An ECM booster that places real collagen scaffold into thin skin around the eyes and mouth. Changes begin after a single session.
💡 At a Glance
· Re2O Fine is an under-eye and perioral skin booster made from human dermal ECM (extracellular matrix) milled to about 50 µm, half the particle size of standard Re2O.
· Procedure time about 20–30 minutes, topical numbing cream, downtime of 1–2 days for needle marks and up to a week if bruising occurs.
· Texture and firmness improve from 1–2 weeks; density, elasticity and wrinkle depth keep improving over 8–20 weeks. The clinical trial tracked results for 20 weeks after a single injection.
· Best for: hollow under-eyes, fine lines and dark-circle tone, perioral fine lines, and anyone in their 30s–60s whose thin skin showed lumps or a bluish tint with other boosters.
What exactly is Re2O Fine?
Re2O Fine (Elravie Re2O Fine, ECM booster, hADM skin booster, sold as BNAJU in Japan) is a skin booster made from human acellular dermal matrix (hADM: donated human dermis with cells and immunogenic material removed, leaving only the collagen and elastin scaffold), micronized to an average of about 50 µm and injected into the dermis of thin-skinned areas.
Where standard Re2O is a 5 cc product that rebuilds dermal density across the whole face, Re2O Fine is the "precision version": particles roughly half the size, in a 2 cc vial. It launched in Korea in December 2025 and was designed for areas like the under-eyes, crow's feet, perioral lines and neck, where larger particles can show through or leave an uneven surface. Rejuran (PN) and Juvelook (PDLLA) work by stimulating skin to make collagen; the Re2O family instead delivers a pre-built collagen and elastin scaffold. That is the fundamental difference.
| Item | Details |
|---|---|
| Type | Injectable (human-tissue-derived ECM skin booster) |
| Mechanism | Direct replenishment of dermal ECM (collagen, elastin, GAGs) plus fibroblast recruitment |
| Procedure time | About 20–30 minutes (numbing time separate) |
| Anesthesia | Topical cream (local nerve block added if needed) |
| Downtime | Needle marks and embossing 1–2 days; bruising up to 1 week |
| Pain | 2–3 / 10 (widely reported as milder than Rejuran) |
| Onset | Texture and firmness from 1–2 weeks; density and wrinkle changes clearer after 8 weeks |
| Duration | About 6–12 months (individual variation) |
| Sessions | Start with one; 2–3 sessions 3–4 weeks apart only if the dermis is markedly thinned |
| Indications | Under-eye hollowing, fine lines and dark-circle tone, perioral fine lines, loss of firmness in thin skin |
| Contraindications | Pregnancy or breastfeeding, active skin inflammation or infection, autoimmune disease, keloid tendency; prior filler in the area must be disclosed |
How it works, and the clinical evidence
Under-eye hollowing and thinning come from loss of dermal ECM (extracellular matrix: the mesh of collagen, elastin and hyaluronic acid that gives skin its framework). hADM, the raw material of Re2O Fine, is human dermis with that framework preserved. By manufacturer data it is roughly 89% collagen, 3% elastin and 0.4% GAGs including hyaluronic acid. Once in the dermis, the particles act as an immediate physical scaffold; your own fibroblasts (collagen-producing cells) then migrate into them and lay down new collagen, gradually replacing the implant with your own tissue.
The evidence comes from a randomized, split-face, double-blinded trial at Yonsei Severance Hospital. Lee et al. (2026, International Journal of Molecular Sciences) injected Re2O (phADM) into one cheek and a hyaluronic acid booster into the other in 20 adults (mean age 54.7) and followed them for 20 weeks after a single session. The Re2O side showed significantly greater gains than the HA side in skin density and volume at every time point, in elasticity at weeks 4 and 20, in pore area from week 12, and in hydration from week 8. Infraorbital wrinkles and nasolabial fold depth were significantly reduced at every assessment, and periorbital and cheek lifting indices were higher than control at week 20. In animal and cell studies, fibroblasts migrated into the particles, type I and III collagen and elastin synthesis rose dose-dependently, and inflammatory signals (IL-1β, TNF-α, IL-6) were suppressed rather than triggered. No serious adverse events occurred; only transient redness and swelling were reported.
Two caveats. The study was small (20 subjects, one center), ran only 20 weeks, and the test product included a non-crosslinked HA carrier, so the effects cannot be fully separated. No separate comparative trial of the 50 µm Re2O Fine formulation in the under-eye area has been published yet, so under-eye results must be interpreted from the same-material data plus clinical experience.
Who is it recommended for?
- Under-eyes that look sunken and shadowed: Best when the cause is thinning skin letting vessels and muscle show through, rather than deep hollowing that needs fat repositioning. Dark-circle tone tends to brighten gradually.
- Fine lines around the eyes and mouth that deepen when you smile: Suited to the residual lines that stay after Botox because the skin itself is thin.
- Anyone who had a bluish tint (Tyndall effect) or lumpiness from HA filler under the eyes: Human-tissue particles are not a light-scattering gel, so the Tyndall effect is essentially absent, and 50 µm particles do not show at the surface.
- Anyone who found Rejuran Eye painful or heavily embossed: Formulated at a pH close to body tissue, so injection sting is comparatively mild.
- International patients who want to refine the eye area in one visit to Korea: With 20-week results confirmed from a single session, a one-visit plan is realistic.
If under-eye fat is bulging, if there is marked skin laxity, or if immediate large-volume correction is the goal, a different approach takes priority over Re2O Fine alone.
The procedure and how long it takes
- Numbing: Topical cream for about 30 minutes. The under-eye is nerve-sensitive, so a local block is added when needed.
