Miso Clinic · Clinical Reference

GOURI: liquid polycaprolactone as a collagen stimulator

GOURI is the first fully liquid, particle-free polycaprolactone (PCL) injectable. This reference explains what it is, how it differs from particle-based PCL fillers, which plane we place it in and how we divide the points, and what becomes visible when.

Reference article Reading time ~8 min Reviewed 2026 Miso Clinic · Daegu, Korea

Definition

GOURI is an injectable collagen stimulator developed by Dexlevo (Seoul, South Korea), composed of 21% polycaprolactone (PCL) in a fully liquid, particle-free formulation. Unlike particle-based PCL fillers, which add volume at the injection site, GOURI is designed to diffuse through the deep dermis and stimulate fibroblasts to produce the patient's own collagen. It is administered by a physician, typically via cannula across the full face, and the PCL biodegrades over approximately 6–12 months.

Key facts

GOURI at a glance
Product class	Injectable collagen stimulator (biostimulator)
Active material	Polycaprolactone (PCL), 21% concentration
Formulation	Fully liquid; no microspheres or particles
Proprietary technology	CESABP — Collagen Enabled Solubilized Active and Biodegradable Polymer
Manufacturer	Dexlevo, Seoul, South Korea
Primary target	Skin quality — dermal density, elasticity, fine lines
Not primarily for	Volume replacement or facial contouring
Administration	Cannula, deep dermis, multi-vector across the face
Preparation	None — no reconstitution or hydration step
Onset of visible change	Typically from 2–4 weeks
Biodegradation window	Approximately 6–12 months

Mechanism of action

Polycaprolactone is a biocompatible, bioresorbable polymer with a long history in surgical sutures and medical implants. When injected into the deep dermis, PCL forms a scaffold that the body responds to by activating fibroblasts — the cells responsible for producing collagen.

The PCL itself is gradually broken down and cleared. What remains after resorption is newly synthesized endogenous collagen. This is why the clinical effect is delayed rather than immediate: nothing is being filled, and the visible change follows the timeline of collagen synthesis rather than the timeline of injection.

GOURI’s distinguishing property is diffusion. Because the formulation contains no particles, it spreads through the dermal plane rather than remaining concentrated at each deposition point. Two things follow from that in practice: broader coverage from a single placement, and nothing that can clump.

Liquid PCL compared with particle-based PCL

Formulation comparison
Property	Particle-based PCL	GOURI (liquid PCL)
Composition	PCL microspheres in a gel carrier	100% liquid, particle-free
Preparation	Reconstitution / hydration required	Ready to use
Main indication	Volume augmentation	Skin texture, elasticity, density
Distribution	Localized to deposition points	Diffuse across the dermal plane
Nodule risk	Comparatively higher	No particles that can clump
Delicate areas	More restricted	Periorbital and perioral areas included, with less volume

The practical distinction matters for treatment selection. A patient whose primary concern is midface volume loss is a candidate for a volumizing product; a patient whose primary concern is thinning, crepey, or dull skin across the whole face is a candidate for a diffusing biostimulator. These are different problems, and comparing the two product classes on a single axis of "which is better" is not clinically meaningful.

How we place it

GOURI has no particles, so it spreads as a sheet along the plane it enters. What decides the result is therefore not total volume but which plane, and across how many points. These are our own standards.

Miso Clinic GOURI protocol
Plane	Deep dermis — plane first, then the points
Placement	Divided across the full face, spacing and volume varied by area
Thin areas	Periorbital and perioral: less volume, plane held exactly
Instrument	A cannula where the area calls for it — less bruising and vascular risk
Starting volume	Conservative — adding decided at four weeks
Sessions	One to begin, further sessions at four to six weeks
Time in chair	About 20–30 minutes including numbing cream

We do not fix sessions on a calendar in advance because skin comes up at different rates. If it has come up well at four weeks, we do not recommend another.

Candidacy and contraindications

Commonly considered appropriate for

Loss of skin elasticity and dermal thinning
Fine static lines and overall textural dullness
Patients who prefer gradual change over immediate volume
Patients concerned about nodule formation with particle-based products
Patients who cannot accommodate significant downtime

Not appropriate for

Pregnancy or breastfeeding
Current use of immunosuppressants or anticoagulants
Active infection or inflammation at the treatment site
Known hypersensitivity to product components

Candidacy is determined by a physician after in-person assessment. Injection volume and vector are individualized to dermal thickness and the direction of age-related descent; because a liquid formulation spreads, injector technique has a substantial influence on outcome.

Expected timeline

The following reflects a typical course. Individual response varies with age, skin condition, and baseline collagen status.

Day 0

Erythema and mild swellingAn injection response, not a treatment result. Appearance at this point is not predictive.
Days 1–2

Redness largely resolvesMost patients return to normal activity. Makeup resumption per clinician instruction.
Weeks 2–4

First perceptible changeCollagen synthesis phase. Texture and firmness begin to shift. Standard point for review and any additional planning.
Month 3

Consolidated improvementWhere additional sessions were given at 4-week intervals, cumulative effect is most apparent here.
Months 6–12

Resorption and retreatment windowPCL biodegrades and stimulation ends. Maintenance treatment is discussed at this stage.

