Which PDRN Korean Skincare Product Works? A Cream Stays on the Surface, a Needle Reaches the Dermis

I'm Dr. Hyunji Kim, director and lead physician at Delphic Clinic in Gangnam, Seoul. My background is Korea University Medical Center, and I'm a member of the Korean Academy of Aesthetic Surgery & Laser Medicine, the Korean Society for Laser Dermatology & Hair and the Korean Filler Society. Lifting, laser and anti-aging treatments fill most of my clinic days.

"Which PDRN cream should I buy for my mom: the pharmacy one, or the one a Reddit thread ranks first for PDRN Korean skincare?" Some version of that question comes up in my consultation room often, usually from people in their 40s and 50s whose skin has turned dry and thin, or from adult children shopping for a parent. My answer is that no single product wins, because PDRN on a cream label and PDRN in a syringe reach different depths of the skin.

• Before buying anything, take a photo of the ingredient list. Where PDRN sits on it tells you more than the brand does.
• If dryness is your only concern, the label check and the section on not needing a clinic are the parts of this page that matter to you.
• At Delphic, treatments are performed by a doctor, same-day treatment is possible, and English and Chinese interpreters are on site.

What are PDRN threads really arguing about?

Mostly texture, scent and whether a serum pills under makeup. For a cosmetic, those comparisons make sense, and threads handle them well. They go wrong when a jar gets credit for what clinic PDRN is studied for: repair, thicker-feeling skin, softer scars.

The same handful of questions comes up again and again:

• "Is the pharmacy version stronger than the beauty-store version?"
• "Is this the same thing as the salmon injection?"
• "Why did my skin feel great for two days and then nothing changed?"
• "Can I put it on after a laser?"

The first three share one answer underneath. What a PDRN cream can do depends on how far it gets into the skin, and on intact skin that is not very far. The fourth question has a different answer, which I come back to below.

"Salmon DNA repairs skin": where that claim comes from

The repair claim comes from medical research on PDRN that was injected or applied to wounds, not from cosmetics on healthy faces. A 2021 review in Pharmaceuticals by Galeano and colleagues describes PDRN as DNA fragments extracted from the sperm of salmon trout or chum salmon, studied for slow-healing wounds, burns and skin-graft donor sites.

The proposed mechanism is mainly activation of adenosine A2A receptors, with a second route the authors call the salvage pathway, where the fragments supply building blocks for DNA synthesis and repair. The review also says plainly that the molecular mechanism is still far from fully understood, and much of the evidence comes from cell studies, animal models and small clinical trials. In short: PDRN has been studied mainly for wound healing, and mostly through routes that bypass the skin's outer barrier.

Can a PDRN cream get past the outer layer of skin?

On intact skin, mostly not. The same review gives PDRN a molecular weight of 50 to 1,500 kilodaltons. The outer layer of skin is built to keep large molecules out, and a 2000 review in Experimental Dermatology by Bos and Meinardi proposed that a compound generally needs to be under 500 daltons to be absorbed through skin.

Large molecules that stay on the surface can still hold water and leave skin feeling smoother and less tight, which is what many dry-skin readers actually want. The effect is closer to the other moisturizers on the shelf than to the injection a friend had in Seoul, and it fades when you stop using it.

Broken skin is different. After a laser, microneedling or on a wound, the barrier is open and more of anything gets in. That is why research on topical PDRN centres on wounds, and why the answer to "can I put it on after a laser?" is: ask the person who treated you before applying any new product to freshly treated skin.

Skincare PDRN and clinic PDRN are two different products under one name

Whether you bought it at a pharmacy counter or a beauty store, a PDRN cream sold over the counter is, in most cases, a skincare product. Clinic PDRN is a medical injection placed by a doctor. Comparing them by brand misses the bigger difference, which is depth.

On our own menu, PDRN appears as the PDRN Salmon Injection, and also inside a Potenza package for pores and scars, where the PDRN vial is unboxed in front of the patient. Rejuran is the related polynucleotide (PN) option, also derived from salmon DNA; our treatment description lists a recommended interval of 2–3 weeks and about 1–3 days of downtime. If you're torn between those two, I've written separately about choosing between salmon injection and Rejuran.

