What Is a Korean Skin Booster? How Injectables Like Rejuran and Juvelook Actually Work

Short answer: A Korean skin booster is a series of tiny, shallow injections that place a regenerative or hydrating substance directly into the skin. Unlike filler, the goal is not to add volume but to improve overall skin quality: thickness, elasticity, texture, pores and glow. Rejuran works by delivering polynucleotides (PN) that support skin repair, while Juvelook uses PDLLA microparticles plus hyaluronic acid to gradually stimulate your own collagen. In Gangnam, Rejuran Healer typically costs about ₩150,000–₩400,000 per session and Juvelook about ₩300,000–₩800,000 (2026 ranges).

What exactly is a skin booster?

"Skin booster" is an umbrella term rather than a single product. It covers any injectable that is placed in the upper layer of the skin (the dermis) in many small, evenly spaced points across the face. Because the product is spread thinly instead of concentrated in one spot, it changes how the skin itself behaves rather than changing the shape of the face.

Korean clinics popularised skin boosters for three reasons: Korean manufacturers developed many of the best-known products, patients in Korea prioritise "glass skin" quality over dramatic volume, and the treatments fit neatly into short visits with little downtime. That is why they are among the most requested treatments for international visitors in Gangnam.

Skin boosters vs dermal fillers

• Depth: boosters sit superficially in the dermis; fillers are usually placed deeper, under the skin or near the bone.
• Purpose: boosters improve texture, hydration and firmness; fillers restore or add volume and change contours.
• Technique: boosters use dozens to hundreds of micro-injections across the face; fillers use a few targeted injection points.
• Result: boosters look like "better skin", not a different face, which is why many people combine both.

How Rejuran works

Rejuran is a Korean injectable made from polynucleotides (PN), DNA fragments purified from salmon. PN is thought to support the skin's natural repair environment, which is why Rejuran is usually chosen for thin, tired, sensitised or post-acne skin. Results build gradually and are often described as thicker, calmer, more resilient skin with finer texture.

There are several versions designed for different jobs:

• Rejuran Healer: the original full-face formula for overall skin quality.
• Rejuran Eye: a gentler formula for thin under-eye skin and fine crepey lines.
• Rejuran S: a denser formula used for depressed acne scars.

Typical course: about 3 sessions spaced 2–4 weeks apart, with results commonly lasting 6–12 months. Expect small raised bumps for 1–2 days, and note that Rejuran has a reputation as one of the more uncomfortable boosters, so numbing cream is standard.

How Juvelook works

Juvelook is a Korean collagen-stimulating booster that combines PDLLA (poly-D,L-lactic acid) microparticles with hyaluronic acid. The hyaluronic acid gives a little early hydration, while the PDLLA particles trigger a gradual collagen response over the following weeks. Because it builds structure, Juvelook is popular for enlarged pores, fine lines, shallow acne scars and early loss of firmness.

Typical course: 2–3 sessions about 4 weeks apart. Small bumps can last 1–3 days. Improvement is slow, usually becoming noticeable after several weeks, and results often last 12 months or more. A higher-concentration version, Juvelook Volume, is used where a little more structure is wanted.

Rejuran vs Juvelook at a glance

• Main ingredient: Rejuran uses polynucleotides (PN); Juvelook uses PDLLA plus hyaluronic acid.
• Main action: Rejuran focuses on repair, thickening and calming; Juvelook focuses on collagen stimulation and texture.
• Best for: Rejuran suits thin, sensitive, tired or damaged skin; Juvelook suits pores, fine lines, shallow scars and early loss of firmness.
• Usual course: Rejuran about 3 sessions 2–4 weeks apart; Juvelook 2–3 sessions about 4 weeks apart.
• Downtime: bumps for 1–2 days with Rejuran and 1–3 days with Juvelook.
• Results last: about 6–12 months for Rejuran and 12 months or more for Juvelook.
• Gangnam price (2026): Rejuran Healer ₩150,000–₩400,000 (about $110–$290); Juvelook ₩300,000–₩800,000 (about $210–$570) per session.

