At its core, the polynucleotide (PN) technology in Rejuran works by delivering fragmented chains of DNA nucleotides directly into the dermis. These PN molecules act as signaling agents and building blocks, fundamentally stimulating the skin’s own regenerative processes to repair damaged tissue, boost collagen production, and restore hydration. Think of them as a set of precise instructions that tell your skin’s fibroblasts—the cells responsible for making collagen and elastin—to wake up and get back to work. This isn’t about adding a foreign substance; it’s about empowering your skin to heal itself from within.
The magic lies in the specific structure of these polynucleotides. They are derived from highly purified salmon DNA, which shares a remarkable similarity to human DNA, minimizing the risk of allergic reactions. The fragments are a specific length, optimized for bioavailability and biological activity. Once injected, they integrate into the skin’s extracellular matrix, creating a supportive scaffold. This scaffold does two critical things: it provides immediate hydration by binding water molecules, and it sends out sustained signals for cellular repair. A rejuran study published in the Journal of Cosmetic Dermatology observed a significant increase in skin density and elasticity over a 12-week period following PN treatment, with objective measurements showing improvements of up to 30% in some parameters.
Let’s break down the primary benefits from a cellular and clinical perspective.
Cellular Regeneration and Fibroblast Activation
The most profound effect of PN technology is on fibroblast activity. As we age, environmental damage like UV exposure (photoaging) and the natural aging process cause fibroblasts to become sluggish and less productive. They produce lower-quality, disorganized collagen, leading to wrinkles, thinning skin, and loss of firmness. Rejuran’s PN fragments directly target this issue. They bind to specific receptors on the surface of fibroblasts, effectively “switching them on.” This activation triggers a cascade of events:
- Proliferation: The number of active fibroblasts increases.
- Collagen Synthesis: Activated fibroblasts ramp up production of Type I and Type III collagen, the main structural proteins that give skin its strength and plumpness.
- Elastin Production: The production of elastin, which provides snap-back elasticity, is also enhanced.
This isn’t a temporary plumping effect. It’s a long-term restructuring of the skin’s foundation. Histological studies (examinations of skin tissue samples) have visually confirmed a thickening of the dermal layer and a more organized, denser collagen network after a series of PN treatments. The data below illustrates the typical timeline of this regenerative process.
| Time Post-Treatment | Cellular & Clinical Changes | Supporting Data / Measurement |
|---|---|---|
| 0-4 Weeks | Initial hydration and scaffold formation. Early fibroblast activation begins. | Up to 40% improvement in skin hydration measured by corneometer. Patients report improved texture and “glow.” |
| 4-12 Weeks | Peak collagen and elastin synthesis. Remodeling of the extracellular matrix. | Up to 25-30% increase in skin elasticity measured by cutometer. Visible reduction in fine lines and pore size. |
| 12+ Weeks | Maturation of new collagen fibers, leading to sustained improvements in density and firmness. | Dermal density shown to increase by an average of 15% via ultrasound imaging. Results are long-lasting. |
Powerful Anti-Inflammatory and Wound Healing Properties
Beyond building new collagen, PN technology is a powerful modulator of inflammation. This is a key differentiator from many other skin treatments. Inflammatory processes are at the root of many skin concerns, from acne and rosacea to general sensitivity and the lingering redness from past breakouts. The polynucleotides in Rejuran have been shown to:
- Reduce pro-inflammatory cytokines, which are signaling molecules that drive inflammation.
- Promote the activity of anti-inflammatory cytokines, helping to calm the skin.
- Accelerate the wound healing process by encouraging the migration of cells needed for repair.
This makes Rejuran an excellent treatment for repairing damaged skin barrier function and addressing conditions like acne scars. By calming the inflammatory environment, the skin can focus its energy on regeneration rather than defense. For patients with post-acne erythema (red marks) or rolling scars, the anti-inflammatory action, combined with the collagen-building effect, leads to smoother, more even-toned skin. Clinical observations note a significant improvement in the overall homogeneity and redness of the skin, often after just one treatment session.
Superior Hydration and Bio-revitalization
While many injectables focus solely on adding volume or freezing muscles, Rejuran’s approach is one of bio-revitalization—revitalizing the skin’s biology. A major component of this is deep, lasting hydration. The PN molecules are highly hygroscopic, meaning they have a tremendous capacity to attract and bind water. Each molecule can hold many times its weight in water, creating a reservoir of moisture within the dermis.
This is fundamentally different from applying a topical moisturizer, which primarily affects the surface layer of the skin. The hydration from Rejuran comes from within the skin’s structure, leading to a lasting improvement in skin quality. This deep hydration helps to plump up skin cells, making fine lines less noticeable and giving the complexion a dewy, radiant appearance. The combination of renewed structural proteins and optimal hydration levels is what creates the signature “Rejuran glow”—a look of health that comes from truly improved skin function.
The mechanism is synergistic. The hydrated scaffold created by the PN fragments provides the ideal environment for fibroblasts to thrive and produce collagen efficiently. In turn, the newly formed collagen network helps to retain this moisture more effectively, creating a positive feedback loop for skin health. Patient satisfaction surveys consistently highlight improvements in radiance, smoothness, and hydration as some of the most valued outcomes, often reported as early as two to three weeks after the initial treatment.