Skin Boosters in Korea: Rejuran, Profhilo, and What 'Injectable Glow' Really Means
These aren't fillers. They don't add shape — they change the quality of the skin itself.
Skin boosters are injectable treatments that improve the quality of the skin — hydration, texture, elasticity, firmness — rather than adding volume or shape the way dermal fillers do. The common ones work differently: Rejuran uses polynucleotides (from purified salmon DNA) to support skin repair; the PDLLA family (Juvelook, and its export name Lenisna) stimulates collagen; Profhilo is a stabilised hyaluronic acid that hydrates and bio-remodels. Most are a short course — typically two to four sessions a few weeks apart — with results lasting several months to over a year depending on the product, and maintenance thereafter. Amounts and timing vary by person; your clinic advises.
If you’ve read anything about Korean skincare treatments, you’ve met the word glow — usually attached to a list of product names that all sound similar and all promise the same luminous result. It’s worth cutting through that, because these treatments are genuinely useful, and they’re genuinely different from one another.
Here’s the first and most important distinction.
What is a skin booster, really?
A skin booster is an injectable that improves the quality of your skin — its hydration, texture, elasticity, and firmness — rather than its shape.
That’s the line that matters. A dermal filler is placed in one spot to add volume or contour: a cheek, a chin, a fold. A skin booster is spread through an area to make the skin itself better — more hydrated, smoother, more resilient. Fillers change structure; boosters change quality. They’re often used together, but they’re not the same tool, and knowing which one your goal actually calls for saves a lot of confusion.
This is treatment that works below the surface, which is exactly why it anchors our Refresh curation and the Skin boosters & glow service — skin that looks well, not done.
How do the main ones differ?
The names blur together in marketing, but the active ingredients don’t. Three families cover most of what you’ll be offered.
Rejuran — polynucleotides (PN). Derived from purified salmon DNA, Rejuran is used to support the skin’s own repair processes — texture, elasticity, fine lines, and hydration. It’s typically a course of around three to four sessions, a few weeks apart, with results from a course often lasting four to six months before maintenance.
The PDLLA family — Juvelook, and its export name Lenisna. Worth clearing up, because they’re marketed as if separate: Lenisna is the international name for the Juvelook line — the same PDLLA (poly-D,L-lactic acid) product family, not two rival innovations. PDLLA is a collagen stimulator, often blended with hyaluronic acid, that acts as a scaffold prompting your own collagen over months. Usually two to three sessions, with longevity commonly cited at around a year to eighteen months.
Profhilo — stabilised hyaluronic acid. Not a volumiser: it’s a “bio-remodelling” treatment that spreads to deeply hydrate and improve firmness and elasticity. The standard protocol is two sessions, four weeks apart, with results around six months and periodic maintenance.
There’s also the broad category of plain skin-booster / mesotherapy HA — micro-injections of hyaluronic acid, sometimes with vitamins or antioxidants, for hydration and glow over a few months.
Why is it almost always a course, not one session?
Because the point of this category is accumulation, not a single dramatic change.
Boosters work by nudging your skin to repair, hydrate, and build collagen — and that happens gradually. A first session primes; the following ones build on it. This is why nearly every one of these treatments is prescribed as a short course spaced a few weeks apart, and why a “one and done” expectation is the wrong frame. If you want to see a real difference, plan for the course, then maintain it.
It’s also why these fit a Korea trip so gracefully: most sessions have little to no downtime, so they slot around the rest of your visit. If your stay is short, a clinic can often begin the course here and advise on continuing it — something we help sequence in How Many Days Should You Stay in Korea for Treatment?
The honest expectation
Skin boosters won’t reshape your face, and they won’t transform your skin overnight. What they do — quietly, over a course — is make skin look healthier, more hydrated, and more rested. Understood that way, they’re one of the most satisfying things in Korean aesthetics, and among the easiest to fit into a trip.
Which booster suits your skin, whether you need one at all, and how to sequence a course around a short visit — those are exactly the questions we’re glad to talk through with you, among the clinics we know from the inside.
Related reading
Frequently asked
What is a skin booster, and how is it different from filler?
A skin booster is injected to improve the quality of the skin — hydration, texture, elasticity, and firmness — spread across an area rather than placed to add shape. A dermal filler does the opposite: it adds volume or contour in a specific spot. Boosters make skin look healthier and more rested; fillers change structure. They're often used together, but they do different jobs.
What's the difference between Rejuran, Juvelook, and Profhilo?
They use different active ingredients. Rejuran is polynucleotide (from purified salmon DNA), used to support skin repair, texture, and elasticity. Juvelook — sold internationally as Lenisna — is PDLLA, a collagen stimulator often blended with hyaluronic acid; the two names are the same product family. Profhilo is a stabilised hyaluronic acid that deeply hydrates and 'bio-remodels' firmness. Which suits you depends on your skin and goal, and your clinic advises.
How many skin booster sessions do I need?
Usually a short course, not a single visit. Rejuran is commonly around three to four sessions a few weeks apart; Profhilo is typically two sessions four weeks apart; the PDLLA products are often two to three sessions. Results build over the course rather than appearing all at once, and maintenance is periodic. Exact numbers vary per person — treat these as typical ranges.
How long do skin booster results last?
It depends on the product. A course of Rejuran often lasts around four to six months; Profhilo results are commonly cited at about six months; the collagen-stimulating PDLLA products can last roughly a year to eighteen months. These are ranges that vary with your skin and lifestyle, and most people maintain results with periodic top-ups rather than a one-time treatment.
Wondering which clinic would be right for you?
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