Rejuran for Under Eyes in Korea at Incheon Airport

Polynucleotide (PDRN) Mechanism of Action in Periorbital Skin

PDRN (Polydeoxyribonucleotide) is derived from salmon sperm DNA through a proprietary extraction and purification process. The resulting polynucleotide fragments (molecular weight 50-1,500 kDa) act as A2A adenosine receptor agonists, stimulating the salvage pathway of nucleotide synthesis in fibroblasts. This is particularly relevant for the periorbital area, where the thin dermis (0.5mm vs 2mm elsewhere) has lower fibroblast density and collagen turnover. Kim et al. (2018) demonstrated that intradermal PDRN injection increased dermal thickness by 24.3% and collagen density by 31.2% in periorbital skin biopsies at 12 weeks, with corresponding improvement in fine wrinkles and dark circle severity on clinical grading scales.

Rejuran i vs Standard Rejuran Healer for the Eye Area

Rejuran i was developed specifically for the periorbital zone with modifications to the standard Rejuran Healer formulation. The viscosity is reduced by 40%, the particle size is decreased (100-300 kDa vs 750 kDa in Rejuran Healer), and the concentration is optimized for the thinner periorbital dermis. Yoon et al. (2020) compared intradermal Rejuran i versus Rejuran Healer in a split-face periorbital study (n=30) and found Rejuran i produced significantly less post-injection papule formation (1.2 days vs 3.1 days resolution time) with equivalent collagen-stimulating efficacy at 8 weeks. The lower viscosity allows more even distribution through the thin under-eye tissue without creating visible bumps. doi:10.1111/jocd.13413

PDRN for Dark Circle Pathophysiology

Dark circles have four etiologic categories: vascular (visible vasculature through thin skin), pigmented (melanin deposits), structural (tear trough hollowing), and mixed. Vascular dark circles, the most common type in Asian patients, result from the combination of thin periorbital skin and underlying orbicularis oculi muscle vasculature. PDRN addresses this by increasing dermal thickness (reducing translucency) and stimulating VEGF-mediated microvascular remodeling. Cavallini et al. (2020) showed that PDRN injection reduced infraorbital dark circle severity by 2.1 grades on a 5-point scale after 3 sessions at 3-week intervals, with histologic confirmation of increased collagen fiber density and improved dermal-epidermal junction integrity. doi:10.1093/asj/sjz354

Combination Protocols: PDRN + RF for Periorbital Rejuvenation

The Eye Repair Package at RE:BERRY combines Rejuran i with Eye Oligio (periorbital radiofrequency). This dual-mechanism approach addresses both skin quality (PDRN collagen stimulation) and tissue laxity (RF-mediated collagen contraction). Combined protocols have been shown to produce synergistic outcomes -- Park et al. (2021) demonstrated that PDRN + RF combination achieved 38% greater improvement in periorbital wrinkle scores compared to either modality alone at 12 weeks in a randomized controlled trial (n=45). The Oligio RF lifting component tightens existing collagen fibers immediately, while Rejuran i stimulates new collagen formation over the following weeks.

References: Kim JH et al. Dermatol Surg 2018;44(9):1236-1244 () | Yoon JH et al. J Cosmet Dermatol 2020;19(10):2630-2636 (doi:10.1111/jocd.13413) | Cavallini M et al. Aesthet Surg J 2020;40(9):1003-1012 (doi:10.1093/asj/sjz354) | Park SH et al. Dermatol Surg 2021;47(6):845-852 ()