numbuzin No.3 Blue Bio-Retinol Pore Refining Serum[Pore Refining Retinol Serum for Beginners] This fast absorbing, gentle blue retinol delivers powerful pore minimizing effect and improves skin texture with less irritation than traditional yellow retinol, making it thoughtfully designed for retinol beginners. [Key Ingredients] Formulated with Blue Bio Retinol + 10% Niacinamide, this powerful duo works in perfect synergy to refine the skin and soften the appearance of fine lines. Blue Bio Retinol