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.
| Treatment Area | Typical Units |
|---|---|
| Full face | 6-12 months |
| Under-Eye (Rejuran I) | 6-12 months |
| Neck | 4-6 months |
| Acne Scars | 6-12 months |
Full Face
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.
Neck
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.
Lifestyle Habits
Sun exposure is one of the fastest ways to shorten Rejuran’s results. UV radiation degrades collagen and counteracts the skin repair that the polynucleotides are working to support. Smoking similarly works against your results. Research published in PubMed found that smokers showed 18 to 22% lower collagen synthesis rates compared to non-smokers, with tobacco smoke also triggering increased production of collagen-degrading enzymes in skin fibroblasts. Similarly, poor sleep, high stress, and dehydration also slow the regeneration process and can shorten the visible duration of your rejuran results.
Skincare Routine
Your daily skincare routine plays a more significant role than you expect. Using a broad-spectrum SPF 30 or higher every day protects the collagen that Rejuran helps build. Keeping your skin well-hydrated with a consistent moisturiser supports the treatment’s hydration benefits, while avoiding harsh active ingredients such as strong retinoids or exfoliating acids in the days immediately after treatment allows healing to proceed without unnecessary irritation.
Number of Sessions Completed
Rejuran longevity compounds with sessions. A person who completes 4 sessions will almost always see longer-lasting results than someone who stops after 2. The skin simply has more structural support to maintain when it has gone through a complete course.
Injector Skill and Technique
How Rejuran is injected affects how well the polynucleotides are distributed and absorbed. Precise placement in the superficial dermis, at the correct depth and spacing, ensures the PN reaches the right tissue layer to activate fibroblasts effectively. If the dosage is not distributed properly or if the depth is incorrect, it reduces both the quality and the longevity of results. This is why the experience and technique of your dermatologists matter.
How to Make Your Rejuran Results Last Longer
There are several practical things you can do to extend how long your Rejuran results hold.
Wear SPF Every Day
Sun protection is non-negotiable. UV exposure breaks down collagen continuously, which directly undermines what Rejuran is building. Using SPF every day, even on overcast days or when you are indoors near windows, is the single highest-impact habit for preserving your results.
Follow the Post-Treatment Window
In the first 24 to 48 hours after each session, avoid heat, strenuous exercise, alcohol, saunas, and direct sun exposure. These all increase blood circulation to the face in a way that can disperse the PN before it fully integrates into the dermis. After that initial recovery window, returning to your normal skincare routine is perfectly fine.
Support Your Skin From the Inside
Staying well-hydrated supports collagen production and also maintains the skin plumpness that Rejuran helps to build. Eat a diet with adequate protein and antioxidants so that your skin has the raw materials it needs to continue the repair work that Rejuran initiates.
Combine Treatments and Keep Up With Maintenance
Combining rejuran with complementary treatments can also extend and deepen the results. Rejuran works well alongside laser treatments, which stimulate surface-level renewal, as well as dermal fillers that add volume where Rejuran improves texture. Your doctor can advise on what combination makes sense for your specific skin goals. Sticking to your maintenance schedule, even when your skin looks good, prevents the gradual regression that happens when the PN stimulation is not periodically reinforced.
Get Long-Lasting Rejuran Results at Reberry Clinic
How long your Rejuran results last comes down to three things: completing the right number of sessions, having the treatment performed by an experienced dermatologist, and taking care of your skin between visits. Get all three right, and results hold close to a year for most patients. To ensure these factors are properly addressed, working with a qualified clinic is essential.
At Reberry Clinic, our board-certified dermatologists take the time to assess your skin condition and treatment goals before recommending a plan. Every course is built around your skin, not a standard package. We use only clinically validated Rejuran products and follow evidence-based treatment protocols from the initial course through to long-term maintenance.
If you are ready to find out whether Rejuran is the right treatment for your skin, contact us today to schedule a consultation.
Influencers with Reberry
Contact us today to schedule a consultation and take the first step toward revitalizing your face.
Dr. Baek
Frequently Asked Questions
Does Rejuran last the same for everyone?
No, Rejuran results vary based on age, skin condition, lifestyle, the number of sessions completed, and how consistently you follow aftercare. Younger patients with healthier skin and good post-treatment habits tend to see results lasting closer to 12 months, whereas older patients with significant skin concerns may see results fading sooner.
What happens when Rejuran wears off?
Your skin will gradually return toward its pre-treatment condition, but the baseline is often somewhat better than where you started, particularly after multiple completed courses. This is why regular maintenance is effective at preserving gains rather than starting from zero each time.
Can Rejuran be combined with other treatments to extend results?
Yes, Rejuran is regularly combined with laser treatments, Botox, and dermal fillers, each of which addresses a different aspect of skin aging. When used together under a doctor’s guidance, these treatments can complement each other and extend the visible results of each procedure.
How long does Rejuran Bumps last?
The small raised bumps that appear at injection sites after Rejuran are completely normal and temporary. They typically flatten within a few hours. In more sensitive areas like the under-eye, they may take up to 24 hours to fully settle.
