Across aesthetic clinics from Seoul to Singapore to Los Angeles, one treatment keeps appearing at the top of skin rejuvenation conversations: the Rejuran injection. Not a filler. Not a standard hydration booster. Something fundamentally different — a PDRN injection that works at a cellular level to heal, repair, and regenerate the dermis from within, producing improvements in skin quality that build progressively and last well beyond what most other skin booster shots can offer.
If you’ve been researching anti-aging solutions and keep circling back to Rejuran, this guide gives you the full picture. We’ll cover exactly what a Rejuran injection is, how PDRN injection therapy works in the skin, what results are realistic, which formula suits your skin type, and everything you need to know before your first appointment.
What Is a Rejuran Injection?
A Rejuran injection is a dermal rejuvenation procedure that delivers polynucleotides (PN) — also known as polydeoxyribonucleotides (PDRN) — directly into the dermis through a series of fine micro-injections. The PN molecules used in Rejuran are extracted from wild salmon DNA and purified using PharmaResearch’s patented DOT™ (DNA Optimising Technology), which removes all proteins and allergens while preserving only the bioactive DNA fragments the skin can utilise.
Salmon DNA is used for a specific, well-documented reason: it shares approximately 97% genetic similarity with human DNA. This extraordinary degree of biological compatibility allows the purified polynucleotides to integrate with human skin cells seamlessly, triggering regenerative processes without provoking immune rejection.
The result is a skin booster shot that does something most injectables don’t — it genuinely repairs and regenerates the skin’s internal environment rather than simply filling a space or providing temporary hydration.
How Does a Rejuran Injection Work? The Science Behind PDRN Injection Therapy
To understand why Rejuran injections produce the results they do, it’s worth understanding what polynucleotides actually do inside the skin. This isn’t marketing — it’s documented regenerative biology.
Activating the Skin’s Repair Machinery
When PN molecules are injected into the dermis, they bind to adenosine A2A receptors in skin cells. This triggers a biological cascade that activates fibroblasts — the cells responsible for producing collagen, elastin, and the extracellular matrix that gives skin its structure. The result is a genuine collagen boost that comes from your skin’s own production rather than from an external substance filling space.
Reducing Inflammation at the Source
Chronic low-grade inflammation is one of the main drivers of skin ageing. Rejuran’s PN molecules have well-documented anti-inflammatory properties, reducing pro-inflammatory cytokines and calming the dermal environment. This makes Rejuran particularly effective for sensitised, reactive, or post-acne skin — conditions where inflammation has compromised the skin barrier over time.
DNA Repair in Damaged Skin Cells
Polynucleotides provide the building blocks (nucleotides) that skin cells need to repair their own DNA. For photoaged skin — where UV exposure has damaged cellular DNA — this has meaningful implications. Rejuran addresses sun damage at the foundational cellular level, not just at the visible surface.
Strengthening the Skin Barrier
By supporting cellular regeneration and rebuilding the extracellular matrix, Rejuran injections progressively strengthen the skin’s protective barrier. Skin retains moisture better, reacts less to environmental stressors, and maintains a more balanced oil-to-water ratio. For patients whose skin has become reactive or easily irritated — often a consequence of years of harsh treatments or sun exposure — this barrier restoration is often one of the most impactful benefits they notice.
What Conditions Does Rejuran Injection Treat?
Unlike many aesthetic treatments that target one specific concern, a Rejuran injection addresses multiple aspects of skin health simultaneously. This is a key reason it has become so popular as a foundational treatment in Korean aesthetic medicine — it improves the overall condition of the skin rather than correcting individual symptoms in isolation.
Rejuran injections are effective for:
- 🌿 Fine lines and early wrinkles — particularly superficial lines that reflect loss of dermal density rather than deep muscle activity
- 🌿 Skin texture irregularities — rough patches, uneven surface, crepiness
- 🌿 Enlarged pores — as new collagen supports pore walls, visible pore size reduces over the treatment course
- 🌿 Dull, fatigued skin — the radiance improvement is one of the most consistently reported early results
- 🌿 Acne-damaged skin — reduces post-inflammatory redness and helps repair shallow scarring
- 🌿 Sun-damaged or photoaged skin — addresses UV damage at the cellular DNA level
- 🌿 Sensitised or reactive skin — the anti-inflammatory action makes Rejuran particularly effective here
- 🌿 Loss of skin elasticity — improvement in firmness and bounce is measurable after a full treatment course
- 🌿 Post-treatment recovery — widely used after laser resurfacing, chemical peels, and microneedling to accelerate healing
What Rejuran injection does not do is add volume or change facial structure. It is a skin quality treatment, not a structural one. Patients who understand this distinction — and who are seeking skin that looks genuinely healthier rather than dramatically different — are consistently among the most satisfied with their results.
