PDRN (Salmon DNA)

How it works

Polydeoxyribonucleotide (PDRN) is a polymer of deoxyribonucleotide chains extracted primarily from salmon sperm or milt DNA, then purified and fragmented for pharmaceutical and cosmetic use. It is believed to work by activating adenosine A2A receptors on fibroblasts and other cell types, which can stimulate fibroblast proliferation, promote angiogenesis, and support tissue repair pathways. In skincare, this cellular signaling translates to claims of improved skin regeneration, accelerated wound healing support, and enhanced barrier recovery after damage from procedures or environmental stress.

The evidence

PDRN has a longer, more established history of use in injectable and medical wound-care contexts, including diabetic ulcer treatment, where clinical research supports its role in tissue regeneration and healing acceleration through adenosine receptor activation. Its use in topical cosmetic formulations is comparatively more recent, and while mechanistic plausibility is strong given the injectable research base, direct clinical trials evaluating topical cosmetic PDRN serums specifically remain more limited than the medical literature.

Suitability

• Considered generally well tolerated across skin types, including sensitive and post-procedure skin recovering from microneedling or laser treatments.
• Popular in Korean and broader Asian skincare markets as a regenerating serum or ampoule ingredient.
• Not vegan, as it is derived from fish DNA; alternative synthetic or plant-based nucleotide ingredients exist for those avoiding animal-derived actives.

Concentration

• Cosmetic formulations typically use low concentrations, often under 2%.
• Injectable and medical-grade PDRN use represents a distinct, higher-concentration clinical application outside standard cosmetic dosing and is not directly comparable in strength or delivery. Consistency of use over several weeks is typically recommended to observe visible improvements in texture and radiance.

Conflicts & combinations

• No major known conflicts with common actives; generally considered layerable with humectants and peptides.
• Pairs well with hyaluronic acid and peptide serums for combined hydration and regenerative support.
• Because long-term topical safety data is still developing, patch testing is advised for sensitive or reactive skin before regular use.
• Often marketed alongside other regenerative or barrier-repair ingredients in layered ampoule-and-serum routines.