Quick answer
PDRN is the most-hyped K-beauty ingredient right now. The clinical evidence is for injections; the topical case is much thinner.
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1. A DNA fragment, usually from salmon
PDRN — polydeoxyribonucleotide — is a fragment of DNA, usually sourced from salmon. In clinical medicine it is used by injection to support tissue repair and wound healing, and that use has real evidence behind it.
The honest gap
2. The evidence is for injections, not serums
Almost all of that evidence is for injected PDRN administered by clinicians. Topical PDRN in a serum is a different proposition: DNA fragments are large molecules, and how much penetrates intact skin in a meaningful amount is not well established.
That does not make topical PDRN useless — many formulations are pleasant, hydrating and well-made. It means the marketing is running ahead of the published data.
How to think about it
3. Judge it as a hydrating, soothing product
Treat a PDRN serum as a hydrating, soothing product that may offer some repair support, and judge it on how your skin feels. Do not buy it expecting the results of a clinic procedure.
If you are on a budget
4. Ceramides and niacinamide give more per taka
Ceramides, niacinamide and panthenol have far more evidence per taka.
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Frequently asked questions
Can sensitive skin use a PDRN serum safely?
Most PDRN serums are formulated to be soothing and hydrating, so they are usually tolerated by sensitive skin, though a patch test is still worth doing. Check the ingredient list for added fragrance or high alcohol content if your skin reacts easily.
How do I check if a PDRN or "salmon DNA" serum is genuine?
Match the batch code on the bottle to the one on the box, and check that the ingredient list matches what the packaging claims. A seal that looks already opened or an unusual texture is a reason to check further before using it.
Why do PDRN serums often come in small, opaque packaging?
PDRN and the hydrating ingredients often paired with it can be sensitive to light and air, so brands tend to use small, opaque or airtight packaging to protect them. Clear, oversized bottles sold cheaply are worth extra scrutiny for that reason.