be biocompatible with human skin. When injected into the dermis, they act as a powerful signaling molecule and a hydrating scaffold. The core mechanism is twofold: first, the PN fragments attract moisture, creating a voluminous, hydrated environment that immediately plumps the skin. Second, and more importantly, they signal fibroblasts—the skin’s collagen-producing factories—to wake up and ramp up production of new collagen, elastin, and hyaluronic acid. This isn’t just a temporary filler effect; it’s a regenerative process that gradually restores the skin’s foundational support structure from within. Think of it as providing the blueprint and raw materials for your skin to repair itself, leading to smoother texture, tighter elasticity, and improved overall skin quality over time. For a deeper dive into the science behind this, you can explore the resources at Rejuran.
The Core Science: Polynucleotides as Cellular Messengers
To truly grasp how Rejuran works, we need to look closely at its active ingredient: polynucleotides. These are long-chain molecules made up of nucleotides, the building blocks of DNA. The PN used in Rejuran is sourced from salmon, but it’s highly purified to remove any proteins or allergens, leaving behind fragments that are remarkably similar in structure to human DNA fragments. This biocompatibility is key. When introduced into the skin, these fragments are not foreign invaders; instead, the body’s cells recognize them as “friendly” signaling molecules. Dermal fibroblasts have specific receptors that bind to these PN chains. This binding triggers a cascade of cellular activity known as fibroblast activation. A dormant fibroblast is like a sleeping factory. The PN molecules act as the wake-up call, switching on genes responsible for producing essential structural proteins. Studies have shown that PN can increase fibroblast proliferation and metabolic activity by significant margins. For instance, in-vitro studies published in dermatological journals have demonstrated a up to 30-40% increase in collagen synthesis in fibroblast cultures exposed to specific polynucleotide sequences compared to control groups. This is the bedrock of Rejuran’s efficacy—it doesn’t just add volume; it instructs your skin to rebuild itself.
Mechanism of Action: A Dual-Pronged Approach to Skin Rejuvenation
The improvement in skin texture and elasticity can be broken down into two simultaneous, synergistic actions: immediate hydration and long-term regeneration.
1. The Hydration and Scaffolding Effect: Polynucleotide molecules are hygroscopic, meaning they have a tremendous capacity to bind water. A single PN molecule can hold hundreds of times its weight in water. Upon injection, these molecules form a three-dimensional mesh or scaffold within the dermis. This mesh instantly attracts and retains moisture, leading to a visible plumping effect. This hydration directly improves skin texture by filling out fine lines and making the skin surface appear smoother and more radiant. It creates an optimal, aqueous environment for cells to thrive and function efficiently. This is often why patients notice an initial “glow” and improvement in skin quality within the first few weeks, even before significant new collagen is formed.
2. The Regenerative and Repair Stimulation: This is the long-game. The sustained presence of PN fragments provides continuous stimulation to fibroblasts. The activated fibroblasts begin synthesizing new Type I and Type III collagen, which provides tensile strength, and elastin, which gives skin its snap-back quality. Furthermore, they produce more of the skin’s own hyaluronic acid, enhancing natural moisture retention. This process is gradual. Collagen remodelling takes time—typically 3 to 6 months to see peak results. A clinical study following patients over 12 weeks reported measurable improvements using standardized scales. The data below illustrates the typical progression of improvement:
| Time Post-Treatment | Primary Improvement Mechanism | Observed Clinical Change |
|---|---|---|
| Weeks 1-4 | Intense hydration, scaffold formation, initial fibroblast activation. | Improved radiance, reduction in fine lines, skin feels plumper and smoother to the touch. |
| Months 1-3 | Active neocollagenesis (new collagen formation) and elastogenesis. | Measurable improvement in skin elasticity (using devices like a cutometer), pores appear smaller, skin texture becomes more refined. |
| Months 3-6+ | Collagen remodelling and maturation, sustained tissue repair. | Peak results visible: significant tightening, enhanced firmness, and a lasting improvement in overall skin density and resilience. |
Quantifiable Improvements: What the Data Shows
Beyond the biological mechanisms, the proof is in the clinical data. Assessments are often done using objective devices and subjective physician/patient scales. For elasticity, a tool called a cutometer measures the skin’s ability to deform and then return to its original state (a parameter called gross elasticity or R2). Research has shown that after a series of Rejuran treatments, patients can experience an average increase of 15-25% in skin elasticity measurements. For texture, analysis using high-resolution imaging (like Visia®) can quantify a reduction in skin roughness and the appearance of pores. One study found a reduction in average pore size by approximately 10-18% and a significant decrease in the depth of fine wrinkles. These aren’t just aesthetic claims; they are measurable, repeatable outcomes that validate the treatment’s regenerative premise.
Rejuran vs. Traditional Approaches: Filler and Energy Devices
It’s helpful to position Rejuran against other common treatments to understand its unique value. Hyaluronic acid (HA) fillers are excellent for replacing volume in specific areas like nasolabial folds or lips. They work by physically filling space. However, they do not fundamentally change the quality of the surrounding skin. Laser and radiofrequency (RF) treatments work by creating controlled micro-injuries to stimulate a wound-healing response, which includes collagen production. Rejuran differs because it is a bioactive stimulant rather than a physical filler or an ablative/damaging energy source. It’s often considered a “skin booster” because it improves the overall health and quality of the skin canvas. Many practitioners combine these modalities for a comprehensive approach—using Rejuran to improve global skin quality and HA fillers or energy devices to address more specific, localized concerns.
Application and Treatment Protocol for Optimal Results
Rejuran is not a one-and-done treatment. Because it works by stimulating the body’s natural regenerative processes, which operate on a biological timeline, a series of sessions is recommended to achieve cumulative and lasting results. The standard protocol often involves 3 initial sessions, spaced 4 weeks apart. This priming phase ensures a consistent level of PN in the skin to continuously stimulate fibroblasts. After this initial series, the results are typically maintained with periodic touch-up treatments, often every 6 to 12 months, depending on the individual’s age, skin condition, and metabolic rate. The treatment itself involves multiple micro-injections across the entire face, often in a mesotherapy technique, ensuring even distribution of the product in the dermal layer. The procedure is relatively quick, with minimal downtime—some redness, swelling, or tiny bumps that usually resolve within 24-48 hours.
The Biological Foundation: Why Skin Loses Texture and Elasticity in the First Place
Understanding the problem is crucial to appreciating the solution. The degradation of skin texture and elasticity is primarily due to the natural aging process called “chronoaging” and external factors like UV exposure (“photoaging”). Both processes lead to a decline in fibroblast activity. As we age, fibroblasts become sluggish and produce less and lower-quality collagen and elastin. Simultaneously, enzymes called matrix metalloproteinases (MMPs) break down the existing collagen matrix. This double whammy—decreased production and increased degradation—results in a thinner, weaker dermal structure. The skin loses its ability to hold moisture, leading to dryness and rough texture. The loss of the elastic network means skin doesn’t snap back as easily, leading to sagging. Rejuran’s PN technology directly counteracts this by re-energizing the fibroblasts, tipping the balance back in favor of production and repair, thereby addressing the root cause of the issue rather than just masking the symptoms.