Retizen in Seoul — a collagen skin booster that firms from within
A true collagen skinbooster that firms from within the skin
Overview
Retizen in Seoul (also known as Laetigen) is a collagen skin booster: instead of asking your skin to make collagen from scratch, it replenishes intercellular components directly, improving elasticity, tone and pore appearance. It is one of the gentler options at VOS, often chosen by people who want a treatment with very little pain.
Dr. Hongseok Kim recommends Retizen for dry, dull skin, sagging pores and fine lines, and for thin skin with low elasticity. Improvement is usually felt within 1–2 weeks and lasts around 6–12 months with maintenance; results vary by person.
Is Retizen right for you?
- Those concerned about dry, dull skin
- Those concerned about sagging pores and fine lines
- Those who want a treatment with very little pain
- Those concerned about thin, low-elasticity skin
- Those with dry and dull skin
- Those with enlarged pores and fine lines
What Retizen does in the skin
01Enhances skin functionality by replenishing intercellular matrix with 100% pure real collagen.
Laetigen is a collagen booster injection that directly replenishes Type 1 collagen, a key component of the dermis layer. Healthy skin has a firm structure in its layers, but as we age, the dermal layer deteriorates, collagen production declines, and elastin decreases. This leads to wrinkles and dryness in the epidermis. Laetigen restores the skin’s natural strength by delivering 100% pure Type 1 collagen directly into the skin layers. It rebuilds the weakened structure and enhances the skin’s inherent functionality. Directly inject collagen into the weakened skin layer, rather than boosting collagen production. Collagen, elastin, and hyaluronic acid levels increase, filling the gaps between cells to enhance elasticity and radiance.
02A safe injection produced through a sterilization process and proprietary purification process.
Laetigen, composed of 100% Type 1 collagen—the primary component of the human dermal layer—is produced through a sterilization process to ensure safety. This product is made using a advanced multi-stage filtration system to extract high-purity collagen, resulting in a neutral formulation that minimizes post-treatment swelling and discomfort. Additionally, it is certified by the U.S. FDA, offering enhanced reliability and trust.
Session, comfort, downtime, results
- Session time
- Within 20 minutes
- Comfort
- Numbing cream; mild discomfort only
- Downtime
- Temporary redness or swelling for a few days is possible
- Aftercare
- No washing or makeup for 24 hours; no sauna, hard exercise or alcohol for a week
- Results
- Felt within 1–2 weeks; about 6 months to 1 year (varies)
- Effective for enhancing skin radiance, elasticity, and hydration
- Results last for 6 months to 1 year with 3 sessions at monthly intervals
- Treatment Time: within 20 minutes
- Simple topical anesthesia
- Immediate return to daily activities post-treatment (minor redness may occur for 3-5 days)
Results, timing and recovery vary from person to person. Nothing here replaces an in-person consultation.
Retizen Pricing at VOS
Retizen is not on VOS’s current English price list. Send your concern and a photo on WhatsApp and you will get a quote before anything is scheduled.
Related treatments
Rejuran
Restoring Skin’s Self-Recovery Environment
Skin RegenerationFine Line Improvement- Those with thinner, more sensitive skin
- Those concerned about fine lines and rough texture
From ₩300,000 before VAT
How Rejuran works
Juvelook
Designing the skin’s natural regenerative power
Fine wrinkle improvementSkin texture improvement- Those who have started to develop fine wrinkles around the eyes, forehead, mouth, etc.
- For those with rough skin surfaces and uneven texture
From ₩1,000,000 before VAT
How Juvelook works
Hilo Wave
Skin quality improvement considering both skin moisture and structure
Volume ImprovementSkin Elasticity Improvement- Those who want overall skin quality improvement
- Those worried about needling, marks, swelling, or embossing
From ₩600,000 before VAT
How Hilo Wave works
Questions patients ask about Retizen
How much does Retizen cost?
Who is Retizen suitable for?
What should I avoid after Retizen?
What is the procedure — does it hurt?
When do results show and how long do they last?
About Dr. Hongseok Kim
Dr. Kim performs your Retizen himself — from the first skin analysis to the follow-up check.
Dr. Kim focuses on aesthetic dermatology — skin regeneration, facial contour and healthy aging — and builds each plan from a close look at the individual patient's skin and goals, aiming for natural, refined results.
At VOS the same specialist is responsible for the whole course of care: diagnosis, the procedure itself and follow-up. An accurate reading of skin structure and how it changes is what makes results more complete and keeps the risk of side effects low.
