Rejuran and Korean Skin Boosters: What They Are and Why They Work

If you’ve spent any time on Korean skincare forums, you’ve seen the name Rejuran. It’s the single most popular injectable skin treatment in South Korea, more common in Seoul dermatology clinics than Botox for patients under 40. In 2024, an estimated 1.5 million Rejuran treatments were administered in Korea. The waitlists at top dermatology clinics in Gangnam run two to three weeks.

And yet most Americans have never heard of it. It’s not FDA-approved in the United States. You can’t get it at your dermatologist’s office in New York or Los Angeles. The only way to access Rejuran is to fly to Korea, Japan, or Singapore, the three markets where it’s most widely used.

This guide covers what Rejuran actually is, the science behind it, the different formulations, what results look like, how much it costs, and why it remains unavailable in the US market.

What Is Rejuran Healer?

Rejuran Healer is an injectable skin booster made from polynucleotides (PN), fragments of DNA extracted from salmon. Specifically, it uses purified polydeoxyribonucleotide (PDRN) derived from salmon sperm DNA.

Before you dismiss that as marketing pseudoscience: PDRN has been studied extensively in wound healing and tissue regeneration since the 1980s. It’s used in burn units and post-surgical recovery across Europe and Asia. The mechanism is well-documented in peer-reviewed literature.

How PDRN Works in Skin

PDRN activates the A2A adenosine receptor on fibroblasts, the cells responsible for producing collagen, elastin, and extracellular matrix in your skin. When this receptor is activated, fibroblasts increase their activity:

• Collagen synthesis increases. Not the temporary plumping effect of hyaluronic acid fillers, but actual new collagen production in the dermis.
• Anti-inflammatory pathways activate. PDRN reduces IL-6 and TNF-alpha, two key inflammatory markers. This is why it helps with rosacea-prone and sensitized skin.
• Angiogenesis improves. New capillary formation means better blood flow to the skin, improving nutrient delivery and waste removal at the cellular level.
• Cell turnover accelerates. Damaged skin cells are replaced more efficiently.

The result isn’t the “frozen” or “filled” look of Botox and fillers. It’s a gradual improvement in skin texture, thickness, elasticity, and tone. Korean dermatologists describe it as making skin behave younger rather than just look younger.

What Rejuran Is Not

Rejuran is not a filler. It doesn’t add volume. It doesn’t paralyze muscles. It doesn’t resurface the skin. It works at the cellular level to improve the skin’s regenerative capacity. The changes are real but subtle. You won’t look dramatically different after one session, but after three to four sessions, the cumulative improvement in skin quality is significant.

The Four Types of Rejuran

Pharmaresearch, the Korean manufacturer, produces four formulations. Each targets a different concern.

1. Rejuran Healer (Original)

• Concentration: 2mg/mL PDRN
• Viscosity: Medium
• Target: Overall skin rejuvenation: improved texture, elasticity, hydration, fine lines
• Injection depth: Superficial dermis (papillary dermis)
• Technique: Multiple micro-injections across the entire face (sometimes called “skin nappage” or “micropuncture” technique)
• Sessions: 3-4 sessions, spaced 2-4 weeks apart
• Who it’s for: Anyone over 25 who wants to improve baseline skin quality. The most popular Rejuran variant by far.

2. Rejuran S (Scar)

• Concentration: Higher viscosity than Healer
• Target: Atrophic acne scars, ice pick scars, boxcar scars
• Injection depth: Deeper dermis, directly into scar tissue
• Technique: Injected precisely into individual scar depressions
• Sessions: 3-5 sessions depending on scar severity
• Who it’s for: Patients with acne scarring who want improvement without aggressive laser resurfacing. Often combined with subcision or fractional laser.

3. Rejuran I (Eye)

• Concentration: Lower viscosity, designed for thin periorbital skin
• Target: Under-eye fine lines, dark circles (vascular type), crepey eyelid skin
• Injection depth: Very superficial (the under-eye skin is only 0.5mm thick)
• Technique: Careful micro-injections in the tear trough and periorbital area
• Sessions: 3-4 sessions
• Who it’s for: Patients with early aging signs around the eyes. This is the formulation most patients fly to Korea specifically for, since there’s no equivalent treatment in the US for this area.

4. Rejuran HB (Hydro Booster)

• Concentration: PDRN + hyaluronic acid blend
• Target: Deep hydration + rejuvenation combined
• Injection depth: Superficial dermis
• Technique: Same nappage technique as Healer
• Sessions: 2-3 sessions
• Who it’s for: Patients with very dry, dehydrated skin who want both the regenerative benefits of PDRN and immediate hydration from HA.

