PDRN Injection in Korea: A Serum Is Not a Skin Booster

The ingredient went viral. The injection did not change.

PDRN is now in serums from Korean brands and from global names that launched their own versions this year. In Seoul, the same word shows up on clinic price tiles, next to "salmon DNA," "Rejuran," and "skin booster." Visitors who bought a bottle at home message a Gangnam clinic asking for "the real PDRN." The coordinator books whatever the clinic stocks. Sometimes that is PDRN. Often it is PN.

If you remember one test, remember this. Ask for the product name and whether it is a drug or a medical device. If the answer is a brand you can look up, you know what you are getting. If the answer is "our PDRN," you are buying a word.

What does PDRN actually mean?

PDRN stands for polydeoxyribonucleotide. It is DNA, purified mainly from salmon or trout sperm cells, broken into fairly short fragments.^{2, 3} In the lab and in wound-healing studies, PDRN appears to act mostly by switching on the adenosine A2A receptor, a signal linked to calmer inflammation, new small blood vessels and tissue repair. Its broken-down pieces can also be recycled by cells as building blocks.^{2, 3}

PN, short for polynucleotide, is the same family with longer chains. Longer chains hold water and form a thicker gel, so PN behaves more like a scaffold in the skin than a signal.² That is why PN products are sold as skin boosters and even as joint injections.^{2, 4}

There is no agreed molecular-weight line between the two, and a 2025 review notes that labels use the terms loosely. Some products labelled PN turned out on analysis to be mostly PDRN.^{2, 5} The words on the box are a starting point, not a lab report.

How is a PDRN serum different from a PDRN injection?

By where it goes and what it is allowed to be. A serum is a cosmetic. In Korean cosmetics, PDRN is usually listed on the label as sodium DNA or hydrolyzed DNA, and plant-based versions now exist too: one luxury launch uses PDRN from rice DNA.^{1, 2} It is applied to the top layer of skin. Most of the published research on PDRN is on injections, cells and animals, so how much a cream does depends on the whole formula, not the headline ingredient.²

Put simply, a PDRN cream is a cosmetic. It is not the same as a PDRN injection, and it is not a treatment.

An injection is a medical product placed into the dermis with a needle. In Korea, the regulator, the Ministry of Food and Drug Safety (MFDS), approves PDRN injections as prescription drugs, mainly for wound healing and tissue repair after skin grafts. PN injections such as Rejuran are regulated as medical devices.^{2, 4} Clinics use both for skin-quality treatments.

The table is the reason a serum is not a cheaper version of the injection. It is a different product in a different category, doing a different job at a different depth.

Is Rejuran PDRN or PN?

PN. Rejuran is a polynucleotide product, regulated in Korea as a medical device, and a 2025 review lists it as the example of a PN skin booster.² The confusion is understandable: the same company sells PDRN cosmetics, the same salmon source appears in both, and English menus use "salmon DNA" for everything.^{1, 4} Our guide to Korean skin treatments covers Rejuran as one of the clinic treatments visitors ask about.

For your booking, the difference is practical. Ask which product the clinic uses, whether it is PN or PDRN, and how many cc go into one session.

What the evidence says, and what it does not

There is real research here, and it is thinner than the marketing. PDRN has decades of wound-healing work behind it, including a clinical trial in diabetic foot ulcers.³ For cosmetic PN injections, a 2025 systematic review found nine studies with 219 patients, of low to moderate quality. The results looked promising for fine lines, texture and elasticity, side effects were mostly mild and short-lived, and the authors called for rigorous, high-quality trials.⁶

In practice, Korean dermatologists use PN widely. In a survey of 235 board-certified dermatologists, 88% used PN injections, most often for fine lines on the cheeks and around the eyes. The most common plan was three sessions spaced four weeks apart, injected with a very fine 33G needle into the dermis, and 79% combined it with lasers, radiofrequency or HIFU.⁷

What that does not tell you is what one session will do to your face. Nobody can promise that. A skin-quality injection is a slow, modest change judged over weeks, not a filler and not a lift. If your goal is sagging, read our thread lift guide first. If your goal is shape, this is the wrong tool. Under-eye hollows and bags are their own question, covered in our under-eye guide.

The message that books the right injection

Send this before you pay a deposit:

A clinic that answers with a brand and a number is selling a treatment. A clinic that answers with "our signature PDRN" is selling a word.