COSRX 5PDRN Collagen Intense Vitalizing Serum: PDRN and Peptides in a Large-Format Serum

COSRX's entry into the PDRN category arrives with a generous 100ml bottle at $52, notably larger than most PDRN serums on the market (REJURAN Healer is 30ml at $52). The "5PDRN" name refers to five PDRN-adjacent actives in the formulation: standard PDRN, converted PDRN, peptides, collagen fragments, and supporting hyaluronic acid. This positions as the accessible, high-volume PDRN option for users who want daily generous application without the premium pricing of single-purpose PDRN ampoules.

COSRX has built a reputation on delivering derm-quality formulations at mass-market prices. The 5PDRN Serum is their take on the PDRN trend, and the value equation (5 actives, 100ml, $52) is genuinely strong. The trade-off compared to specialized PDRN brands: the PDRN concentration is lower per active, but the overall active load is spread across multiple PDRN-adjacent compounds. For daily maintenance routines, this is the right balance.

What It Does

Standard PDRN and converted PDRN (c-PDRN) provide regenerative signaling and collagen support. The peptide complex adds firmness signaling. Hydrolyzed collagen fragments deliver surface plumping. Multi-weight hyaluronic acid hydrates. Niacinamide supports barrier function and mild brightening. Over 6 to 10 weeks of daily use, visible firmness improvement, texture smoothing, and overall radiance support.

Who It's For

• Mature skin (30+): Primary target. Anti-aging routine builders.
• PDRN-curious users: Accessible entry before committing to REJURAN-tier pricing.
• Daily-use routines: Large bottle supports generous daily application.
• Budget-conscious anti-aging shoppers: Multiple actives at accessible pricing.
• Combination skin: Lightweight serum suits most skin types.

Key Specs

• Volume: 100ml
• Price: $52.00
• Hero actives: PDRN, c-PDRN, peptide complex, hydrolyzed collagen, hyaluronic acid
• Texture: lightweight serum
• Fragrance: very mild

How to Use

After cleansing and toning, dispense 2 to 3 pumps into palms. Press onto face and neck, patting until absorbed. Use AM and PM. Follow with moisturizer. 100ml lasts approximately 3 to 4 months with twice-daily use.

FAQ

How does it compare to REJURAN Healer Turnover Ampoule?

REJURAN uses high-concentration proprietary c-PDRN with clinical pedigree from the injectable version. COSRX uses a broader PDRN-adjacent blend at lower individual concentrations. REJURAN is more potent per ml. COSRX offers more volume and lower cost. For strict PDRN maximalism: REJURAN. For daily value and routine simplicity: COSRX.

What is 5PDRN?

It's COSRX's name for the five-component active blend: standard PDRN, converted PDRN, peptides, collagen fragments, and hyaluronic acid. Not all five are true PDRN in the strict salmon-derived polydeoxyribonucleotide sense; some are PDRN-adjacent or complementary. The name is marketing-heavy; the formulation is legitimate.

How long until results?

6 to 10 weeks for visible firmness and texture improvement. Hydration benefits appear earlier (within 1 to 2 weeks). PDRN works at cellular signaling level, requiring full skin turnover cycles.

Can I layer with retinol?

Yes. Apply this serum first, let absorb, then retinol as the active layer. The PDRN and peptide content actually reduces retinol irritation by supporting regeneration.

Vegan?

No. PDRN is salmon-derived. Users avoiding animal-derived ingredients should skip PDRN products and look at vegan collagen alternatives.

Related Products

Pair with COSRX Advanced Snail 96 Mucin Power Essence as a hydrating prep layer. Browse the full COSRX collection or related: PDRN products, Korean serums.