What PDRN Is and How It Works
PDRN (polydeoxyribonucleotide) is a purified DNA extract derived from salmon milt — the reproductive cells of Oncorhynchus mykiss (rainbow trout or chum salmon). The salmon origin is not incidental: salmon PDRN has unusually high structural compatibility with human PDRN receptors, specifically the A2A adenosine receptor, which plays a central role in triggering tissue repair and anti-inflammatory pathways.
When injected into the dermis, PDRN binds to these receptors and activates fibroblast proliferation — the cells responsible for producing collagen and elastin. The net effect is increased extracellular matrix production, improved skin hydration, and accelerated wound healing capacity. Clinically, this translates to improvements in skin texture, reduction in pore visibility, softening of fine lines, and more uniform skin tone over a treatment course.
Rejuran Healer (the branded product from Pharmaresearch Products, South Korea) is the most widely used PDRN injectable in Korean clinics and the treatment most international patients refer to when they use the term “rejuran.” Other PDRN products exist, including Placentex (European) and generic formulations — but Rejuran Healer has the longest Korean clinical track record and is what most Korean clinics stock.
Korean dermatologists and plastic surgeons began using PDRN clinically in the early 2010s. The extensive treatment volume over 10+ years in Korean clinics has produced a safety and efficacy record that is well-established in the Korean medical literature.
Rejuran vs Fillers vs HA Boosters vs PRP
The injectable landscape in Korean clinics is varied, and rejuran is frequently confused with other treatments. The mechanisms are distinct and not interchangeable.
| Treatment | Mechanism | What It Addresses | Sessions | Korea Cost |
|---|---|---|---|---|
| Rejuran PDRN | Stimulates fibroblast activity via A2A receptor — tissue regeneration | Skin texture, pore size, fine lines, wound healing capacity | 3 sessions (initial), then 1–2/year | ₩150,000–350,000 per session |
| HA filler | Physically occupies space in dermis or subcutis — volume restoration | Deep folds, hollowing, lip volume, facial contour | Single session; repeat at 12–18 months as product dissolves | ₩300,000–800,000 per syringe |
| HA skin booster (Juvederm Volite, Restylane Skinboosters) | Hydrophilic HA draws water into dermis — hydration and elasticity | Skin dryness, early fine lines, overall skin quality | 2–3 sessions, then 1–2/year | ₩200,000–400,000 per session |
| PRP (platelet-rich plasma) | Patient's own growth factors stimulate collagen — autologous regeneration | Similar to PDRN — texture, tone, wound healing | 3–4 sessions, then 2/year | ₩150,000–300,000 per session |
| Exosomes | Cell-derived vesicles carrying signalling proteins — next-generation regenerative | Skin repair, post-procedure healing, inflammation reduction | Varies by protocol | ₩300,000–600,000 per session |
The key distinction: rejuran and its analogues improve the quality of existing skin — they do not change facial structure, add volume, or address bone or fat loss. A patient with significant midface hollowing or deep nasolabial folds needs filler, not rejuran. A patient with good structure but dull, uneven skin texture is the appropriate rejuran candidate.
Protocol, Sessions, and Realistic Results
The standard rejuran Healer protocol for skin quality improvement is three sessions spaced 2–4 weeks apart. This schedule reflects the biology: PDRN stimulates a healing cascade that requires weeks to produce visible changes in collagen density. The first session initiates the process; the third consolidates it.
Immediate post-injection appearance includes fine papules (small raised bumps at injection points) that resolve within 24–48 hours. Bruising at injection sites is possible and typically resolves within 5–7 days. There is no meaningful downtime — most patients return to normal activity the same day — but the papule phase makes the treatment visible at close inspection for 1–2 days.
Results become apparent from approximately 2–4 weeks after the second session. Improvements include finer skin texture, reduced pore appearance, and a more even, hydrated surface. The effect is not dramatic in the way filler or surgical results are — rejuran improves what is already there rather than changing structure. Patients should adjust expectations accordingly.
For international patients visiting Korea who cannot complete a full 3-session protocol during a single trip, one session provides partial benefit. Some Korean clinics offer an accelerated protocol (2 sessions within a 10–14 day stay) that patients can supplement with a maintenance session at a domestic clinic if the product is available locally.
Maintenance: 1–2 sessions per year after the initial course sustains results. The collagen produced by the initial protocol continues to provide benefit after PDRN is metabolised, but new collagen production requires ongoing stimulation.
Combining Rejuran with Surgery or Other Injectables
Rejuran is frequently combined with other treatments in Korean clinics, but timing relative to surgery is important.
Pre-surgery: Rejuran delivered 5–7 days before a surgical procedure is generally safe, allowing the papule phase to resolve before the surgical date. Some surgeons recommend rejuran in the weeks before surgery on the basis that improved skin quality may support healing — this has limited formal evidence but is common practice in Korean clinics.
Post-surgery: Rejuran should not be injected directly into healing surgical incisions or actively swollen areas. For facial surgery patients (rhinoplasty, blepharoplasty, facelift), the standard recommendation is to wait until primary swelling has substantially resolved — typically 3–4 weeks post-operatively. Rejuran in anatomically separate areas (neck, hands, under-eye with careful placement) may be possible earlier, depending on the surgeon’s assessment.
Combined with other injectables: Rejuran and HA fillers address different problems and are routinely combined in the same appointment in Korean clinics — rejuran for skin quality, filler for volume. Combined sessions are common; the two treatments do not interact adversely. Rejuran and skin boosters can also be combined, though their mechanisms overlap more and combined sessions are mainly useful for patients prioritising comprehensive skin quality improvement.
Is rejuran safe? Is it FDA approved?
Rejuran Healer is approved by the Korean MFDS (Ministry of Food and Drug Safety) and is used routinely in Korean clinics. It is not FDA-approved for use in the United States, which is why it is rare in US med spas. It is CE-marked and available in some European markets. Adverse reactions are uncommon and typically limited to injection-site bruising and temporary papules. The safety profile from Korean clinical use over 10+ years is well-established.
How long do rejuran results last?
Improvements from a completed 3-session protocol typically persist for 6–12 months, after which maintenance sessions are recommended. The treatment stimulates collagen production — the collagen persists even as the PDRN is metabolised, which is why results outlast the product itself. Consistent maintenance keeps the skin in an improved state.
Can I get rejuran during my plastic surgery recovery in Korea?
Timing matters: rejuran should not be injected into healing surgical incisions or actively swollen tissue. For facial surgery patients, most surgeons recommend waiting until primary swelling has substantially resolved — typically 3–4 weeks post-op for rhinoplasty or eyelid surgery. For patients adding rejuran pre-surgery: do it 5–7 days before the surgical date to allow papule healing. Confirm timing with your surgeon at the pre-op consultation.