How does GOURI differ from Rejuran?

GOURI is liquid PCL: it diffuses through the dermis and stimulates fibroblasts to produce collagen. Rejuran is a polynucleotide derived from salmon DNA and works by improving the skin's regenerative environment rather than stimulating collagen directly; it is used mainly for thin, reactive skin.

What is the difference between hADM and PCL products?

PCL induces collagen, so change appears slowly and lasts. hADM products such as Re2O and CellRedM supply extracellular matrix components directly to the dermis, so density change appears relatively early.

When is a CaHA product chosen?

CaHA products such as Radiesse and DCLASSY add volume immediately while also stimulating collagen production. They are chosen when lost volume has to be addressed alongside skin quality.

What do collagen boosters not fix?

Deep set creases and scars, significant laxity, and pigment or erythema are outside their scope. Each requires a different treatment or a combined plan.

Can several products be combined?

Combination is common, but sequence and interval matter. Some combinations can be done in one session and others must be spaced, so a full history of previous treatments is needed at consultation.

Miso Clinic · Clinical Reference

Six collagen boosters compared: which one fits which skin

GOURI, Rejuran, Re2O, CellRedM, Radiesse and DCLASSY sound interchangeable, but they differ in material and mechanism, and therefore in the problem they solve. None of them is better than the others in the abstract — each has a skin it suits. This reference sets out how to tell which is which.

Reference article Reading time ~9 min Reviewed 2026 Miso Clinic · Daegu, Korea 한국어판

The question that comes before the product

The first thing to establish is not which product, but which kind of ageing the face is showing. There are broadly two. One is volume loss, driven by changes in fat and bone. The other is thinning of the skin itself, driven by loss of dermal collagen. The causes differ, so the treatments differ. Adding volume to skin that has thinned lifts the hollows but leaves the thinness in place — the result reads as slightly off, and it does not hold.

Many patients arrive having already chosen a product: a name from an advertisement, a treatment a friend had, something well reviewed. But there is no guarantee that their face and yours are undergoing the same change. The right product in the wrong skin either does nothing or looks wrong.

Four material classes

Dozens of product names are on the market, but by material they fall into four classes. Knowing the class makes the names much less confusing.

Material classes and how they work
Class	What it is	How it works
PCL	Polycaprolactone, a biodegradable polymer long used in sutures	Forms a scaffold in the dermis that stimulates fibroblasts to produce new collagen
PN	Polynucleotide, extracted from salmon DNA	Rather than stimulating collagen directly, it improves the skin's regenerative environment
hADM	Human acellular dermal matrix	Supplies ECM components directly to the dermis — replacing rather than inducing
CaHA	Calcium hydroxylapatite	Adds volume immediately while also stimulating collagen production

One distinction matters more than the rest. PCL and PN induce; hADM replaces; CaHA does both. What is induced appears slowly and lasts. What is replaced appears sooner. That property is what the choice turns on.

The six, side by side

Collagen boosters available at Miso Clinic
Product	Class	Primary target	Onset
GOURI	Liquid PCL	Whole-face texture, elasticity, dermal density	Gradual, from 2–4 weeks
Rejuran	PN	Regenerative environment of thin, reactive skin	2–4 weeks, cumulative
Re2O	hADM	Direct supplementation of dermal density	Relatively early
CellRedM	hADM, ultrafine	Density in thin or reactive areas	Relatively early
Radiesse	CaHA	Lost volume plus collagen stimulation	Immediate, then cumulative
DCLASSY	CaHA	Elasticity and volume together	Immediate, then cumulative

The table alone still does not decide it. In practice the consultation does not start from the product — it starts from the complaint.

