GOURI, Rejuran, Re2O and Juvelook — choosing backwards from the goal
“Which booster is best” has no answer, because they aim at different things. So we reverse the order — settle the goal first, then choose the class that matches it. Once the goal is set, the product largely follows.
The short answer
Collagen boosters are not competing products so much as products aimed at different things. So rather than “which is best”, the first question is “what is my goal”. If the goal is texture and density across the whole face, that is GOURI; immediate hydration, an HA booster; regeneration and texture, the Rejuran class. Once the goal is settled, the product largely follows.
The difference on one page
| Product (class) | Formulation | Usual plane | Mainly aimed at |
|---|---|---|---|
| GOURI (liquid PCL) | Particle-free liquid, water carrier | Deep dermis | Texture and density across the face — spreads as a sheet |
| Rejuran (PN) | Injectable solution | Dermis | Skin regeneration and texture |
| Juvelook (PDLLA) | Particles in a carrier | Dermis, subcutis | Dermal stimulation with some volume |
| Re2O (hADM) | Injectable solution | Dermis | Dermal support |
| HA boosters | Gel or solution | Dermis | Immediate hydration |
Read the table across rather than down. It is not a ranking — these are products doing different jobs.
Choosing backwards from the goal
| If this is the goal | The direction that fits |
|---|---|
| The whole face looks dull, texture has coarsened | GOURI — where a sheet-spreading formulation pays off most |
| Skin has thinned and no longer catches light | GOURI — it targets dermal density |
| Dryness and tightness come first | An HA booster gets there faster |
| Weighting toward regeneration | The Rejuran (PN) class |
| Some volume wanted alongside | A particle class such as Juvelook (PDLLA) |
| Lost volume is the main issue | A filling material — not a booster's job |
| Laxity is the main issue | RF, ultrasound or threads — a different layer |
What sets GOURI apart — having no particles
There is one property in that table that only GOURI has: no particles, and water as the carrier.
- It spreads as a sheet. Rather than filling points, it covers along the plane it enters — which suits lifting the texture of the whole face evenly.
- Nothing that can clump. Particularly useful in thin skin.
- No reconstitution. Nothing to mix and wait for.
- In exchange, plane and division matter. Because it spreads, which plane and how many points decide the result.
The injection design is in what spreading evenly actually means, and the mechanism in how GOURI builds collagen.
The four steps we use to choose
- Establish what has gone. The weighting of skin quality, volume and laxity, area by area. It is common for a booster to drop out entirely here.
- Put the goal into one sentence. “Better overall” cannot be judged afterwards.
- Choose the class that matches that goal. The goal table above is this step.
- Check reversibility and what is already in place. A material with no reversal injection in the same area changes the design above it.
Reverse the order and you end up choosing the product first and fitting the goal to it — which leaves nothing to judge the result against.
Can they be combined
Yes, but staggered. Placed on the same day, there is no way to tell which produced which response. We place one, review at four weeks, and settle the combination from there.
Combinations often make sense — texture with GOURI, immediate hydration with an HA booster, for instance. Because they aim at different things, they do not substitute for each other.
How we judge it at Miso Clinic
- The goal comes before the product. Settle the goal and the class largely follows.
- We do not rank them. Products aimed at different things cannot be put in a single line.
- Materials with no reversal injection start conservatively — GOURI, Juvelook, PLLA and CaHA among them.
- Combinations are staggered. One first, judged at four weeks.
- We do not disparage other clinics' work.
What to settle at a consultation is in seven things to settle first.
Frequently asked questions
Which is better, GOURI or Rejuran?
They aim at different things. GOURI treats texture and density across the whole face as a sheet; Rejuran weights toward regeneration and texture. If the goal is “dull overall, texture coarsened”, that is GOURI; if it is regeneration, Rejuran.
What makes GOURI different from other boosters?
No particles, and water as the carrier. So it does not fill points — it spreads as a sheet along the plane it enters. That suits lifting the texture of the whole face evenly, and it needs no reconstitution.
Can I have several of them together?
Yes, but staggered. On the same day there is no way to tell which produced which response. We place one, review at four weeks, and settle the combination from there.
Is there one that adds volume too?
Particle classes such as Juvelook (PDLLA) aim at some volume alongside. If lost volume is the main issue, though, that is a filling material's job rather than a booster's.
Can I come having already chosen a product?
You can, but we take the order back a step. We establish what has gone, put the goal into a sentence, then choose the class — so that there is something to judge the result against afterwards.
Which of these can be reversed?
HA products can be dissolved with hyaluronidase. GOURI, Juvelook, PLLA and CaHA have no reversal injection, which is why we start conservatively with those and decide at four weeks whether to add.
Can I just choose on price?
We do not discuss treatment prices in these columns. What we will say is that products aimed at different things are hard to price against each other. A product that does not match the goal gives a result that does not match the goal, whatever it costs.
Product page
The product itself is set out here. GOURI: liquid polycaprolactone as a collagen stimulator
Who wrote this
Written and reviewed by Lee Chi-Hak, MD, director of Miso Clinic, Daegu. The treatment standards and injection design set out here are the ones we use in practice.
| Medical director | Lee Chi-Hak, MD |
|---|---|
| Address | 4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu, South Korea · Exit 1, Kyungpook National University Hospital Station |
| Phone | +82-53-428-2700 |
| Hours | Weekdays 11:00–19:00 (lunch 13:00–14:00) / Saturday 10:00–16:00 (no lunch break) / Closed Sundays and public holidays |
| Columns | All clinical columns |
| Reference library | All booster and device references |
Everything in this column is general information and does not replace medical diagnosis or treatment. Effects and side effects vary with individual skin condition, age and underlying illness, and the same result is not guaranteed for everyone. Any decision to proceed should be made in an in-person consultation with a physician.
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