Visibly reduce wrinkles and fine lines with this powerful vitamin C serum. Kiehl’s original formula, infused with 10.5% pure vitamin C, now contains an additional 2% of Vitamin Cg for increased potency, as well as fragmented hyaluronic acid to help instantly smooth skin. In a clinical study, this powerful serum immediately decreased the appearance of fine lines and wrinkles, and improved skin radiance and texture. The appearance of forehead lines, marionette lines and deep-set wrinkles were also reduced after four weeks. Use in the morning and night to experience its warming sensation and fresh citrus scent. Dermatologist-tested for safety and gentle enough for sensitive skin.