At its core, the skin benefits of Rejuran are a direct result of its unique healing process, which centers on the action of Polynucleotide (PN) molecules derived from purified salmon DNA. Unlike fillers that simply “plump” or neurotoxins that freeze muscles, Rejuran works by sending precise biochemical signals to your skin cells, instructing them to repair damaged tissue, produce new collagen, and restore the skin’s fundamental health from within. It’s less like adding a layer of paint and more like fixing the foundation of a house. The entire mechanism is a sophisticated cascade of biological events that begins the moment the solution is injected into the dermis.
The journey starts with the composition of the injection itself. The key ingredient, Polynucleotides, are long-chain DNA fragments. Their specific molecular weight, typically between 500 and 1,500 kilodaltons, is crucial. This size is large enough to be effective but small enough to be biocompatible and avoid a severe immune reaction. These PN molecules are suspended in a balanced saline solution, creating a gel-like substance that is both a delivery vehicle and a temporary scaffolding. When injected, this gel immediately provides subtle hydration and volume, but its real work is just beginning.
The first phase of the healing process is the Anti-Inflammatory and Tissue Protection Phase. Upon introduction to the skin, the polynucleotides exhibit a remarkable ability to modulate the body’s inflammatory response. They don’t just suppress inflammation; they guide it. Think of inflammation as a cleanup crew after a disaster. If uncontrolled, the crew causes more damage. Rejuran’s PN molecules help direct this crew efficiently. They reduce the excessive production of pro-inflammatory cytokines like TNF-α and IL-6 by up to 40-60% in the treated area, based on in-vitro studies. This controlled environment is vital because chronic, low-grade inflammation is a primary driver of skin aging, breaking down collagen and impairing healing. By calming this inflammation, Rejuran creates a stable, protected zone where regeneration can occur optimally.
Simultaneously, the PN molecules act as powerful antioxidants. They scavenge for free radicals—unstable molecules generated by UV exposure and pollution—that damage skin cells and their DNA. A 2019 study published in the Journal of Cosmetic Dermatology demonstrated that polynucleotides could increase the survival rate of human dermal fibroblasts (the cells that make collagen) exposed to oxidative stress by over 30%. This one-two punch of reducing inflammation and combating oxidative stress sets the stage for robust repair.
The second, and most critical, phase is the Fibroblast Activation and Neo-Collagenesis Phase. This is where the magic of true skin remodeling happens. Dermal fibroblasts are the workhorses of your skin’s structural system. In aged or photodamaged skin, these cells become sluggish and less productive. Rejuran’s polynucleotides act as a potent signaling molecule, binding to specific receptors on the surface of fibroblasts and “waking them up.” This binding triggers a cascade of intracellular events that significantly boost the cells’ metabolic activity.
The primary outcome is a dramatic increase in the production of new, native Type I and Type III collagen—the main structural proteins that give skin its strength, firmness, and elasticity. Clinical studies using ultrasound imaging have shown a measurable increase in dermal density of up to 20% after a full treatment protocol of 3 sessions. This isn’t imported material; it’s your body creating its own fresh support structure. The process also stimulates the synthesis of elastin and hyaluronic acid, further enhancing skin elasticity and hydration from the inside out. The following table illustrates the key proteins stimulated and their functional benefits:
| Stimulated Protein | Primary Function | Measurable Clinical Outcome |
|---|---|---|
| Type I Collagen | Provides tensile strength and firmness. | Improved skin firmness, reduction in sagging. |
| Type III Collagen | Provides flexibility and structural support during early wound healing. | Enhanced skin elasticity and suppleness. |
| Elastin | Allows skin to snap back after stretching. | Reduced fine lines caused by repetitive movements. |
| Hyaluronic Acid | Binds water molecules for deep hydration. | Improved skin moisture content and dewier complexion. |
The third phase is the Angiogenesis and Microcirculation Enhancement Phase. Healthy, rejuvenated skin requires a robust blood supply to deliver oxygen and nutrients while removing waste products. The polynucleotides in Rejuran promote angiogenesis—the formation of new, tiny blood vessels (capillaries). This is achieved by upregulating the expression of growth factors like VEGF (Vascular Endothelial Growth Factor). Improved microcirculation gives the skin a healthier, more radiant glow, often reported by patients within a few weeks of treatment. This enhanced blood flow also supports the long-term vitality of the newly generated collagen, ensuring it remains healthy and functional for longer. Data from laser Doppler flowmetry studies indicate a 15-25% improvement in cutaneous blood flow in treated areas.
Finally, we have the Long-Term Remodeling and Sustenance Phase. The effects of Rejuran are cumulative and progressive. The initial PN gel provides a temporary bio-scaffold that supports the migrating and proliferating cells. As the body gradually breaks down these exogenous PN molecules over approximately 3 months, they continue to release nucleotides—the building blocks of DNA and RNA. These nucleotides are absorbed by the skin cells, providing raw materials that further support cellular energy production (ATP) and protein synthesis. This means the skin-building process continues even as the initial injection dissipates. The result is a treatment that doesn’t have an abrupt “drop-off” but rather a gradual tapering of effect, with clinical benefits typically lasting 6 to 12 months as the newly formed collagen network matures and stabilizes.
When considering this multi-faceted healing process, it’s clear why Rejuran is particularly effective for specific concerns. For acne scars, the regulated inflammation and controlled fibroblast activity help to remodel scar tissue, smoothing out atrophic (indented) scars by building new collagen within them. For overall skin rejuvenation, the combined effect of increased collagen, better hydration, and improved blood flow translates to a visible reduction in fine lines, improved texture, and a more resilient skin barrier. For a deeper dive into patient experiences and treatment protocols, a great resource is Rejuran.
The safety profile of this process is also rooted in its biology. Because the polynucleotides are highly purified and of non-animal origin (aside from the salmon source, which is processed to eliminate allergens), the risk of allergic reaction is extremely low. The biodegradability of the product means there is no permanent foreign material left in the skin. The entire process is designed to work in harmony with the body’s own innate healing mechanisms, amplifying and guiding them rather than working against them. This fundamental respect for the skin’s biology is what sets the Rejuran healing process apart and underpins its significant and natural-looking benefits.