Rejuran in Seoul: The Ampoule and the Injection Differ

"I've been using a Rejuran ampoule at home for months. Is the injection in Seoul actually different, or am I paying for the same thing?"

It is a question we hear often from people planning a trip to Seoul, and with the same name on both, it is a fair one. The answer is yes, they differ — but not because one is a better version of the ingredient. It comes down to how far into the skin each one reaches. Here is that structure, starting from the skin itself.

What Is the Difference Between the Rejuran Ampoule and the Rejuran Injection?

They reach different layers of the skin.

Skin is built in layers, with the epidermis on the outside and the dermis beneath it. The outermost part of the epidermis is a barrier that stops outside substances passing through freely. That barrier is essential to how skin works, and topical products are formulated on the assumption that it is there.

The Rejuran injection passes that layer and places the ingredient directly into the dermis. The dermis is the layer that produces skin's firmness and thickness. What the injection does is put PN into that layer — and that is precisely the part a topical product cannot do.

Put the other way round, the injection covers what a topical product cannot reach, which is not the same as saying a topical product is pointless. Surface hydration and barrier condition belong to daily skincare, and the injection does not take that over.

What Does the Rejuran Injection Do Inside the Skin?

It signals rather than fills.

Rejuran's main ingredient, PN (polynucleotide), is a DNA fragment obtained from salmon. Once it sits in the dermis, it is understood to signal the cells that produce collagen to repair and rebuild. The manufacturer is PharmaResearch, a Korean company, and the product is classified in Korea as a PN-based medical device.

This is where a common misunderstanding splits off. Rejuran is not a volumizing injection. It does not fill a hollow or build contour. It works on raising the skin's own capacity to recover where it has thinned and lost elasticity, which is also why the change does not show the moment it goes in but appears over time.

Straight after the injection, the treated points can rise into small bumps, much like a mosquito bite. The ingredient stays in one place in the dermis and pushes against the surrounding tissue, and it takes time to settle. Bruising, or a temporary firm lump, can also occur.

We plan your flight home with you in the consultation. How long injection marks and raised bumps stay visible depends on your skin and the amount injected, so tell us your departure date and we can advise you around that schedule.

Do I Still Need My Ampoule After a Rejuran Injection?

Yes. They cover different ground.

What a topical product works on is the condition of the skin's surface: how well moisture is held, and how intact the barrier is. When that barrier is compromised, skin feels tight, looks red, and reacts easily to irritation — and that is not a problem solved by putting something into the dermis.

Thinning skin and loss of elasticity, on the other hand, are changes in the dermis. However carefully you look after the surface, that care does not reach the layer underneath.

So rather than choosing one over the other, it is more realistic to divide the work between them. After you have had the injection in Seoul and flown home, carry on with your daily routine as before.

That said, do not expect the same result from a topical product just because the ingredient name on the label matches. The same name delivered to a different depth produces a different outcome.

What If Needles Are What Is Keeping You on the Ampoule?

There is a choice on the injection side too.

What keeps someone on an ampoule is often not a judgment about ingredients but the needle itself. That is not unusual. In an international survey of 2,098 adults from the general population, 63.2% reported a fear of needles, with an average intensity of 5.7 out of 10. The solutions they pointed to most often were non-invasive alternatives (94.1%) and thinner needles (91.1%) ⁽¹⁾.

Rejuran is injected by hand as standard. On top of that, you can add the Cooling Low Pain X-Injector as an option. It is not a treatment but an injection device: the syringe holding the product is loaded into the unit, and the unit drives it. In Korea it is classified as a motorized medicinal injection pump. The manufacturer is SKINX.

There are three reasons we suggest this option to people who find needles difficult.

1. The sting as the needles go in is considerably reduced The plate the needles come through is chilled before it is placed against the skin. Heat leaves through the contact surface, so the surface temperature drops (contact cooling), and a cooler surface is understood to dull sensation. That is the "cooling" in the name. The needles themselves are several very fine needles set into that plate (multi-needle), so it does not feel like one deep puncture. They are sterile, single-use, and supplied separately from the device.

2. A set amount goes evenly into multiple points Instead of the doctor pressing the syringe by hand, the device pushes the product through in a set amount at a time. Because it enters through several needles in the plate at once, there is less variation between points — less pooling in one spot, and less chance of another receiving too little.

3. Less of the product leaks back out With a product as viscous as Rejuran, some of it can come back out through the entry point when it is injected by hand. Because the device dispenses a set amount at a steady rate, that loss is smaller. For the same volume, it changes how much of the product actually stays in the skin.

This option does not add numbing or any extra waiting time.

Two things are worth being clear about, though.

It is not painless. What the cooling addresses is sensation at the surface of the skin. The heavy, pressing sensation as the product enters remains.

