numbuzin No.3 Blue Retinol Pore Refining Serum Pore-Refining Retinol Serum for Beginners ① Beginner-Friendly, Low-Irritation Retinol This fast-absorbing, gentle blue retinol delivers a powerful pore-minimizing effect and improves skin texture with less irritation than traditional yellow retinol, making it thoughtfully designed for retinol beginners. ② Visibly Tighter Pores + Smoother Texture + Even Skin Tone Blue Bio-Retinol and 10% Niacinamide work together to refine pores, reduce fine lines, and balance uneven skin tone for overall skin improvement. ③ Clinically Proven Pore-Care Results Clinically tested to improve 10 pore-related concerns, including size, depth, and volume, while reinforcing the skin barrier for a firmer, healthier look.