Other Korean Skin Boosters Worth Knowing

Rejuran isn’t the only injectable skin booster available in Korea. The market has expanded significantly.

Juvelook (PDLLA + HA)

Manufactured by Humedix (Korea), Juvelook combines poly-D,L-lactic acid (PDLLA) with hyaluronic acid. PDLLA is a biodegradable polymer that stimulates collagen production over time, similar in concept to Sculptra (which is FDA-approved in the US) but in a micro-injection skin booster format rather than a deep-tissue filler.

• Mechanism: HA provides immediate hydration; PDLLA slowly dissolves over 6-12 months, stimulating progressive collagen production
• Cost in Korea: $300-$600 per session
• Sessions: 2-3 sessions, 3-4 weeks apart
• Key difference from Rejuran: Juvelook has a more pronounced volumizing effect over time. Some dermatologists prefer it for patients over 40 with more advanced skin laxity.

Profhilo

Developed by IBSA (Italy/Switzerland), Profhilo is widely available in Korea, Europe, and parts of Asia. It uses a patented combination of high-molecular-weight and low-molecular-weight hyaluronic acid without any chemical cross-linking.

• Mechanism: Bioremodeling. Spreads through tissue and stimulates collagen I, collagen III, elastin, and adipocyte stem cells
• Cost in Korea: $350-$600 per session
• Sessions: 2 sessions, 4 weeks apart (the “2+2 protocol”)
• Key difference: Profhilo has the highest HA concentration of any injectable product (64mg/2mL). Injection technique uses only 5 bio-aesthetic points (BAP) per side of the face, making it quicker and less painful than Rejuran.

Lenisna

A newer Korean skin booster using exosomes, extracellular vesicles derived from stem cells. Still relatively new, with fewer long-term studies, but gaining popularity in Korean clinics for its regenerative potential.

What a Rejuran Treatment Actually Looks Like

Here’s what to expect if you book a Rejuran Healer session at a Korean dermatology clinic:

Before the procedure:
– Consultation with the dermatologist (10-15 minutes). They’ll examine your skin, discuss your concerns, and recommend the appropriate Rejuran variant and injection plan.
– Topical numbing cream applied (lidocaine-based). You’ll wait 20-30 minutes for it to take effect.
– Face cleaned and prepped.

During the procedure:
– The dermatologist uses a fine-gauge needle (30G or 32G) to make dozens of micro-injections across the treatment area.
– Each injection deposits a tiny amount of Rejuran into the superficial dermis.
– The entire injection process takes 15-20 minutes.
– Pain level: 2-3 out of 10 with numbing cream. Most patients describe it as mildly uncomfortable, not painful.

Immediately after:
– Your face will have small raised bumps (papules) at each injection site. This is normal and expected.
– Mild redness, similar to a light sunburn.
– You can apply makeup after 6-12 hours (most clinics say the next morning).

Recovery timeline:
– Day 1-2: Papules visible, mild swelling. Avoid heavy exercise, alcohol, saunas.
– Day 3-5: Papules flatten and absorb. Redness fades.
– Day 7: Skin looks normal. Some patients notice improved hydration already.
– Week 2-4: Subtle improvement in texture and glow as collagen synthesis begins.
– After 3-4 sessions: Cumulative results: visibly improved skin texture, reduced fine lines, better elasticity, more even tone.

Results from a full course of Rejuran (3-4 sessions) typically last 6-12 months. Most Korean patients do maintenance sessions every 6 months.

Cost Comparison: Rejuran in Korea vs. Alternatives Elsewhere

The price difference is significant, but the more important point is availability. Rejuran simply isn’t an option in the United States. For patients who want PDRN therapy, Korea is the primary destination.

Why Rejuran Is So Much Cheaper in Korea

Several factors drive the cost difference:

1. Domestic manufacturer. Pharmaresearch is based in Korea. No import tariffs or distributor markups.
2. Scale. Millions of treatments per year across thousands of clinics means competitive pricing.
3. Market competition. Seoul has the highest density of dermatology clinics in the world. Clinics compete aggressively on price for popular treatments.
4. No insurance involvement. Cosmetic dermatology is cash-pay in Korea, which eliminates administrative overhead.

Why Rejuran Isn’t FDA-Approved in the US

This is the question every American patient asks. The answer has nothing to do with safety concerns.

The FDA approval process for injectables requires:
1. Pre-clinical testing (animal studies)
2. Phase I clinical trial (safety)
3. Phase II clinical trial (efficacy)
4. Phase III clinical trial (large-scale efficacy and safety)
5. FDA review and approval

This process takes 7-12 years and costs $50-$300 million. Pharmaresearch is a mid-sized Korean pharmaceutical company. The US market opportunity for Rejuran, while large, may not justify the investment timeline and regulatory cost when the product already sells extremely well in Asia and select markets.

