Cetaphil Optimal Hydration 48H Activation Serum is a deeply hydrating and skin-replenishing serum specifically formulated to deliver long-lasting moisture for up to 48 hours, making it ideal for individuals with sensitive, dry, or dehydrated skin. This lightweight, fast-absorbing formula is powered by Cetaphil unique HydroSensitiv Complex, which includes blue daisy extract to calm and soothe irritated skin while actively enhancing the skin’s moisture barrier. Enriched with hyaluronic acid, a well-known hydrating agent, it draws and retains moisture within the skin to promote a plump and healthy-looking complexion.