About PDRN
PDRN vs PN — What's the Difference?
Both are polynucleotide-based injectables, but they differ at a molecular level. The distinction matters when selecting the right product for a specific skin concern.
PDRN and PN both derive from polynucleotides, but PDRN is a smaller, more specific fraction of the DNA chain. Most clinical evidence for anti-inflammatory and regenerative effects comes from PDRN research. PN covers the full polynucleotide chain and underpins the majority of Rejuran products. In practice, both work through similar mechanisms — the distinction matters most when selecting a product for specific skin concerns.
Molecular Difference
Polynucleotides are chains of DNA building blocks (nucleotides). The full chain is called PN. PDRN is a defined sub-fraction of that chain — specifically a low-molecular-weight fraction associated with activation of adenosine A2A receptors.
This receptor activation is the mechanism most strongly linked to PDRN's anti-inflammatory and tissue-repair effects. PN products also engage these receptors but across a wider molecular weight range.
PDRN
Polydeoxyribonucleotide
- ✓Specific shorter-chain fraction of polynucleotide
- ✓Strong documented anti-inflammatory action
- ✓Targeted adenosine A2A receptor activation
- ✓Best for: redness, sensitive skin, scarring, under-eye repair
- ✓Used in: Kiara Reju PDRN
PN
Polynucleotide
- ✓Full polynucleotide chain — broader molecular range
- ✓Broader biostimulation across multiple receptors
- ✓Strong collagen stimulation and hydration
- ✓Best for: full-face rejuvenation, elasticity, hydration
- ✓Used in: Rejuran Healer, Rejuran i, Rejuran HB Plus
Clinical Effect Comparison
| Property | PDRN | PN (full chain) |
|---|---|---|
| Molecular weight | Lower — shorter chain fragments | Higher — full polynucleotide range |
| Primary mechanism | Adenosine A2A receptor activation | Adenosine receptor activation + broader biostimulation |
| Anti-inflammatory effect | Strong — well documented | Present — somewhat less targeted |
| Collagen stimulation | Yes | Yes |
| Hydration improvement | Moderate | Strong (especially Rejuran HB Plus) |
| Best clinical use | Redness, scarring, sensitive skin, under-eye repair | Full-face rejuvenation, elasticity, hydration |
Which Should a Patient Choose?
For most full-face rejuvenation goals — improving skin texture, elasticity, and overall quality — PN products like Rejuran Healer perform well. For patients with active inflammation, redness, or rosacea-prone skin, PDRN-specific products may offer a stronger anti-inflammatory response. For the under-eye area, both PDRN and targeted PN formulations are available.
The treating practitioner will select the appropriate product based on skin assessment. Both categories have a strong safety profile.