What PDRN actually is
PDRN stands for polydeoxyribonucleotide. It is a fragment of DNA, and in skincare it is most often sourced from salmon, specifically from salmon milt (the reproductive cells). The DNA is purified and broken into small fragments so it can be used in a cosmetic formula.
On an ingredient list it usually appears as Sodium DNA, DNA or sometimes PDRN. If you see one of those near the top of the list, the product contains a meaningful amount; near the bottom, it is a trace.
Why salmon?
Salmon DNA is structurally similar to human DNA and is relatively easy to source and purify at scale, which is why it became the standard in Korean skincare. It is also the reason PDRN products are not vegan: the ingredient is animal-derived. If you have a fish allergy, skip it.
Why it is used in serums
In cosmetics, PDRN is valued for how skin feels with it: hydrated, comfortable and calm. Serums are the natural format because they deliver a light, watery texture that absorbs quickly, and because PDRN pairs well with other hydrating ingredients such as hyaluronic acid.
You will see much bigger promises online. We keep to what a cosmetic product can honestly claim: the look and feel of the skin. PDRN serums are not medical treatments, and a serum bought online is not the same as a procedure performed by a doctor.
What it is usually paired with
- Hyaluronic acid: holds water on the surface of the skin for a plump, hydrated feel.
- Niacinamide (vitamin B3): one of the most studied skincare ingredients, known for the look of an even, healthy tone.
- Collagen: a large protein that sits on the surface and helps skin feel smoother and look plumper.
How to read a PDRN serum label
- Look for Sodium DNA or DNA and note where it sits in the list.
- Check the full INCI list is published. A brand that hides it has a reason.
- Prefer a short list if your skin has become sensitive.
- Ignore percentages and 'clinical results' unless the study is linked and you can read it.
Who tends to like PDRN serums
Women whose skin has changed in their forties and fifties: drier, duller, more easily irritated, less bouncy. A light hydrating serum that feels good and layers under everything is often the simplest first step, and PDRN serums fit that brief well.
The short version
PDRN is purified salmon DNA. It is a hydrating, comforting cosmetic ingredient, not a miracle and not a medicine. Choose a product with a published ingredient list, patch test it, and give it a few weeks.