If you are considering Rejuran, you have probably come across claims that it gives long-lasting skin renewal, but without a clear number attached to it. Most people expect Rejuran to last the same for everyone, but the duration of Rejuran varies from person to person and from one treatment stage to the next.
Rejuran is not a treatment that gives you instant, fixed results like a filler. It works by triggering your skin’s own repair processes, which means results build gradually and last differently depending on where you are in your treatment plan. After one session, you may see early improvements in hydration and texture. After a completed course, those improvements run deeper and hold for much longer.
In this blog, we will walk you through how long Rejuran typically lasts, how a full course differs from a single session, what shortens or extends your results, and how to get long-lasting results.
What Is Rejuran?
Rejuran is a skin rejuvenation injectable made from polynucleotides(PN), which are DNA fragments extracted and purified from salmon. The salmon DNA used in Rejuran shares a high degree of biocompatibility with human DNA, which is why the skin absorbs it well and responds to it without significant adverse reactions.
When injected into the dermis, polynucleotides stimulate fibroblast activity, which is the cellular process responsible for producing collagen and elastin. Rather than adding volume the way a filler does, Rejuran works at a structural level. It improves skin thickness, elasticity, hydration, and texture from the inside. According to a study published by Dermatologic Therapy, patients who completed a series of polynucleotide injections showed measurable improvements in pore size, skin thickness, skin tone, and elasticity, with results appearing more pronounced over subsequent sessions. Over time, this translates into skin that not only looks healthier on the surface, but also functions better; more resilient, better hydrated, and able to recover more effectively from everyday damage.
How Long Does Rejuran Typically Last?
For most people who complete a full initial course, Rejuran results last between 6 and 12 months. That range exists because duration is influenced by multiple factors such as skin laxity, metabolism, age, & more. Someone in their 30s with well-hydrated skin and consistent sun protection will naturally hold results longer than someone older with more significant baseline damage or habits that accelerate skin ageing. Rather than a fixed number, think of it as a result that your skin health and aftercare either widen or narrow.
You should also understand that the results of Rejuran healer do not disappear suddenly, as the collagen stimulation process continues even after your final session. The peak of visible results is usually reached between 1 and 3 months after completing the course. After that, results hold for several months before your skin slowly begins returning to its pre-treatment baseline.
A single session, on the other hand, produces more limited longevity. The effects from one injection can be visible within 1 to 2 weeks, but they typically last around 2 to 4 months before fading. This is because one session does not provide enough repeated stimulation to fully activate and sustain the collagen remodelling cycle. The skin improves, but the structural foundation is not yet stable enough to hold those results long-term.
How Long Does Rejuran Last for Different Treatment Areas?
Where you get Rejuran injected affects how long your results will last. Each area has different skin thickness, movement patterns, and baseline conditions, and all of those factors influence how well your skin holds onto the improvements over time.
Rejuran is commonly used for full face treatment. It targets your overall skin quality across the face, including texture, hydration, pore size, and fine lines. After completing a full treatment, most people see results that last between 6 and 12 months.
Under-Eye Area
The skin under your eyes is the thinnest skin on your face, which makes it both one of the most delicate areas to treat and one of the most visibly responsive. A specific variant called Rejuran I is used here. It has a lower viscosity than the standard formula, allowing it to integrate more gently into such fine, sensitive tissue. It addresses dark circles, fine lines, and the crepey texture that tends to develop with age. After a completed course, results here typically last 6 to 12 months.
The neck is an area that more people are treating with Rejuran now, particularly for laxity, fine horizontal lines, and crepey texture. Your neck skin has fewer oil glands than your face, which means it loses moisture faster and tends to show aging sooner. For this reason, rejuran results in the neck generally last around 4 to 6 months after a full course, shorter than the face.
Acne Scars
Treating acne scars with Rejuran works differently from general skin rejuvenation. Scar tissue is denser and more resistant to change, so results take longer to develop and typically require more sessions to become visible. Most people targeting acne scars need at least 4 sessions before seeing meaningful improvement, with changes building gradually over 3 to 6 months post-course. A study published in the Journal of Dermatological Treatment found that polynucleotide-based therapy using Rejuran produced notable improvements in scar appearance, texture, and overall skin quality across a series of patient case studies. Once results are established, they can last 6 to 12 months with proper maintenance.
Does One Session Last as Long as a Full Course?
No, and this is one of the most important things to understand before starting Rejuran treatment. A full initial course typically involves 3 to 4 sessions, spaced 3 to 4 weeks apart, where each session builds on the previous one. The first session begins stimulating fibroblast activity, and the second reinforces it. By the third and fourth, your skin’s regenerative capacity is significantly more active, and the structural improvements run deeper. This cumulative effect is what gives you results that hold for 6 to 12 months, rather than fading within a few months as they would after a single treatment.
How Often Should You Get Rejuran?
This depends on where you are in your treatment plan. For most people, treatment is structured in two phases.
Initial Course
The initial course consists of 3 to 4 sessions, each spaced 3 to 4 weeks apart. This interval gives your skin enough time to process each round of polynucleotide stimulation before the next session reinforces it. Rushing sessions closer together does not speed up results, as your skin needs that recovery window to complete each cycle of collagen remodelling. Spacing them too far apart, on the other hand, reduces the cumulative benefit. The 3 to 4 week window is clinically optimized for consistent collagen building.
Maintenance Sessions
Once your initial course is complete, maintenance is typically recommended every 6 to 12 months. If your skin is in good condition and you are consistent with aftercare, twice a year is usually sufficient to preserve the improvements you have made. If you are treating more complex concerns like acne scarring or significant skin laxity, your doctor may recommend slightly more frequent check-ins in the first year.
What Factors Affect How Long Rejuran Lasts?
Rejuran does not last the same amount of time for every person. Several factors determine whether your results hold closer to 6 months or extend toward 12.
Age and Skin Condition
As you get older, your skin’s natural regenerative capacity slows down. Fibroblast activity decreases with age, which means the skin requires more input to produce the same collagen response. A person in their early 30s with mild skin concerns will typically see longer-lasting rejuran results than someone in their late 40s or 50s treating more significant skin aging. This is not a reason to avoid treatment at any age; it is simply a realistic factor that helps to set the right expectations.