The Rejuran Injection Range: Which Formula Is Right for You?
Rejuran is not a single product — it’s a family of formulations, each engineered for a specific skin layer or patient concern. Knowing which type you need shapes everything about your treatment plan.
Rejuran Healer — The Classic PDRN Injection
The original formulation. Contains high-purity PN in a medium-viscosity gel, suitable for full-face and neck treatment. The most versatile option — effective across all skin types from the mid-20s onwards for general skin health, barrier repair, fine line reduction, and overall dermal rejuvenation.
Rejuran I — For the Eye Area
A lower-viscosity version of the standard formula, specifically designed for the delicate periorbital zone. Safely injected into thin under-eye skin and crow’s feet area without causing lumps or heaviness. Clinical studies showed improvement in periorbital wrinkles in 94% of patients after four sessions. If the eye area is your primary concern, this is the right injection. Detailed results from this treatment are documented in Rejuran Under Eye Results: What to Expect Before and After Treatment.
Rejuran HB — Healing Plus Deep Hydration
Combines PN with high-molecular-weight hyaluronic acid (HA) and lidocaine. The HA provides immediate skin hydration and visible glow; lidocaine reduces injection discomfort by approximately 53% compared to the standard Healer. Best for dry, dehydrated skin or patients who are new to injectables and want both comfort and earlier visible results.
Rejuran Black — Premium Anti-Aging Formula
The premium tier, featuring highly purified next-generation PDRN combined with antioxidants and peptides. Addresses both the collagen-stimulation and oxidative components of skin ageing. Best for patients in their 40s and 50s with established photoageing, pigmentation concerns, or anyone seeking maximum regenerative impact.
Rejuran TrueSkin — High-Concentration Next-Generation PDRN
Contains 2% PN concentration — higher than the standard Healer — combined with HA and amino acids. Clinical studies show measurable improvements in hydration and elasticity, with superior performance to HA fillers in wrinkle and texture improvement. Best for acne-scarred skin, intensive anti-aging, or young patients pursuing aggressive preventive care.
What Happens During a Rejuran Injection Session?
Understanding the treatment process helps manage expectations and reduces pre-appointment anxiety. Here’s a step-by-step overview of a typical Rejuran injection session.
Preparation (20–30 minutes before)
A topical anaesthetic cream is applied to the face and left for 20–30 minutes. For Rejuran HB, which contains lidocaine in the formula itself, this significantly reduces discomfort before the injections begin. Avoid blood-thinning supplements including aspirin, ibuprofen, fish oil, and vitamin E for at least one week before your session to minimise bruising.
The Injection (20–30 minutes)
Using a fine needle (typically 27G–33G depending on the area and practitioner preference), Rejuran is delivered through a series of precise micro-injections into the superficial dermis. The technique varies by practitioner — serial puncture (individual dots across the face), linear threading, or a combination — but the goal is consistent: even distribution of PN molecules across the treatment zone.
Immediately after injection, small papules (bumps) appear at injection sites. This is expected, not alarming — they indicate the product has been correctly placed in the dermis and typically flatten within a few hours to 24 hours.
Immediately After the Session
Mild redness, minor swelling, and occasional small bruises are the most common post-treatment findings. Most patients return to their normal schedule the same day or the following morning. Avoid saunas, intense exercise, alcohol, and direct sun exposure for 48–72 hours. Gentle cleansing and adequate moisturising are recommended for the first few days.
Rejuran Injection Results: What to Realistically Expect and When
One of the most important things to understand about Rejuran injection results is their timeline. This is not an instant-gratification treatment. The improvement is biological and cumulative, building as your skin’s own collagen production responds to the PN stimulation.
Days 1–3
Mild redness, small bumps at injection sites, occasional swelling. Some patients notice the skin already feels subtly more hydrated. This phase is simply post-injection recovery — there’s nothing dramatic happening visibly yet.
Week 1–2
Injection marks resolve. Skin starts to feel calmer and more even-textured. For Rejuran HB patients, the HA component has already been providing hydration improvement since the day of treatment.
Week 3–6
Noticeable improvements in skin quality become visible. Texture smoother, pores appear smaller, skin tone more even. Collagen stimulation from the PN is well underway. Many patients describe their skin as looking “rested” or “healthier” rather than looking “done.”
Month 2–3 (after a full course)
Full collagen remodelling results are visible. Firmness, elasticity, radiance, and pore refinement all at their peak. This is when most patients describe being the most satisfied with what they see. Results from a complete 3–4 session course typically last 6–12 months before maintenance is recommended.
For a comprehensive look at the full range of Rejuran products and how each one performs across the timeline, Rejuran: Your Complete Guide to Korea’s Most Trusted Skin Rejuvenation Range is the most thorough resource available.
