PDRN (polydeoxyribonucleotide) is the ingredient Seoul cannot stop talking about: DNA fragments, typically salmon-derived, used for decades in Korean dermatology for wound healing and now headlining the "skin longevity" wave - the idea that the goal is not whiter or tighter skin but skin that ages slowly and repairs well.
What it plausibly does in topicals: supports barrier repair, calms post-irritation redness, improves texture over weeks. What it does not do: replace retinoids, erase wrinkles in a fortnight, or work without consistency.
The Korean layering logic is simple - repair first, actives second: a PDRN serum or toner daily as the base, a dermatologist-grade sheet mask (Mediheal's are the national default) two or three times a week, and sunscreen always, because longevity skincare without SPF is fiction.
The PDRN lines from Anua and Mediheal's clinic-staple masks are curated in The Atelier.