L’Oréal Paris Hyaluron Expert [+HA] Plumping Hydration Serum Highest concentration of hyaluronic acid 1.5%, reduces fine lines by 40% after 4 weeks, smooths skin's surface, and replumps fine lines from within Key Component Hyaluronic AcidIndication Reduce fine lines Seriously hydrates Smooths skin's surface How to use: Twice daily apply 2-3 drops to clean, dry skin on the face and neck. Follow up with Hyaluron Expert Cream (Day/Night).