Gangnam
Dr. Yoon-Gon Ryu
Aesthetic Medicine Specialist
Flagship clinic · KOL for leading lifting & regenerative devices · Featured in Authority Magazine (2026)
XERF delivers dual-frequency (6.78MHz + 2MHz) monopolar radiofrequency at 3 selectable depths, giving immediate contraction plus collagen remodeling over 1 to 3 months.
XERF is a non-invasive, dual-frequency monopolar radiofrequency (6.78MHz + 2MHz) treatment that tightens skin at three selectable depths, reaching the SMAS layer. Developed in Korea and FDA-cleared in 2025, a 15 to 30 minute session gives immediate contraction plus gradual collagen remodeling over 1 to 3 months, with no downtime.
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XERF (The XERF, known in Korea as 세르프) is a non-invasive skin-tightening treatment built on multifrequency monopolar radiofrequency — introduced by its manufacturer, Cynosure Lutronic, as the world’s first multifrequency monopolar RF platform. Instead of a single frequency, XERF combines 6.78MHz and 2MHz energy so the treatment depth can be set to shallow, middle, or deep, delivering heat as far as the SMAS layer that surgeons address in lifting procedures. It is used for jawline, cheek, and double-chin tightening, and for refining fine lines, pores, and overall skin texture through collagen remodeling.
The technology is a Korean development story: XERF was cleared by Korea’s MFDS in January 2024, launched first in Korea in May 2024, reached North America in June 2025, and received US FDA clearance in August 2025, with more than 2,000 systems installed worldwide reported by mid-2026. After a wave of global celebrity buzz, it was featured in international media including NewBeauty and TODAY as one of 2026’s most talked-about skin-tightening treatments — and in Seoul you can experience it in the country where it was developed.
At Reberry Clinic in Seoul, Korea, XERF treatment is planned and reviewed by the clinic’s doctors with full English-language support for international patients. Because shot counts and intervals are individualised rather than standardised, a consultation confirms whether dual-frequency RF tightening fits your skin laxity and goals.
XERF is a radiofrequency device — not a laser. It delivers monopolar RF at two frequencies, 6.78MHz and 2MHz, and blends them to control how deep the heat concentrates: Shallow, Middle, or Deep, down to the SMAS layer. Lower frequencies penetrate deeper, so the dual-frequency design lets one platform treat fine surface texture and deeper laxity in the same session, something a conventional single-frequency (6.78MHz) monopolar RF system approaches with one fixed depth profile.
Comfort and consistency come from four supporting systems: Wave Fit variable pulse shaping adapts energy delivery; ICD (Integrated Cryogen Delivery) cooling chills the skin surface with each pulse; real-time impedance feedback reads how your tissue responds and adjusts output across 10 energy levels; and a patent-pending spider-pattern tip electrode spreads energy evenly. Four EFFECTOR tips — from a narrow 5×10mm tip for delicate contours to a 20×30mm tip for broad areas, with large tips delivering up to 600 shots — let the doctor match coverage to each zone of the face.
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The clinic’s doctors assess your laxity and select among the 3 depth settings — Shallow, Middle, or Deep — that blend the 6.78MHz and 2MHz frequencies for your goals.
One of 4 EFFECTOR tip sizes, from 5×10mm for narrow contours to 20×30mm for broad zones, is chosen; large tips deliver up to 600 shots per session.
Each pulse pairs ICD cryogen cooling on the surface with dual-frequency RF heating below, monitored by real-time impedance feedback across 10 energy levels.
Heat contracts existing collagen fibres during the 15 to 30 minute session, so some tightening is visible right away.
Over the next 1 to 3 months, new collagen forms and progressively firms the jawline, cheeks, and skin texture.
See representative outcomes from Reberry Clinic. Results build gradually and vary by individual; your plan is assessed at consultation.
The clinic’s doctors assess your skin laxity and goals, then plan depth settings, tip choice, and shot count for your face, explained in English.
After cleansing, the session itself typically takes 15 to 30 minutes, with integrated cooling accompanying every pulse.
Most patients complete treatment in 1 visit and return to normal activities, including makeup, the same day.
Some contraction is visible immediately, with the main firming building over 1 to 3 months as collagen remodels.
In practice, results are commonly maintained around 6 months to a year; for the first week, avoid heavy drinking, intense exercise, and saunas.
XERF is a non-invasive, dual-frequency monopolar radiofrequency (RF) treatment that delivers 6.78MHz and 2MHz energy to tighten skin at three selectable depths, down to the SMAS layer. Developed in Korea and launched there in 2024, it targets jawline definition, double chin, fine lines, pores, and overall texture.
XERF uses two frequencies, 6.78MHz and 2MHz, so heating depth can be set to shallow, middle, or deep, while conventional monopolar RF platforms run a single frequency with one depth profile. Different designs suit different goals; you can read about an established monopolar RF option on our Thermage FLX page.
Most patients tolerate XERF comfortably, often without numbing cream, thanks to integrated cryogen cooling that chills the surface with each pulse and the variable Wave Fit pulse design. You feel brief deep warmth as energy is delivered. Comfort varies by person and area, and your doctor adjusts across 10 energy levels.
No downtime is expected: XERF is non-invasive, and most patients return to normal activities, including makeup, the same day. Some notice mild redness or warmth for a few hours. For the first week, it is sensible to avoid heavy drinking, intense exercise, and saunas while the skin settles.
