Generally, the visible results from a single Rejuran treatment session can last anywhere from 6 to 12 months. However, this timeframe isn’t a one-size-fits-all guarantee; it’s a dynamic outcome shaped by a complex interplay of factors including the specific Rejuran product used, your skin’s unique biology, your age, lifestyle habits, and the technical skill of your practitioner. Unlike hyaluronic acid fillers that simply add volume, Rejuran works by stimulating your skin’s own regenerative processes, which means the “duration” of effect is more about the longevity of the skin repair cycle it initiates.
The core of Rejuran’s action lies in its active ingredient: Polynucleotide (PN). PN are fragments of DNA extracted from salmon sperm, purified to be biocompatible and safe for human use. These fragments act as signaling molecules when injected into the dermis. They don’t just sit there; they actively recruit fibroblasts—your skin’s collagen-producing factories—and enhance their activity. Think of PN as a supervisor showing up at a construction site (your skin), motivating the workers (fibroblasts) to not only produce more building materials (collagen and elastin) but also to do a better, more organized job of it. This process of neocollagenesis (new collagen formation) is not instantaneous. It takes time for the skin to rebuild its foundation, which is why the most significant improvements are often seen a few months after treatment and why the results are inherently more long-lasting than superficial plumping agents.
To understand the duration, it’s crucial to look at the different Rejuran formulations, as they are designed for different depths and purposes, which directly influences how long their effects persist.
| Rejuran Product | Primary Target & Depth | Typical Protocol | Expected Duration of Visible Results |
|---|---|---|---|
| Rejuran I | Superficial dermis; fine lines, texture, overall rejuvenation. | Often used in a series of 3 sessions, 4 weeks apart. | 6-9 months. Best results are cumulative after the initial series. |
| Rejuran Healer | Mid to deep dermis; scar improvement (acne, post-surgical), wound healing. | Varies based on scar severity; typically 3-5 sessions. | Can be 12 months or longer, as scar remodeling is a permanent structural change. |
| Rejuran HB | Deep dermis; volumizing, deep wrinkles, skin laxity. | Often 1-2 sessions for initial correction. | 9-12 months due to its thicker viscosity and deeper placement. |
As the table illustrates, a treatment plan for acne scars with Rejuran Healer is investing in a more profound structural change, and thus the results can extend beyond a year. In contrast, Rejuran I for general skin brightening and fine lines might require more frequent touch-ups. A key data point comes from clinical studies. For instance, research published in the Journal of Cosmetic Dermatology on PN for skin rejuvenation showed a statistically significant improvement in skin elasticity, hydration, and wrinkle depth that was maintained at the 6-month follow-up mark after a treatment series. Another study focusing on acne scar treatment demonstrated continued improvement even at the 12-week post-treatment evaluation, suggesting the regenerative process was still ongoing.
Your personal profile is perhaps the most significant variable. A 30-year-old with minimal sun damage who gets Rejuran for preventative maintenance will likely see results last longer than a 60-year-old with significant photoaging. Why? Because the younger individual’s fibroblast population is more robust and responsive. The natural aging process, characterized by a gradual decline in fibroblast activity and collagen production (we lose about 1% of collagen per year after our mid-20s), means that older skin requires more “convincing” and the results may fade slightly faster as baseline collagen loss continues. Furthermore, lifestyle choices have a massive impact. Sun exposure is public enemy number one for collagen. UV rays break down collagen fibers, directly counteracting the benefits of your Rejuran treatment. A patient who is scrupulous about daily, high-SPF sunscreen use will protect their investment far better than someone who is not. Similarly, smoking, high sugar consumption, and chronic stress all accelerate collagen degradation through inflammatory pathways, effectively shortening the duration of your results.
The technique and experience of the injector cannot be overstated. A skilled practitioner doesn’t just inject the solution; they create a strategic pattern of micro-deposits at the correct depth to maximize fibroblast activation and ensure even skin regeneration. Improper technique—injecting too superficially or too deeply—can lead to suboptimal results, uneven texture, or a drastically reduced longevity of effect. The number of sessions you undergo initially also plays a role. Most practitioners recommend a series of 2 to 3 treatments, spaced about a month apart, to achieve a cumulative effect. This “priming” process fully activates the skin’s regenerative machinery. A single session might offer a subtle boost lasting 3-4 months, but the full series is designed to build a foundation that lasts the full 6-12 months. After this initial series, maintenance sessions are typically recommended. The interval for these touch-ups varies widely; some patients may only need a session once a year, while others, depending on their aging rate and goals, might prefer a top-up every 9 months.
It’s also helpful to compare Rejuran’s longevity to other common procedures. Hyaluronic acid fillers for wrinkles, like Juvederm or Restylane, typically last 6-18 months, but they work by filling space, not by regenerating tissue. Once the gel is metabolized, the effect is gone. Procedures like laser resurfacing (e.g., Fraxel) or radiofrequency microneedling (e.g., Morpheus8) also stimulate collagen, and their results can last 1-2 years or more, but they are generally more invasive, have longer downtime, and a higher cost per session. Rejuran occupies a unique middle ground: less downtime than energy-based devices, with a more regenerative and longer-lasting mechanism than standard fillers.
Ultimately, the question of duration is best answered through a detailed consultation with a qualified medical professional. They can assess your skin’s condition, discuss your goals, and recommend a personalized treatment plan—including which Rejuran variant is right for you and a projected timeline for maintenance—that will give you the most value and the longest-lasting, healthiest-looking skin possible. The journey with Rejuran is one of patience and consistency, rewarding you not with a temporary filler but with genuinely revitalized skin from within.