Numbuzin No.3 Blue Bio-Retinol Pore Refining Serum 30MlNumbuzin No. 3 Blue Bio Retinol Pore Refining Serum 30 ml is a Korean pore refining serum designed to visibly tighten enlarged pores, smooth uneven texture, and improve early fine lines with lower irritation than traditional retinol formulas. It combines Blue Bio Retinol, 10% niacinamide, and salicylic acid in a lightweight serum to help refine pores, control excess oil, and support smoother, clearer looking skin. Synonym Names Numbuzin No. 3 Blue Bio