Some tightening appears immediately, because heat contracts existing collagen fibres during the session. The main improvement then builds gradually over 1 to 3 months as new collagen forms, firming the jawline and cheeks and refining texture. Photos at your review visit help track the change over that period.
In clinical practice, results are commonly maintained for around 6 months to a year, though this varies with age, skin condition, and lifestyle. Because XERF stimulates your own collagen, natural ageing continues. Many patients plan a maintenance session once earlier gains begin to soften, guided by their doctor’s review.
There is no fixed industry standard yet for XERF shot counts or treatment intervals, so plans are individualised at consultation. Large treatment tips deliver up to 600 shots in a session, and one 15 to 30 minute treatment is a common starting point, with reviews guiding any further sessions.
XERF is used on the jawline, cheeks, and double-chin area for tightening, and across the face for fine lines, pores, and texture. Four EFFECTOR tip sizes, from 5×10mm to 20×30mm, cover narrow and broad zones; for the body, we discuss options like RF body skin tightening.
Yes. XERF was cleared by Korea’s MFDS in January 2024, launched first in Korea in May 2024, and received US FDA clearance in August 2025. The manufacturer reports more than 2,000 systems installed worldwide as of mid-2026, following the North American launch in June 2025.
No. XERF is a radiofrequency (RF) device, not a laser: it heats tissue with dual-frequency monopolar RF at 6.78MHz and 2MHz rather than light energy. Some coverage has miscategorised it, but the accurate description is a multifrequency monopolar RF skin-tightening platform with three selectable depth settings.
Yes, XERF pairs well with skin-quality treatments, since RF tightening and regenerative boosters address different aspects of ageing. Many patients combine it with polynucleotide options such as Rejuran Healer or with injectables, sequenced by their doctor so recovery windows and heat exposure never overlap.
Aftercare is simple: for about 1 week avoid heavy alcohol, intense exercise, and saunas or hot baths, and keep skin hydrated with daily sun protection. No dressings are needed. A consistent routine supports collagen remodeling, and our skin care options can complement the tightening as results develop.
XERF carries a favourable safety profile when performed by trained doctors: real-time impedance feedback monitors tissue response, and integrated cryogen cooling protects the surface during each pulse. Typical effects are temporary redness, warmth, or mild swelling that settle within hours. Your medical history is reviewed beforehand to reduce risk.
Adults with mild to moderate skin laxity who want firmer jawline and cheek contours without needles or surgery are typical candidates. It also suits people focused on pores and early fine lines. More advanced sagging may call for different approaches, discussed alongside our face lift page at consultation.
XERF heats tissue with dual-frequency monopolar RF across selectable depths, while ultrasound devices focus acoustic energy at fixed depths — two different energy principles rather than a ranking. Some patients use them at different times for complementary goals; you can read about a micro-focused ultrasound option on our Ultherapy Prime page.
XERF pricing is confirmed at consultation rather than quoted as a fixed figure, because cost depends on the treatment area, tip selection, and the number of shots planned for your skin. Our English-speaking team explains what shapes the cost and reviews your full plan before any treatment begins.
Reberry Clinic offers XERF in Seoul, Korea — the country where the technology was developed and first launched in 2024. Consultations run in English with multilingual support for international patients, and our Seoul locations in Gangnam and Myeongdong are easy to reach by subway from most central districts.
A short stay of 2 to 3 days is enough, covering consultation, one 15 to 30 minute session, and a brief review. Because downtime is minimal, many visitors pair XERF with a glow-focused option such as our glass facial in the same trip, coordinated by our English team.
Yes, flying the same day or the next day is generally fine, since XERF is non-invasive with minimal swelling. Stay hydrated in flight and apply sun protection on arrival. Follow-ups can continue remotely in English from abroad, with your notes kept on file for any future visit to Seoul.
| XERF (dual-frequency RF) | Conventional single-frequency monopolar RF | Ultrasound-based lifting | |
|---|---|---|---|
| Energy / mechanism | Dual-frequency monopolar RF (6.78MHz + 2MHz), 3 depth settings down to SMAS | Single-frequency monopolar RF (typically 6.78MHz), one depth profile | Focused or parallel-beam ultrasound at fixed depths |
| Best for | Jawline, cheek, and double-chin tightening plus texture and pore refinement | Overall dermal tightening and texture | Deeper lifting points or mid-dermal laxity, depending on device type |
| Pain / comfort | Cryogen cooling with each pulse; often done without numbing cream | Heat pulses balanced by surface cooling | Brief deep warmth during pulses |
| Downtime | None expected; same-day return to routine | Minimal; possible mild redness | Minimal; possible mild redness or swelling |
| Results timeline | Immediate contraction, then builds over 1 to 3 months | Builds over 2 to 6 months | Builds over 2 to 3 months |
| Sessions | Individualised at consultation; no fixed standard interval yet | Usually 1 planned session | Usually 1 session or a short series |
| Cost factors | Depends on area, tip, and shot count; set at consultation | Depends on tip size and area; set at consultation | Depends on device and area; set at consultation |
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XERF is offered at all three Re:Berry locations, and pricing or scheduling can vary slightly by branch. You can review XERF lifting pricing at our Gangnam clinic, how XERF sessions run at our Myeongdong clinic, or XERF appointments at our Incheon Airport clinic before booking.
Message us on WhatsApp for a free consultation in English about XERF in Seoul.