5 Rejuran Effects and Their Duration?
- Is it over after 3 treatments? The real difference wasn't in the number of treatments, but in the first 4 weeks of management.
- Collagen synthesis lasts for 6 months, but the time it takes to feel the effects varies from person to person, between 2-8 weeks.
- Not many people know that the speed of results differs for under-eye concerns, pores, and scars.
Information as of October 2026
A Dermatologist's Perspective on Reality
- 18% increase in dermal collagen density
- Duration: 6-9 months
- Average of 4 weeks to perceive effects
Everyone Counts Sessions, But the Real Key is Elsewhere
You've probably heard that getting three sessions of Rejuran improves your skin.
However, even with the same three sessions, some people see a difference in skin texture within two weeks, while others wonder 'Is this it?' after two months. The difference wasn't in the number of sessions.
The core of Rejuran's effectiveness lies in PN (Polynucleotide) stimulating fibroblasts in the dermis to create new collagen.
This process doesn't begin immediately after the injection but starts in earnest from week 4, and the results can vary significantly depending on the skin's environment during this period.
Five Rejuran Effects, Each with a Different Onset Speed
1) Improved skin texture comes first. That moment around weeks 2-3 when you think, 'My makeup is applying better?' is this effect.
2) Pore reduction takes 4-6 weeks. It works by the pore walls tightening as collagen fills in, which requires more time.
3) Increased elasticity is felt around weeks 6-8, as the dermal layer needs to actually thicken.
4) Scar and pigment improvement becomes noticeable after 8 weeks. To expect results this far, you need at least three sessions.
5) Fine lines under the eyes are noticeable from week 4 with Rejuran Eyes, but its concentration is lower than regular Rejuran, so the duration is also shorter.
Advertisements claim 'everything improves at once,' but in reality, the timing for each effect is distinct.
OX Quiz
Skin improves immediately after Rejuran injection.
Check the answer
X PN begins collagen synthesis from week 4 post-injection. What appears as an immediate effect is the temporary volume from the injected solution; true regenerative effects are perceived a month later.
Duration: How Much Can We Honestly Trust It?
6-9 months is the official answer (Korean Dermatological Association, 2022). However, there's a catch.
Rejuran acts as a switch to initiate collagen synthesis; the injected PN itself doesn't remain for six months.
PN is degraded within 4 weeks of injection, and after that, the collagen your skin has created sustains the results.
Therefore, the first 4 weeks of post-care are crucial. If you repeatedly expose your skin to excessive UV rays, alcohol, or lack of sleep during this period, your collagen synthesis rate will significantly drop.
Conversely, if you diligently focus on hydration and sun protection, the effects often last an additional 2-3 months. This is a part that advertisements don't mention.
Caution Laser treatments (IPL, Fraxel, etc.) within a week of Rejuran can amplify inflammatory responses and halve the effectiveness. Maintain at least a 2-week interval.
Realistic Expectations: This is Success
It's more accurate to view Rejuran as a 'floor raiser' rather than a 'dramatic transformation'. Pores won't halve in size, nor will nasolabial folds disappear.
Instead, the feeling that your bare face looks less tired than before is the real outcome of Rejuran. This is why dermatologists describe it as 'natural regeneration'.
Based on completion of 3 sessions, clinical reports show an average increase in skin thickness of 0.2mm (ultrasound measurement) and a 18% rise in collagen density.
While these numbers may seem small, when they accumulate, it reaches a level where you might use a foundation one shade lighter. This is considered a success.
- After 3 sessions: 18% increase in collagen density, 0.2mm increase in skin thickness
- Post-care during the first 4 weeks can result in a 2-3 month difference in duration
Is Rejuran Right for My Skin?
If you're concerned about both pores and elasticity
Combination of 3 sessions of regular Rejuran + 1 session of Rejuran Healer (high concentration)
If you want to focus solely on fine lines under the eyes
4 sessions of Rejuran Eyes alone; however, the duration is shorter than regular Rejuran
Avoid These After Rejuran Treatment
- Exposure to saunas or high-temperature environments for 3 days post-procedure → Amplifies inflammatory response
- Alcohol consumption within a week → Accelerates PN degradation, reducing effectiveness
- Other laser treatments within 4 weeks → Interferes with collagen synthesis
Frequently Asked Questions
Are 3 sessions necessary for results?
While you might notice improved skin texture after just one session, at least three sessions are needed to expect improvements in pores, elasticity, and scars.
What are the side effects?
Swelling, bruising, and small papules at the injection site may occur for 2-3 days. Rarely, allergic reactions (rash, itching) have been reported, requiring immediate medical attention.
If the effects wear off, do I need another session right away?
Collagen doesn't completely disappear even after 6 months. One maintenance session every 9-12 months is sufficient.
References
- Study on the Skin Regeneration Effects and Duration of Polynucleotides — Korean Dermatological Association, 2022
- Clinical Data on Collagen Synthesis Timeline After PN Injection — Journal of Cosmetic Dermatology, 2021
Lumi's Take
Rejuran isn't a 'get it done and forget it' treatment; the real start is the 4 weeks after the procedure. How well you care for your skin during that period will change how you look in the mirror six months later. Don't be greedy; watch your skin slowly replenish itself.
This content is for informational purposes only and does not substitute for medical advice. Always consult with a specialist before undergoing any procedure.