- Injection: Because the under-eye and periorbital area is vessel-rich, the product is spread in small aliquots into the mid-dermis with a cannula (blunt-tipped needle) or a very fine needle. One 2 cc vial is distributed across both under-eyes, or eyes plus perioral area.
- Finish: Gentle pressure to even out distribution, then cooling and home. Total time including numbing is about an hour.
Aftercare and precautions
The bumpy embossing and needle marks right after injection usually settle within 1–2 days; bruising, if it occurs, can last 3–7 days. You can wash your face the same day and wear light makeup the next day. Avoiding intense exercise, saunas and alcohol for about a week helps the material settle.
One point worth stating honestly: right after injection, the carrier (saline and HA) goes in together with the particles, so the under-eye looks filled immediately. The carrier is absorbed over 2–4 weeks, and some people feel at that stage that the effect has "faded." The actual dermal rebuilding accumulates over the following 8–20 weeks, so judge results no earlier than two months out.
On safety, a 2026 case report in the Journal of Cosmetic Dermatology (Sung et al.) described a vascular occlusion after Re2O (phADM) injection. Unlike HA filler, this is a particulate product with no dissolving enzyme, so vessel-dense zones like the under-eye and glabella must be treated by clinicians familiar with the anatomy, using a cannula and small, dispersed aliquots. Sudden severe pain after treatment, or skin turning white or net-like, requires immediate contact with the clinic.
How DIORE approaches it
In our clinic we treat Re2O Fine as "Re2O for the eye area" and plan it separately: standard Re2O 5 cc for the full face, Re2O Fine 2 cc for thin areas like the under-eyes, crow's feet and perioral lines, often combined on the same day. For patients traveling from abroad we do not assume "three sessions, 3–4 weeks apart." The clinical trial itself was a single-session design, and in our experience many patients see meaningful under-eye texture and tone change from one session alone. We suggest 2–3 sessions only for markedly thinned dermis or deep hollowing, and decide on maintenance after reviewing the skin at 6–12 months.
When combined with energy devices on the same day, the injectable goes last. Ultherapy or Thermage first, then Potenza, then Re2O Fine: each works at a different layer, so the skin is not overloaded, and the ECM particles settle into a regenerative environment the energy treatments have already opened.
Frequently Asked Questions
Q1. Does Re2O Fine work after just one session?
Yes. The 2026 Severance trial using the same material confirmed improvements in density, elasticity and under-eye wrinkles for 20 weeks after one injection. If your skin is very thin or the hollowing is deep, adding 1–2 sessions at 3–4 week intervals makes the change more pronounced. For a one-visit international patient, a single-session plan still gives a meaningful result.
Q2. Re2O Fine vs Rejuran Eye: which is better for under-eyes?
They do different jobs. Rejuran Eye uses PN to stimulate cell repair and refine texture and fine lines; Re2O Fine delivers collagen scaffold directly to restore thickness and tone in thinned dermis. If the main problem is a sunken, shadowed under-eye from thinness, choose Re2O Fine; if it is dryness and rough texture, Rejuran Eye fits better. Re2O Fine tends to be less painful with less embossing, and alternating the two is also an option.
Q3. How long do bruising and swelling last after under-eye Re2O Fine? Can I fly the next day?
Embossing and needle marks last 1–2 days; bruising, if any, 3–7 days. Flying the next day is possible, but cabin dryness and long periods of sitting can extend swelling by about a day, so we recommend treatment 2–3 days before departure. Concealer to cover bruising can be used from the next day.
Q4. Can Re2O Fine cause a bluish Tyndall effect under the eyes?
Rarely. The Tyndall effect happens when transparent HA gel sits too superficially and scatters light; Re2O Fine is an opaque human-tissue particle milled to 50 µm, so it does not show through like a gel. Concentrating it in one spot can, however, leave a small palpable lump, so dispersed injection technique matters.
Q5. Can I have it on the same day as Ultherapy or Thermage?
Yes. Ultherapy targets the SMAS layer, Thermage the deep dermis, and Re2O Fine the thin superficial dermis, so the layers do not overlap. The rule is energy devices first, injectables last.
Final thoughts
Re2O Fine places a collagen scaffold directly into areas like the eyes and mouth that were hard to treat because the skin is so thin. Its strengths are that change starts from a single session and builds over 20 weeks, with little Tyndall effect or embossing; its caveat is that in a vessel-rich zone, the injector's anatomical skill decides both the result and the safety. Related reading: Re2O: Which Skin It Suits and Why to Get It in Korea, Re2O with Ultherapy, Thermage and Potenza on the Same Day?, Rejuran Healer, Eye, HB and S: What's the Difference?.
ℹ️ This content is for general medical information and does not replace an individual consultation. Results vary with each person's skin, and accurate diagnosis and advice should come from an aesthetic medicine specialist.
References
- Lee YI, Chau NH, Nguyen NH, Ham S, Baek Y, Kim J, Lee JH. Injectable Particulated Human Acellular Dermal Matrix Booster for Skin Restoration: An Integrated Randomized, Split-Face, Double-Blinded Clinical Trial and Preclinical Study. Int J Mol Sci. 2026;27(5):2193. https://doi.org/10.3390/ijms27052193
- Sung et al. Vascular Complication Following Injection of Particulated Human Acellular Dermal Matrix: A Case Report. J Cosmet Dermatol. 2026. https://doi.org/10.1111/jocd.71049
- Park TH, Choi WY, Lee JH, Lee WJ. Micronized Cross-Linked Human Acellular Dermal Matrices: An Effective Scaffold for Collagen Synthesis and Promising Material for Tissue Augmentation. Tissue Eng Regen Med. 2017;14:517–523.