Prices are typical 2026 Gangnam planning ranges at about 1 USD = ₩1,400. See the full Rejuran Healer cost guide and Juvelook cost guide.

Other skin boosters you will see in Gangnam

• Hyaluronic acid boosters: products such as Skinvive and Profhilo focus mainly on hydration and glow, with quicker visible results. See our Water Glow injection guide.
• PDRN: a related salmon-DNA ingredient often used for recovery and redness-prone skin.
• Skin Botox (microbotox): very diluted toxin injected superficially to soften oil, pores and fine lines; often combined with boosters.

What happens during a treatment

1. Consultation: the doctor checks your skin, goals and medical history and recommends a product and number of sessions.
2. Numbing: anaesthetic cream is applied for about 30–40 minutes.
3. Injection: the product is placed by hand with a fine needle or with an injector device, usually taking 10–20 minutes.
4. Aftercare: a calming mask or LED may be applied. You can usually leave straight away.

Side effects and who should be careful

Common, temporary effects include small bumps, redness, mild swelling, pinpoint bleeding and occasional bruising. With collagen stimulators such as PDLLA, there is a small risk of lumps or nodules if the product is placed incorrectly, which is one reason to choose an experienced doctor.

Tell your doctor if you are pregnant or breastfeeding, have an active skin infection or flare, an autoimmune condition, a history of keloids, take blood thinners, or have a fish or salmon allergy (relevant to PN and PDRN products). Skin boosters are generally not done on skin with active inflammation.

Aftercare: the first 48 hours

• Avoid makeup for about 24 hours and do not rub or massage the treated area.
• Skip saunas, hot baths, intense exercise and alcohol for 1–2 days.
• Use gentle, fragrance-free skincare and daily sunscreen.
• Avoid strong actives such as retinoids and exfoliating acids for a few days unless your doctor advises otherwise.

Planning a skin booster trip to Seoul

Because downtime is short, skin boosters fit well into a 3-day Seoul beauty trip. The challenge is the course: Rejuran and Juvelook both work best as a series spaced weeks apart. Visitors who can only come once often do one session in Gangnam and continue with a similar product at home, or plan two trips. If you want visible glow before an event, ask about pairing a booster with laser toning as part of a glass skin plan.

Before booking, ask for an itemised written quote that states the product name, the amount (for example 2cc), whether numbing and VAT are included, and the doctor performing the injections. Our international patient guide covers coordinators, timing and travel.

Frequently asked questions

Are skin boosters the same as fillers?

No. Skin boosters are placed superficially to improve skin quality, while fillers are placed deeper to add volume or change shape.

Which is better, Rejuran or Juvelook?

Neither is better overall. Rejuran suits thin, sensitive or damaged skin that needs repair; Juvelook suits pores, fine lines and shallow scars where collagen building is the goal. Some clinics alternate or combine them.

How soon will I see results?

Hydration-type boosters can look better within days. Rejuran and Juvelook improve gradually, with the clearest change usually 4–8 weeks after a session and building further across the course.

Do skin boosters hurt?

There is some stinging even with numbing cream. Rejuran is often described as more uncomfortable than hyaluronic acid boosters. Most people tolerate it well.

Can I fly home the day after?

Usually yes. Bumps generally settle within 1–3 days and do not prevent flying, but ask your doctor about your specific treatment.

How much do skin boosters cost in Gangnam?

In 2026, Rejuran Healer typically costs ₩150,000–₩400,000 and Juvelook ₩300,000–₩800,000 per session, depending on dose, clinic and package.

This article is general information, not medical advice. Product suitability, dosing and results vary by person. Always consult a licensed doctor and get an itemised written quote before treatment. Prices are typical Gangnam planning ranges and change often. Updated October 2026.