Credentials & appointments
- Current
- Medical Director, VOS Dermatology Clinic
- Board-certified dermatologist
- Education
- Graduated first in class, medical school
- Academic appointments
- Adjunct Professor, Dept. of Medical Aesthetics, Cheongju University
- Adjunct Professor, Dept. of Beauty Medical Science, Dongguk University
- Professional leadership
- Director, Korean Dermatologist Association (KDA)
- Director, Korean Association for Anti-Aging Dermatology (KAAD)
- Committees
- Academic Committee Member, Korean Dermatological Association
- Information Committee Member, Korean Dermatologist Association (KDA)
- Memberships
- Korean Society for Dermatologic Functional Medicine
- Korean Society for Laser Medicine and Surgery
Brand advisory
- Skincare
- The Scent
- SkinCeuticals
- La Roche-Posay
- AHC
- Bioderma
- Etat Pur
- Injectables
- Juvelook
- Revive
- Lafullen
- Rejuran
- Devices
- Ulthera
- Thermage
- Sofwave
- CoolSculpting
- Mirajet
Lecturing, live demonstrations and brand education — in Korea and across Asia.
- presentations & lectures listed
- 116
- years covered by the list
- 2016–2026
- in 2023, the busiest year listed
- 25
LectureJULIA SUMMIT GLOBALJuvelook Journey — invited lecture · 2025 
ConferenceAPS Korea 2026Aesthetic Plastic Surgery Korea · 2026 
Conference28th KDA Spring ConferenceKorean Dermatologist Association · 2026 
ConferenceKOREADERMA 2025COEX, Seoul · 2025 
Live demoIMLG 2025Live injection training for international physicians · 2025 
LectureJULIA SUMMIT ASIA 2025Presentation, Hong Kong · 2025 
Live demoIMLG 2025Faculty & attendees · 2025 
Brand eventSkinCeuticalsNext Beauty Code, Taiwan · 2025 
Live demoIMLG 2025Live demonstration, explained step by step · 2025 
Brand eventCOSRXBrand event, Seoul · 2025
Selected international & major meetings
- 2026
- APS Korea 2026
- 28th KDA Spring Conference
- Invited lecture, Baim Global Jupiter Symposium
- 2025
- JULIA SUMMIT GLOBAL – Juvelook Journey
- JULIA SUMMIT ASIA 2025Hong Kong
- KOREADERMA 2025
- SkinCeuticals: Next Beauty CodeTaiwan
- 9th KDA procedural skills training
- 2024
- AMWC-TDAC Taiwan
- Juvelook Launching Symposium in Taiwan
- KSDS 2nd International Congress Seoul
- 1st Ulthera Focus Group Meeting
Show 2 earlier yearsShow fewer
- 2023
- AMWC Japan
- 41st Annual Meeting, Japanese Society of Aesthetic Dermatology
- ACDS 2023
- MEVOS Dalian
- 2022
- ASLMS (American Society for Laser Medicine & Surgery)
- 13th I-SWAM Indonesia Convention Exhibition
Broadcast
- Morning N — hyperhidrosis and choosing cosmetics
- “Golden time of skin lifespan” (Jul 2021)
- Park Yong-kwan's Radio Show — regular Monday guest
- Good Morning — spring sunlight and skin (Mar 2023)
- Jo Woo-jong's FM Daehaengjin — Dr. Family corner
- Men On Air — summer skin care
Papers & books
- Juvelook Comparative Pain Assessment
- Cosmetic Counseling Expert Course
- Cosmetic Ingredients for Skin Care
Source: VOS Dermatology's official Korean profile of Dr. Kim.
Meet Dr. KimCreators who filmed their treatment at VOS.
Each video comes with Dr. Kim's notes on what was done, why, and the listed price. Opinions are the creators' own; results vary.
Gouri and Belotero Revive in Seoul: A Mother’s Skin Booster Case
Rina brought her mother, visiting from abroad, for a surprise skin treatment. I explain why we paired Gouri, a PCL collagen stimulator, with Belotero Revive, and what to expect.
Juvelook, Anti-Wrinkle Injection and Rejuran Lips in Seoul: A Natural Refresh Case
Oxana wanted to refresh her lower face and neck without looking done. I explain her combination of laser, Juvelook, anti-wrinkle injection and Rejuran in the lips, and why lips can be treated for quality, not volume.
Redness, Pores and Uneven Tone in Seoul: A Real Patient Case
Aizhan came to Seoul with three concerns at once: redness, enlarged pores and uneven tone. I explain how I build one plan for skin like hers, and what it realistically changes.
Skin Smoothing Injection + ECM Booster in Seoul: A Real Case for Textured Skin
Heli’s skin looked textured and stiff even under makeup. I explain why we paired skin smoothing injection with an ECM booster, what ECM actually means, and how the plan was built for her skin.
Skin Smoothing Injection + Rejuran HB in Korea: A First-Timer’s Real Case
Suhandi was scared of needles and had never had a skin treatment. I explain why we paired skin smoothing injection with Rejuran HB, what the session felt like, and when results show.
Thulium Laser, CO₂ Spot Removal and Nuviju in Seoul: A Real Case
Manel stopped posting because she no longer liked her skin. I explain her one-visit plan: a full-face thulium laser, CO₂ for spots and Nuviju for the chin and jawline.
Ultherapy Prime for a Double Chin in Korea: A Real Case
Krisha flew to Seoul to tighten the area under her chin. I explain what Ultherapy Prime does there, when a double chin is fat rather than laxity, and what to expect after.