The device does not decide the result or how long it lasts. Putting Rejuran in with the X-Injector does not change what PN does in the dermis. That is set by the product going in; what the device handles is only how it goes in.

It is a separate option rather than part of the base treatment price, so there is an added cost. And where the depth needs adjusting finely from one area to the next, we also consider having the doctor control the syringe directly. Which of the two suits you is decided in the consultation, based on the area being treated and how sensitive you are to pain. Numbing is part of the same conversation.

How Do I Know the Rejuran Is Authentic?

Watch it being opened, and take the certificate with you.

This is the thing patients from abroad check most often. At Peche Clinic, we prepare the product in front of you right before treatment, so you can read the product name and the volume yourself. The point of that step is to make sure treatment never ends with you not knowing what was used.

Rejuran is a product that comes with an authenticity certificate. We hand you the certificate after treatment, and there is a record of which product was used, where, and how much. You also receive an itemized payment receipt afterwards.

There are two things to check in a consultation — whether they show you the product being opened, and whether a record is kept. A clinic that answers both specifically is one that works to a standard on product handling.

What to Prepare Before a Rejuran Consultation in Seoul

Having these four things ready makes the consultation go quickly.

1. Tell us what you are using now Knowing which products you use at home, and how, makes it easier to separate what the injection should handle from what daily skincare should.

2. Sort your concerns into "surface" and "deeper" Tightness, redness, and reacting easily to irritation are surface. Feeling thinner and less elastic is deeper. That distinction is where the consultation starts.

3. Tell us about any injections you have had before A record of when, where, and how much was injected speeds up the assessment.

4. Send us your dates and your departure day We schedule treatment around the time injection marks and raised bumps take to settle. Tell us your schedule and we will advise you around it.

Peche Clinic is a one-minute walk from Exit 4 of Gangnam Station, served by subway Line 2 and the Shinbundang Line. We are open until 9 PM on weekdays and 6 PM on weekends and public holidays. Payment is by card on the day of treatment. English-speaking staff are on site, so you can be understood directly in your own language, and questions and bookings before your visit come to us on WhatsApp. Our consultations draw on the experience of over 90,000 treatments.

→ 6 Things to Check Before Booking a Skin Clinic in Seoul

FAQ

Q: Will using the ampoule consistently give me the same effect as the injection? A: It is unlikely to give the same result. A topical product is limited by the skin barrier in how far it can travel, while the injection passes that layer and places the ingredient directly into the dermis. Reaching a different layer means doing a different job. That said, surface hydration and barrier care belong to the topical side, so the two are not interchangeable.

Q: Does the Rejuran injection add volume? A: No. Rejuran is not a filler. It is understood to signal skin that has thinned and lost elasticity to repair itself. If filling a hollow or building contour is your concern, we look at other approaches alongside it.

Q: When will I start to notice the effect of Rejuran? A: It shows over time rather than immediately after the injection. Because it works by signaling the cells that produce collagen, the change takes time to build. Many patients notice it after they have flown home from Seoul.

Q: The injection sites rose into bumps — is that normal? A: That shape comes from the ingredient staying in one place in the dermis and pushing against the surrounding tissue, and it settles over time. Bruising or a temporary firm lump can occur alongside it. How quickly it settles varies from person to person, so it is worth asking about in the consultation beforehand.

Q: Needles put me off, so I have only used topical products. Is there an option on the injection side? A: There is. Rejuran is injected by hand as standard, and you can add the Cooling Low Pain X-Injector as an option. The plate the needles come through is chilled, which is understood to dull sensation at the surface, so the sting is considerably reduced — and the needles are several very fine ones set into that plate. Because it dispenses a set amount at a time, the product goes evenly into multiple points and less of it leaks back out. It is not painless, though: the heavy, pressing sensation as the product enters remains, and the result and how long it lasts are set by the product rather than the device. It is a separate option rather than part of the base treatment price.

Q: Can I confirm the Rejuran is authentic? A: At Peche Clinic we prepare the product in front of you right before treatment, so you can read the product name and the volume yourself. Rejuran comes with an authenticity certificate, so we hand you the certificate after treatment, and there is a record of which product was used, where, and how much.

Q: How is Rejuran different from other skin boosters? A: Skin boosters — injectable treatments aimed at the quality of the skin itself — divide into several families depending on what is injected, and Rejuran is the family that is understood to signal the skin to repair itself. What each family targets, and when you notice it, differ. Which family suits which concern is something to work through in the consultation, starting from what you want to change.

Q: Can I fly home right after the Rejuran treatment? A: How long injection marks and raised bumps stay visible depends on your skin and the amount injected. Send us your departure date and the treatment you are considering on WhatsApp, and we can advise you around that schedule.