What is a skin serum?

A skin serum is a lightweight skincare product with high concentration of active ingredients. Serums have smaller molecules that penetrate deeper into skin compared to moisturizers. They target specific concerns like wrinkles, dark spots, or dehydration. Common serum ingredients include vitamin C, hyaluronic acid, retinol, and niacinamide. Apply serum after cleansing and before moisturizer for best absorption.