How to check whether your salmon DNA serum is the real thing

Pick up a salmon DNA serum and you cannot tell from the front of the box whether it contains the ingredient the research is about. The words are identical either way.

PDRN is one of the most argued-about ingredients in Asian beauty at the moment. What has not arrived alongside it is any easy way for you to check what you bought.

Why is everyone suddenly selling salmon DNA?

PDRN started as something a doctor injected. People saw results, the word traveled, and the beauty industry did what it does with any word that carries a clinic's authority. It put it on a bottle you can buy without an appointment.

That move is not dishonest by itself. Plenty of good skincare began in a clinic. The trouble is that the word arrives on the shelf with its full authority intact, while the evidence behind it stays back in the clinic.

Is a serum the same thing as the clinic treatment?

No. The studies people point to when they sell you a serum were mostly done on injections, and a needle puts the ingredient under the skin. A serum sits on top and has to get through a barrier that exists specifically to keep things out.

Published evidence for a leave-on cosmetic version doing what the injected version does is thin, though not absent. The marketing rarely draws that line for you, so you can end up paying serum money against the reputation of a treatment you never received.

Judge a PDRN serum as skincare, then. It may leave skin looking smoother and feeling firmer, and how it performs on your face over a few weeks is the only test that tells you anything.

How do I know if what I bought is actually PDRN?

Turn the box over and look for Sodium DNA. You will never see the words "salmon DNA" on an ingredient list. You will see Sodium DNA, sometimes written as DNA-Na, or Hydrolyzed DNA.

That one label name covers a wide range, which is where people feel misled. Some products use a cosmetic-grade material. Some use a plant-derived stand-in, often from red algae, sold as a vegan alternative. All of it can go to market under the PDRN banner, and none of it has to appear on the front of the box.

A vegan stand-in is not a scandal, and some people prefer one. The problem is being unable to tell which you are holding while paying the price the clinic word commands.

Two things you can check in the time it takes to read a label. First, where Sodium DNA sits on the list, since ingredients appear in descending order of how much is in there, and something near the top is a different proposition to something buried near the bottom. Second, whether the brand publishes a concentration at all. Plenty do not, and that silence is itself information.

Why does a big number on the front not settle it?

A number can measure the wrong thing. You will see figures like ppm printed in large type, and a ppm figure can describe a diluted solution rather than the active ingredient inside it. Two products can print similar-looking numbers and mean quite different things.

A Korean brand spent July under sustained criticism for a "625%" figure that people could not reconcile with what was in the bottle. When a number is the loudest thing on a package and the hardest thing to verify, slow down.

Why is this worrying right now, and not last year?

The launches are outrunning the checking. More brands add PDRN every month, review volume keeps rising, and the ingredient has started migrating from the glass-skin conversation into the barrier conversation, which widens what gets claimed for it. None of that came with better labeling.

The money is not the worst of it. You buy something you believe is doing real work, you build a routine around it, and for six months you stop looking for the thing that would have actually helped. A boring label check costs you two minutes and can save you those months.

So what should a normal person do?

Read the ingredient list before you read the front of the box. Look for Sodium DNA and note where it sits, and prefer brands that publish a concentration over brands that publish adjectives.

Patch test on your inner arm for a few days, change one product at a time, and judge the result on how your skin looks and feels after a few weeks rather than on what the box promised.

If a product carries salmon-derived PDRN, mention it to anyone with a fish allergy before you hand it over as a gift.

What we look for when we buy

We import from Japan every week, so we read these ingredient lists whether we want to or not. Brands that publish a number and a full list are usually the ones with the least to hide, and the ones selling hardest on the front of the box are usually the quietest on the back.

LipoPeel is one of the lines we carry and a fair example of the first kind. Its own site publishes the concentration, lists Sodium DNA sixth on the label of both products we stock, and names where the salmon comes from. Go and check that yourself before you take our word for it, and apply the same check to anything else you buy, including from us.