VOS Dermatology Blog
Plain-language guides written by Dr. Hongseok Kim, board-certified dermatologist — treatments, recovery, cost and planning your visit to Seoul.
Rejuran Healer vs Juvelook: Which Fits? Recovery, Risks, Days
Rejuran healer vs juvelook: both leave small bumps for a few days, but Juvelook builds over weeks. VOS Dermatology, Gangnam, on trip length and sessions.
Korea Rejuran HB Consultation Booking Appointment: Who Fits?
Planning a Korea Rejuran HB consultation booking appointment? Who HB suits, what decides the cost and what to send first, from VOS Dermatology, Gangnam.
Rejuran How Long Does It Last? Results, Sessions & Upkeep
Rejuran how long does it last? After a full course, often several months. Dr. Hongseok Kim of VOS Dermatology, Gangnam, explains sessions and upkeep.
Rejuran Recovery Day by Day: When Do Bumps Go? Methods, Risks
Rejuran recovery day by day: bumps usually settle within a day or two, bruises take longer. Plan trip days, methods, risks. VOS Dermatology, Gangnam
Juvelook Soft vs Volume: Which Fits? Cost, Reviews, Recovery
Juvelook soft vs volume: the lighter form treats crepey skin, Volume adds support. Dr. Hongseok Kim on cost, reviews, recovery. VOS Dermatology, Gangnam.
Korea Thermage FLX Procedure Steps in Order: Who Should Wait?
Korea Thermage FLX procedure steps in order, who should wait, what decides the cost, and recovery, from Dr. Hongseok Kim of VOS Dermatology, Gangnam.
What international patients wrote on Google Maps.
Screenshots of public reviews left on Google — in their own words, unedited. Experiences and results vary from person to person.
Before you book, hear it from the doctor himself.
Slide through 17 videos on lifting, skin boosters and traveling for treatment. Korean audio — everything plays right here.
Travel"Flying tomorrow, no bruising or swelling?" Top 3 No-Downtime Lifting (Ultherapy prime,Sofwave,Opus)
LiftingAfter Ulthera & Thermage, What's Next? Dermatologist with 21 Years of RF Experience Breaks It Down!
Skin boostersA Dermatologist with 21 Years of Experience Breaks Down the Skin Booster Family Tree
JuvelookMust-Know Before Getting JuveLook! | What It Can & Can’t Do, Clinic Tips by Dr.DTS
JuvelookPairing Juvelook with This Can Double the Firming Effect (And Ease Nodule Concerns)
JuvelookEverything About Juvelook — Effects, Real Treatment Review, Rejuran Comparison
Skin boostersDoctors Won’t Talk About This Treatment Yet… So I’m Revealing Everything | ECM Skin Booster Q&A
Skin boostersWhy does 'that' super famous skin booster contain 'filler' ingredients?
Skin boostersGOURI Is Korea’s Hottest Skin Booster — But What About the Bruising?
Anti-agingSurface Treatments vs Deep Treatments | Which One Actually Makes You Look Younger?
AftercareDid you just pay a fortune for a dermatology treatment? You'll 100% regret skipping this video.
Dr. KimSorry to my patients... I tried it on myself first (21-Year Derm's Self-Treatment Full Process)
BodyTrapezius Slimming for Sharp Shoulders ✨ How to Get That Clean, Angular Look (Spring/Summer Must)
Travel22-Hour Flight + High-Altitude UV: The One Thing a Dermatologist Used the Whole Time
ResearchScientists Erased a “Mark of Aging” Once Thought Irreversible | A New 2026 Aging Study | Dr. PIALNAM
PoresWhy Your Pores Won’t Shrink | What Actually Works? | Dr. DTS
SkincareWhy Your Expensive Vitamin C Isn’t Working｜How to Use It for Better Absorption｜Dr. PIALNAM
VOS Shorts
Get to know VOS in seconds — 60-second answers from Dr. Kim to the questions you’d ask in the chair. Everything plays right here.
How to get Juvelook without side effects
How long does Sofwave last?
Boost Your Results with Sofwave!
RE-TOURN! It's Different from Collagen Injections
Juvelook Skin Rejuvenation Effects
How many Ultherapy Prime shots are enough?
Want to look younger!?
Skin Booster: Myths and Facts
Most of Your Allergy Test Results Came Back Positive?! You Might Have OOO Syndrome!
More Isn’t Always Better!? How to Properly Use Moisturizer
Does Snail Cream Actually Contain Snails?
Hands-Free Exercises to Smooth Out Smile Lines
The Secret Habit of People Who Stay Healthy and Live Longer (Worth Millions)
Cleansing oil for sunscreen? Double cleansing? You’ve been doing it all wrong...
Father's Wisdom on Shaving (Secret to Avoiding Cuts)
If nothing you apply stops the dryness
What if you blindly apply too much sunscreen without knowing 'this ingredient'? Your skin will br...
2 Skincare Ingredients a Dermatologist Will Never Use (Be Extra Careful!)
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