Starting from the complaint

"My skin has thinned"

PCL or PNFine lines that have settled in, enlarged pores, a dull overall tone — these follow dermal thinning. For even treatment across the whole face, liquid PCL (GOURI); for skin that is particularly thin and reactive, PN (Rejuran).
"It's the eye and mouth area"

Liquid PCL or ultrafine hADMThin, sensitive territory. A freely diffusing liquid formulation (GOURI) or a low-resistance ultrafine particle (CellRedM) is less burdensome here.
"I want to see it soon"

hADM or CaHAInducing collagen takes time. hADM (Re2O), which supplements density directly, and CaHA, which sets volume immediately, are felt sooner. Note, though, that fast and long-lasting generally pull in opposite directions.
"There are hollows"

CaHAIf the problem is volume, a collagen booster alone will not solve it. Radiesse or DCLASSY, which address volume and collagen together, or a combination with filler, is the discussion to have.
"I can't take downtime"

Particle-free or fine-particle optionsLiquid PCL causes little foreign-body sensation and redness usually settles within 1–2 days. No injectable is flawless on the day, however; allow 2–3 days before anything important.
"I don't know what the problem is"

Assessment comes firstThis is the most common answer, and the most reasonable one. Volume loss and dermal thinning are hard to tell apart in a mirror. Coming in for that judgement is more useful than coming in with a product already chosen.

Can they be combined?

Frequently, because skin quality and volume often both need attention. What matters is sequence and interval. Some combinations can be done in one session; others need to be spaced. The same applies to combining with lasers or energy-based lifting devices.

For that reason, a full history of previous treatments matters at consultation — particularly recent filler or botulinum toxin. An incomplete history produces a flawed plan.

What these treatments do not fix

Collagen boosters are not a general solution. It is better to know this before the consultation.

Deep set creases and scars — raising dermal density and filling an indentation are different tasks.
Significant laxity — lifting descended tissue belongs to lifting procedures. Boosters work on the foundation beneath.
Pigment and erythema — problems of colour are addressed by laser-based treatment.
Immediate change — PCL and PN follow the pace of collagen synthesis. The face the day after treatment is not the result.

Where the complaint falls into one of these, we either advise against a booster or plan it alongside something else. Deciding to do less is part of the consultation.

Adverse effects — As with any injectable, swelling, bruising, erythema, transient pain, allergic reaction, and nodules or uneven distribution are possible. The risk profile differs by material class; particle-containing formulations carry comparatively greater nodule risk. Persistent or worsening symptoms require review by the treating clinician.

Frequently asked questions

Which collagen booster is the best?

No product holds that position, because each material solves a different problem. Liquid PCL will not restore lost volume however much is used, and filling volume in skin that has thinned looks wrong. The question is not which product is best but which fits the face in front of you.

Does it matter whether a clinic carries several products or only one?

Having options makes it possible to conclude that a given treatment is not the right one. That judgement is harder to reach with a single product on the shelf. That said, breadth of stock does not by itself produce better results — assessment and planning do.

Can I request a specific product I read about?

Yes, though we will first discuss why you want it. Sometimes the person whose review you read is undergoing the same kind of ageing; sometimes not. If we judge it unsuitable we explain why, and if you still wish to proceed we set out the limitations before you decide.

How many sessions are needed?

It depends on the product and the skin. Some plans are a single session; others group two or three at 4–6 week intervals. We do not ask for a multi-session commitment up front — typically we review at 2–4 weeks after the first session and decide from there.

How long do results last?

It varies by class. For PCL, roughly 6–12 months, based on the biodegradation window. Repeated treatment may extend this through cumulative collagen deposition, with considerable individual variation. The most reliable way to extend any of it is sun protection.

What does it cost?

It depends on the product, the volume injected, the area planned, and whether treatments are combined. Public listing of medical procedure pricing is regulated in some jurisdictions, including South Korea; cost is provided at 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 all six of the products above and plans treatment by first assessing which kind of ageing the face is showing, rather than starting from a chosen product. For a single-product reference, see the GOURI (liquid PCL) article.

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
Korean version	콜라겐 부스터 6종 비교

This article provides general information about medical procedures and does not replace medical diagnosis or treatment. Product characteristics described here are generally reported properties; whether any given treatment is appropriate for an individual can only be determined in person. Effects and adverse effects vary with skin condition, age and underlying illness, and no outcome is guaranteed for any individual.