Your friend's new serum is made from salmon DNA, which makes tonight's cedar-plank fillet an awkward centrepiece.

Léa sets the little glass ampoule beside the wine. Then she passes it down the table. She has used it for three weeks, and she swears her skin feels bouncier. By the time the salad plates are cleared, everyone wants to know whether it works.

By dessert, you will be the one who knows. The injections that clinics use have real, if young, research behind them. The bottle is betting that DNA can soak through skin. Skin is very strict about what it lets in.

The short answer: PDRN is purified DNA, most often from salmon. Injected by a clinician, it has early evidence for smoother skin and faster healing after laser treatments. As a serum you rub on, it has almost no proof yet, so buy a PDRN product for its other ingredients and the way it feels.

What is PDRN, and why is it made from salmon?

PDRN stands for polydeoxyribonucleotide, a mouthful that simply means short pieces of DNA. Most of it comes from salmon sperm, purified until only the genetic strands are left. The fish supply it in bulk. That is why it turns up everywhere, from vials to sheet masks.

Doctors in Italy started using it in the 1980s to help stubborn wounds close. In lab dishes, the fragments press on a receptor on repair cells. The receptor works like a doorbell. Ring it, and the cells move in, multiply and calm the swelling around an injury.

Korea turned a wound remedy into a beauty ritual. In 2014 the company PharmaResearch launched Rejuran, an injection made from salmon DNA, and a take-home ampoule followed in 2017. The idea has since gone global. Trend tracker Spate counted about seven times more online interest this past year than the year before.

Three hundred and fifty faces in Korea and Thailand

Earlier this year, reviewers gathered every study of the injections near the eyes. They found six, with 350 people between them, mostly middle-aged women in Korea or Thailand. Crow's feet softened over about three months, and nobody tracked the results past six months.

The clearest benefit sits somewhere less glamorous. A separate review of controlled trials found the strongest results in wound healing, where the fragments helped damaged skin close sooner. No serious side effects turned up in those studies.

One Korean trial shows how a clinic might use it. Twenty-five women had a needling treatment that heats the skin with radio waves. Each then had the salmon DNA injected into one cheek. The other cheek got plain salt water.

Six weeks later, the injected side held more moisture and lost less water through the surface. Its redness faded faster, and the women liked that side better. The deeper layer of skin, the one that gives a face its spring, looked the same on both sides.

The Canadian catch

Try to book the injection at home and you meet a twist. According to Dermapure, a Canadian clinic chain, injecting PDRN products is not authorized in Canada. Canadian practitioners apply it to the surface instead. They do it straight after microneedling, laser or radiofrequency treatments.

The timing is the clever part. Those treatments leave tiny channels in the skin for a short while. The DNA goes on while the door is still open. Ask which product is used and what Health Canada has approved it for, and expect a clear answer.

Is PDRN serum proven to work?

No. In 2000, two Amsterdam dermatologists described a rule of thumb that drug makers still follow. Molecules heavier than 500 daltons, the unit chemists use to weigh them, rarely get through the outer layer of skin.

DNA fragments are far heavier than that limit. Labs building creams with PDRN now wrap it in tiny fat bubbles or bind it to other molecules. They name poor penetration as the main problem to solve.

Only one human trial has tested a PDRN cream on wrinkles, and it used a fragment cut to a special length to help it travel. The serum on a drugstore shelf has no trial of its own.

The claim Viva verdict
Injections soften fine lines EMERGING: small, short studies
Speeds recovery after laser EMERGING: the strongest case
Serum rebuilds collagen EXPERIENTIAL: no trial yet
Plant PDRN works the same Lab dishes only

The small molecule already in the bottle

Turn the ampoule around and read the label. Many PDRN products lean on supporting ingredients. The best proven of them is niacinamide, a form of vitamin B3. At 122 daltons, it slips well under the Amsterdam limit.

Procter & Gamble once tested it on 50 women with sun-aged skin. Each put 5 per cent niacinamide on one half of the face and a plain base on the other. They did it twice a day for 12 weeks. The treated side showed fewer fine lines and dark spots, less redness and less yellowing. The company made the cream, so read it as one careful but industry-funded result.

The free part of the plan is patience. Give any new routine a full season before you judge it, and take a photo in the same window light on day one. Your memory of your own face is a generous liar.

Woman in a white robe pressing a soaked toner pad to her cheek in a bright marble bathroom

MEDIHEAL PDRN Lifting Pads soak the salmon DNA in an essence that also carries niacinamide, panthenol and squalane. The maker promises a cool burst of hydration and a smoother, firmer-looking finish. Laid on the cheeks as a 15-minute mini mask before guests arrive, they earn their spot on the shelf.

So a PDRN serum is worth buying when you love the texture and the label lists the vitamin too. Buy it for the salmon alone and you are paying for the story. The clinic version earns its price in one setting: recovery after a laser or needling session. Raise it at that appointment.

Léa's ampoule goes back into her bag before coffee. The salmon, everyone agrees, was the better investment.

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Frequently asked questions

What is the difference between PDRN and PN?

Both are purified salmon DNA. PN, short for polynucleotide, uses longer strands that form a gel-like scaffold under the skin, while PDRN uses shorter strands that act mainly on the cell receptor. Clinic menus often use the names loosely, so ask which one you are getting.

Is there a vegan PDRN?

Yes. Labs have extracted it from plants, including ginseng roots and a climbing herb called Gynostemma. Early lab work suggests the plant versions act on skin cells in a similar way, but none has been tested against salmon PDRN on people's faces.

Is PDRN cream better than retinol?

One four-week, double-blind trial compared a 0.1 per cent PDRN eye cream, made with a specially sized fragment, with 0.1 per cent retinol on opposite sides of the face. The PDRN side improved about twice as much. It is a single study that has not been repeated, so retinol remains the better-proven choice.

Can I use PDRN if I am allergic to fish?

No published trial has studied people with a fish allergy. PDRN is highly purified DNA rather than fish meat, but check with your doctor or allergist first, and patch-test any new product on your inner arm for a few days before it goes on your face.

This article is for general information and does not replace medical advice. Talk to your doctor, dermatologist or pharmacist before starting an injectable treatment or a new skin routine.

Sources

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