A label check before you buy any PDRN cream

Six questions sort most PDRN products in under a minute, and none of them is about which brand a thread ranks first. Take a photo of the box in the shop and run through these:

• Is it sold as a cosmetic? Then judge it as a moisturizer: texture, how your skin feels the next morning, whether it stings.
• Where does PDRN (sodium DNA) sit in the ingredient list? Near the end usually means a small amount. That's fine for a moisturizer, but don't buy the repair story with it.
• Does the box promise injection-like results? A cosmetic that claims to work like a skin booster is making a marketing claim, not a medical one.
• Is it heavy on fragrance or essential oils? Dry, thinning skin in the 40s and 50s often reacts to these more than to the PDRN itself.
• Will it go on broken or freshly treated skin? Ask the clinician who treated you first.
• Do you have a known fish allergy? Patch-test a cream on your inner arm for a few days, and tell any doctor before an injection.

If you're buying for a parent, the same six questions apply, and question 4 matters most. Older skin that already feels tight tends to tolerate a fragrance-free formula better than a perfumed one.

If you've run the six questions and still can't tell whether your skin needs a jar or a needle, a daylight photo of your skin is where that answer starts.

When you don't need to come to a clinic

If your main concern is dryness or tightness that an unscented moisturizer and daily sunscreen keep under control, you don't need an injection. A cream you tolerate well and use every day will do more for comfort than one session of anything.

The same goes if you're visiting Seoul mainly to shop for skincare. Enjoy it, use the label check above, and skip the clinic. And if your skin is in an eczema flare, has an infection, or you're pregnant or breastfeeding, elective injections are generally postponed, so that isn't the trip for one.

PDRN injection risks, side effects and who it is not right for

A PDRN injection is not a fit during pregnancy or breastfeeding, with active inflammation or infection at the site, or for anyone hoping for a visible lift. Because PDRN is derived from salmon, a fish allergy is a precaution to raise with the doctor first.

Common reactions include redness, swelling, small bumps at the injection points and bruising, which usually settle within days.

Injected PDRN is generally given as a series of sessions rather than once; how many and how far apart is set at the exam.

Bruising is more likely if you take blood thinners or certain supplements, so bring a list of your medications to the consultation. If your real worry is sagging along the jaw rather than dryness or texture, PDRN is the wrong category. That question belongs to lifting devices such as Ultherapy or Thermage FLX, and it deserves its own exam.

What I look at before saying yes is fairly concrete. How thin the skin feels when I pinch it gently over the cheekbone. Whether fine lines are crepey all over or only where you smile. Whether there are pitted scars or redness that changes the plan. How the skin has reacted to past treatments. Individual results vary, and the in-person exam decides whether an injection makes sense at all.

What a thread can't see, and what I'd need to

A thread can't see your skin, and a product ranking doesn't know whether your dryness sits on the surface or comes with thinning underneath. A daylight photo without makeup and the ingredient list of what you use now tell me far more than any ranked list.

If you do visit, Delphic Clinic is at 476 Gangnam-daero, Urban Hive Building 2F, by Exit 3 of Sinnonhyeon Station on Line 9 and the Shinbundang Line. Hours are Monday to Friday 10:30–21:00 and Saturday 10:30–17:00, closed Sundays. Consultations are 1:1, English and Chinese interpreters are on site, and same-day treatment is possible when it's appropriate. The Delphic Clinic English homepage lists the full treatment menu.

For more on how injected PDRN fits dry skin specifically, see my notes on salmon injections for dehydrated skin, and for the shorter version of this conversation, what I tell patients who ask about Korean PDRN. If hydration is the whole goal, a gentler in-clinic option is covered in my aqua peel facial guide.

If you or a parent are weighing a jar against a needle, send two photos on WhatsApp: the skin in daylight without makeup, and the ingredient list of the cream you use now. That way your 1:1 consultation can start from your skin rather than from a ranking, and "keep the cream" stays a possible answer.