There are also classification questions. The FDA would need to determine whether Rejuran is a drug (regulated by CDER), a biological product (regulated by CBER), or a device. PDRN from salmon DNA raises unique regulatory questions that don’t map cleanly to existing FDA categories.

Rejuran’s regulatory status globally:
– Korea (MFDS): Approved since 2014. Over a decade of market data.
– Japan (PMDA): Approved and widely used.
– Singapore (HSA): Approved.
– EU: Available in some markets; regulatory status varies by country.
– US (FDA): Not approved. Not currently in the FDA approval pipeline.

The safety profile in Korea is strong. Adverse events are rare and typically limited to injection-site reactions (bruising, temporary papules). Serious complications are extremely uncommon. But the absence of FDA approval means US dermatologists cannot legally inject it, and US patients cannot access it domestically.

Who Should Consider Rejuran (and Who Shouldn’t)

Good Candidates

• Age 25-55 with early to moderate signs of skin aging (fine lines, texture changes, loss of elasticity)
• Acne scar patients seeking improvement without aggressive downtime (Rejuran S)
• Patients with under-eye aging who haven’t responded well to fillers (Rejuran I)
• Patients with sensitized or rosacea-prone skin (PDRN’s anti-inflammatory properties help)
• Anyone who wants genuine skin quality improvement rather than temporary volumizing

Not Ideal Candidates

• Patients expecting dramatic, immediate results (Rejuran works gradually)
• Severe skin laxity requiring surgical intervention
• Active skin infections or inflammatory conditions at treatment sites
• Patients with fish allergies (Rejuran is derived from salmon DNA, so discuss with your dermatologist)
• Those seeking volume restoration (Rejuran doesn’t fill; consider fillers or fat transfer)

Combining Rejuran with Other Treatments

Korean dermatologists frequently combine Rejuran with other procedures in the same session or across a treatment plan:

• Rejuran + Botox: Rejuran for overall skin quality, Botox for dynamic wrinkles. Different mechanisms, complementary results.
• Rejuran + Laser toning (PicoSure, PicoWay): Laser addresses pigmentation; Rejuran improves underlying skin quality. Very common combination in Korean clinics.
• Rejuran S + Subcision: For deep acne scars, subcision breaks the fibrous tethering while Rejuran S stimulates new collagen in the scar depression.
• Rejuran + Profhilo or Juvelook: Some clinics alternate between these boosters for combined collagen stimulation.

These combination protocols are a key reason patients travel to Korea for skincare treatments. Korean dermatologists have a decade of experience optimizing multi-treatment protocols that simply aren’t possible in markets where Rejuran isn’t available.

How to Plan a Rejuran Treatment Trip to Korea

A full course of Rejuran requires 3-4 sessions spaced 2-4 weeks apart. This means you have two options:

Option A: Extended Stay (6-8 Weeks)

Stay in Seoul for the full treatment course. This makes sense if you’re combining Rejuran with other procedures (laser, Botox, health checkup, dental work) or if you want to experience Korea.

Option B: Split Protocol

Get 2 sessions during a 2-week trip to Korea, then return for the remaining sessions 3-6 months later. Some clinics will adjust the protocol to compress sessions into a shorter window, for example sessions at 10-day intervals instead of the standard 3-4 weeks.

What We Handle

InKoreaNow partners with vetted dermatology clinics in Seoul that have English-speaking staff and extensive experience treating international patients. We coordinate:

• Clinic selection based on your specific skin concerns
• Appointment scheduling around your travel dates
• Translation support during consultations
• Combining dermatology visits with other medical services at our partner hospitals including Severance Hospital and Korea University Anam Hospital

The Bottom Line

Rejuran represents a category of treatment that simply doesn’t exist in Western markets yet. It’s not a filler, not a toxin, not a laser. It’s a biostimulator that works at the cellular level to improve skin regeneration. A decade of clinical use in Korea has established both its safety profile and its effectiveness.

For patients willing to travel, Korea offers the world’s deepest expertise in Rejuran and other skin booster protocols, at prices 50-70% lower than comparable markets like Singapore or Japan.

Ready to Explore Rejuran Treatment in Korea?

We help international patients access Korea’s best dermatology clinics with full English coordination, from initial consultation to treatment scheduling and aftercare.

Tell us your skin concerns, and we’ll recommend the right clinic and treatment protocol for your goals.

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