At its core, the Rejuran injection process is fundamentally different from other skin boosters because it uniquely utilizes polynucleotides (PN) derived from purified salmon DNA to stimulate the skin’s natural self-repair mechanisms at a cellular level, rather than just adding temporary hydration or volume. While many skin boosters like traditional hyaluronic acid (HA) fillers primarily act as a space-filler by binding water, Rejuran works by signaling fibroblasts—the skin’s repair cells—to produce more of your own collagen, elastin, and hyaluronic acid, leading to more sustainable improvements in skin quality, texture, and elasticity.
To truly understand this distinction, we need to dive into the science of what’s being injected. The active ingredient in Rejuran is Polynucleotide, a long-chain molecule made up of nucleotide units. These nucleotides are the building blocks of DNA and RNA. Sourced from sustainably farmed salmon, these PN molecules are highly purified to be biocompatible and non-immunogenic, meaning your body recognizes them as a friendly signal for repair, not as a foreign substance to attack. This is a stark contrast to the primary ingredient in most other skin boosters: Hyaluronic Acid. HA is a sugar molecule that’s fantastic at holding water—up to 1,000 times its own weight—providing immediate plumping and hydration. However, its effects are temporary because the body gradually breaks it down. The mechanism is different: HA is a hydrating agent, while PN is a regenerative signaling agent.
| Feature | Rejuran (Polynucleotide-based) | Traditional HA Skin Boosters (e.g., Restylane SkinBoosters®, Juvéderm Volite) |
|---|---|---|
| Primary Ingredient | Polynucleotides (Salmon DNA-derived) | Cross-linked or Non-cross-linked Hyaluronic Acid |
| Primary Mechanism | Cellular signaling for collagen/elastin/HA production (Regenerative) | Direct hydration and volume restoration by binding water (Hydrating/Filling) |
| Onset of Visible Results | Gradual improvement over 4-12 weeks as new collagen forms | Immediate plumping and hydration, peaks within days |
| Typical Longevity | 6 to 12 months (effects are cumulative with multiple sessions) | 3 to 6 months (HA is metabolized by the body) |
| Ideal For | Skin regeneration, improving elasticity, texture, fine lines, acne scars, and wound healing | Primarily improving hydration, radiance, and superficial plumping |
This difference in active ingredient dictates the entire treatment protocol. A typical rejuran treatment plan is not a one-and-done procedure. It’s designed as a series, often called a “course,” to maximize the regenerative effects. A standard initial course involves 3 to 4 sessions, each spaced approximately 4 weeks apart. This interval is scientifically chosen because it aligns with the skin’s natural turnover and collagen production cycle, which takes about 28 days. Each session builds upon the last, creating a cumulative effect where the skin’s foundation is progressively strengthened. In contrast, many HA skin booster treatments might also recommend an initial series (e.g., 3 sessions a month apart) for optimal hydration building, but a single session can still provide a noticeable, albeit temporary, result.
The injection technique itself also showcases key differences. Rejuran requires a very specific and technically demanding approach to be effective. Practitioners are trained to perform multiple, superficial intradermal injections, often using techniques like micro-droplet deposition or a series of tiny papules (small bumps) across the entire treatment area. This creates a “matrix” or a “scaffolding” of polynucleotides within the dermis, which acts as a direct signal to the fibroblasts residing there. The goal is to distribute the solution evenly and at the correct depth to trigger a widespread healing response. On the other hand, injection techniques for HA skin boosters can vary more widely. They can be injected as a series of micro-droplets (similar to Rejuran) or using a linear threading technique, fanning, or even a specialized micro-cannula. The technique is often adjusted based on the specific product’s viscosity and the patient’s concerns, but the primary goal is to distribute the HA evenly to maximize water-binding and hydration.
When we look at the results and longevity, the regenerative versus hydrating dichotomy becomes even clearer. Since Rejuran works by stimulating your body’s own collagen production, the results are not immediate. Patients typically see the first signs of improvement—like a subtle glow and improved hydration—within the first few weeks after the first session. However, the most significant results, such as improved skin elasticity, reduced pore size, and smoothing of fine lines and acne scars, develop gradually over 3 to 6 months as new collagen matures. This is why the treatment series is so important. The longevity of a full Rejuran course is generally longer, lasting 6 to 12 months, after which maintenance sessions are recommended once or twice a year. Because HA skin boosters provide direct hydration, their results are almost instantaneous. The skin looks plumper, dewier, and more radiant within days. However, as the body metabolizes the hyaluronic acid, these effects diminish. The results from a single session of an HA skin booster typically last 3 to 6 months, making it a more frequent maintenance treatment compared to the regenerative effects of Rejuran.
The safety and side effect profiles are also distinct, largely due to the biological nature of the substances. Rejuran’s polynucleotides are highly biocompatible. The most common side effects are temporary and localized to the injection site: redness, swelling, and those tiny papules or bumps that usually subside within 24 to 48 hours. Because it’s derived from DNA, the risk of allergic reaction is extremely low. Hyaluronic acid skin boosters are also considered very safe, as HA is a substance naturally found in the human body. Common side effects are similar: temporary redness, swelling, and bruising. A unique, though rare, risk associated with HA is the Tyndall effect—a bluish discoloration—if the product is injected too superficially. Both treatments have excellent safety profiles when performed by a qualified medical professional, but the biological signaling action of Rejuran means it’s generally very well-tolerated with minimal risk of adverse reactions.
Finally, the ideal candidate and target concerns highlight the practical applications of these differences. Rejuran is particularly powerful for individuals looking for skin regeneration and repair. It’s a top choice for treating acne scars, improving skin laxity and elasticity, refining enlarged pores, and healing damaged skin barriers. It’s often described as “rebuilding the foundation” of the skin. Traditional HA skin boosters are the gold standard for someone whose primary concern is dehydration and lack of radiance. They are fantastic for giving the skin a “drink of water,” reducing the appearance of fine lines caused by dryness, and achieving a healthy, dewy glow. In many cases, these treatments are not mutually exclusive; a skilled practitioner might even recommend a combination approach, using an HA booster for immediate hydration and Rejuran for long-term structural improvement, to address multiple concerns simultaneously.