KOSE COSMEPORT Vitapuru Double Action Repair Serum 15 Serum 40ml ●A dual-action serum with high-concentration vitamin C derivative and retinol derivative. ●An intensive treatment that enhances clarity and leads to firm, radiant skin. ●Two separate serums dispensed simultaneously with a dual-chamber design. How to Use When using for the first time, pump several times until contents come out. After washing your face or applying the introductory serum, mix an appropriate amount (2-3 pumps) in the palm of your hand and apply gently to skin.