Product details:Introducing the Kiehl's Fast Release Retinol Serum 30ml. This Fast-Acting 0.3% Retinol Night Serum Accelerates Skin Surface Cell Renewal With Retinol That Penetrates Up To 15 Surface Layers Deep Into The Skin. Experience Visible Reduction Of Fine Lines In As Little As 5 Days, And Visible Improvement In Deep Wrinkles In 2 Weeks. To Ensure Maximum Efficacy, Its Innovative Packaging Isolates A High Concentration Of Pure Retinol Powder So It Can Be Freshly Mixed Into The Serum Upon First Use. With C Kiehl's Fast Release Retinol Serum 30ml