How Does Rejuran Injection Compare to Other Anti-Aging Solutions?
Rejuran vs HA Skin Boosters
Standard hyaluronic acid skin boosters (Profhilo, Restylane Skinboosters) hydrate the dermis and plump the skin temporarily. They don’t repair damaged skin cells or stimulate biological collagen production. Rejuran injection produces more durable results because it triggers genuine dermal regeneration — not just temporary hydration. For patients who want real improvement in skin quality rather than a recurring hydration top-up, Rejuran consistently delivers more meaningful outcomes.
Rejuran vs Traditional Fillers
Fillers add immediate mechanical volume. Rejuran adds no volume whatsoever — it’s a skin quality treatment, not a structural one. These are complementary tools, not competing ones. Many patients who need both improved skin quality and volume restoration use Rejuran alongside fillers or biostimulators like Juvelook, targeting different layers of the face in a coordinated protocol.
Rejuran vs Botox
Botox temporarily relaxes muscles to reduce dynamic (movement-driven) wrinkles. Rejuran improves skin quality and supports collagen at the dermal level. They work on completely different mechanisms and are frequently combined — Botox addressing muscle-driven lines, Rejuran addressing the skin surface itself.
Who Is a Good Candidate for Rejuran Injection?
One of Rejuran’s practical advantages is how broadly applicable it is. Unlike many treatments that suit a narrow patient profile, Rejuran injection is effective across a wide age range and most skin types. Ideal candidates include:
- ✔️ Adults from their mid-20s onwards — including younger patients using it as preventive skin health maintenance
- ✔️ Those with sensitive, reactive, or easily irritated skin that doesn’t tolerate more aggressive treatments
- ✔️ Patients with acne-damaged skin — redness, uneven texture, post-inflammatory marks, shallow scarring
- ✔️ Anyone dealing with sun damage or photoageing who wants cellular-level repair
- ✔️ Patients who want natural-looking, gradual improvement — skin that looks healthier, not treated
- ✔️ Those recovering from laser, peel, or microneedling treatments where accelerated healing is beneficial
Rejuran injection is generally not appropriate for pregnant or breastfeeding women, those with active skin infections in the treatment area, or patients with certain autoimmune conditions. Always provide your full medical history during consultation.
How Many Rejuran Injections Will You Need?
For optimal dermal rejuvenation, most practitioners recommend an initial course of 3–4 sessions spaced 3–4 weeks apart. This spacing allows each session to build on the collagen progress from the previous one, creating a cumulative regenerative effect that a single injection cannot achieve.
After the initial course, maintenance sessions every 4–6 months help sustain the improvement. Given the collagen-stimulating nature of the treatment, results from well-maintained Rejuran patients tend to be durable and compound over time — the skin genuinely improves with consistent treatment in a way that purely hydrating boosters don’t replicate.
Safety Profile: Is Rejuran Injection Safe?
Rejuran has one of the best safety profiles among all injectable skin treatments. PN is a naturally occurring biological molecule, fully biodegradable, and not associated with severe immune reactions or permanent residue in the body. It has received regulatory approval in over 30 countries including CE certification (Europe) and KFDA approval (Korea), and PharmaResearch’s three decades of research in regenerative medicine underpin its safety data.
Common, expected side effects are mild and temporary: small injection-site bumps (24–48 hours), mild redness and swelling (1–3 days), occasional minor bruising (up to 2 weeks). Serious complications are rare when administered by experienced practitioners using authentic product.
For a broader scientific understanding of polynucleotides and their documented role in human biology and medical regenerative applications, the Wikipedia article on polynucleotides is a clear, neutral reference point.
Is Rejuran Injection Worth It?
Measured against what it delivers — genuine biological improvement in skin quality, barrier function, and collagen density, building progressively over weeks and lasting 6–12 months — Rejuran injection represents one of the most substantive investments available in non-surgical skin rejuvenation. It doesn’t produce a dramatic transformation in the way a surgical procedure might. What it produces is something many patients find more valuable: skin that looks genuinely healthier, younger, and more radiant in a way that reads as entirely natural.
For those who have spent years pouring money into skincare products that work on the surface, Rejuran injection offers something fundamentally different — a treatment that works from the inside of the dermis outward, addressing the biological root causes of ageing and skin degradation rather than applying a temporary topical fix.
If you’re ready to explore the Rejuran range, you can browse all five formulations below:
- → Rejuran Healer — foundational skin health and collagen boost
- → Rejuran I — periorbital and under-eye rejuvenation
- → Rejuran HB — healing and deep hydration combined
- → Rejuran Black — premium anti-aging and pigmentation
- → Rejuran TrueSkin — high-concentration next-generation PDRN
Disclaimer: This post is for informational purposes only and does not constitute medical advice. Always consult a qualified medical professional before undergoing any injectable treatment.