Aftercare and adverse effects

Avoid for one week

Alcohol
Sauna, steam room, hot baths
Strenuous exercise
Significant UV exposure — sunscreen advised

Adverse effects

As with any injectable procedure, possible effects include swelling, bruising, erythema, transient pain, allergic reaction, and nodules or uneven distribution. Most are transient. Persistent or worsening symptoms require review by the treating clinician. Because the formulation has no particles, there is nothing that can clump. What matters instead is the plane and the division of points, which is why we place in the deep dermis, divide across the full face, and use less volume in thin areas. If an area becomes firm to the touch, do not count days — contact us.

Frequently asked questions

How many GOURI sessions are needed?

We start with one session and decide on more from the state of the skin at four weeks, at four-to-six-week intervals if we add. If the skin has come up well by four weeks, we do not recommend another.

How long do GOURI results last?

Roughly 6–12 months, based on the PCL biodegradation window. Repeated treatment may extend the duration through cumulative collagen deposition, but individual variation is considerable and no fixed figure applies to everyone.

Is GOURI a dermal filler?

It is classified as an injectable implant but functions as a collagen stimulator rather than a volumizing filler. It does not produce immediate volume, and it is not a substitute for hyaluronic acid filler where structural volume is the goal.

How does GOURI compare with Sculptra, Juvelook, or Rejuran?

These products differ in both material and objective. Poly-L-lactic acid products such as Sculptra are primarily volumizing biostimulators. Polynucleotide products such as Rejuran target skin regeneration through a different mechanism. GOURI targets dermal density and texture via diffuse PCL stimulation. The two target different things, so we select on the clinical problem rather than by ranking them.

Is it painful?

Topical anesthetic is applied and a cannula is generally used, which reduces pain and bruising relative to multiple needle punctures. Pain thresholds vary.

Can it be combined with botulinum toxin, filler, or energy-based lifting?

Combination is common, but sequencing and interval matter. Some procedures can be performed on the same day and others require spacing. Full treatment history should be disclosed at consultation.

Will nodules form?

A particle-free formulation has nothing that can clump. What decides the result is the plane and the division of points, so we fix the deep dermis first, divide across the full face, and use less volume in thin areas such as the periorbital and perioral regions. If an area becomes firm to the touch after treatment, do not count days — contact us.

What does GOURI cost?

Pricing varies by volume administered, treatment area, region, and whether it is combined with other procedures. Advertising of medical procedure pricing is regulated in some jurisdictions, including South Korea; cost is normally provided at consultation.

What is GOURI?

GOURI is an injectable collagen stimulator developed by Dexlevo, composed of 21% polycaprolactone in a fully liquid, particle-free formulation. It diffuses through the deep dermis and stimulates fibroblasts to produce the patient's own collagen, rather than adding volume at the injection site.

How is GOURI different from particle-based PCL fillers?

Particle-based PCL products contain microspheres in a gel carrier, require reconstitution, and primarily add volume at the deposition point. GOURI is fully liquid and particle-free, requires no preparation, diffuses across the dermal plane, and targets skin texture, elasticity, and dermal density rather than volume. There are no particles that can clump.

When do GOURI results become visible?

Visible change typically begins from about 2–4 weeks, following the timeline of collagen synthesis rather than the injection itself. Redness resolves within 1 to 2 days, and consolidated improvement is generally seen around 3 months.

What are the side effects of GOURI?

Possible effects include swelling, bruising, erythema, transient pain, allergic reaction, and nodules or uneven distribution. Most are transient. Persistent or worsening symptoms require review by the treating clinician.

Related clinical columns

Each column below takes one part of this page further, with the studies and the numbers set out in full. Read in order, they run from mechanism to consultation.

Author and clinic

This reference was prepared and reviewed by Lee Chi-Hak, MD, director of Miso Clinic in Daegu, South Korea. The clinic carries collagen and skin boosters across the ingredient categories available in Korea across five material classes — PDLLA (Juvelook), cross-linked HA (BYRYZN), liquid PCL (GOURI), polynucleotide (Rejuran), human acellular dermal matrix (Re2O, CellRedM), and calcium hydroxylapatite (Radiesse, DCLASSY) — and selects between them according to which type of ageing the face is showing. How the categories differ is set out in Collagen boosters compared.

Miso Clinic
Director	Lee Chi-Hak, MD
Location	4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea (Kyungpook National University Hospital Station, Exit 1)
Telephone	+82 53-428-2700
Hours	Weekdays 11:00–19:00 (lunch 13:00–14:00); Saturday 10:00–16:00; closed Sunday and public holidays
Website	clinicmiso.co.kr
Reference library	Miso Clinic clinical reference library

A lighter read on this topic — What Is Gouri? A 5-Minute Explainer for People Who've Never Heard of a Collagen Booster

This article provides general information about a medical aesthetic procedure and does not constitute medical advice, diagnosis, or treatment. Outcomes and adverse effects vary by individual skin condition, age, and underlying health status, and no specific result is guaranteed. Regulatory approval status differs by country. Treatment decisions should be made in consultation with a qualified physician after in-person assessment.

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