Improve skin hydration with PCA SKIN Hyaluronic Acid Boosting Serum. This skin boosting serum provides lasting hydration by working on the skin’s surface while increasing the skin's natural production of hyaluronic acid. Hydrolyzed hyaluronic acid in this serum helps smooth fine lines while providing deep hydration. PCA SKIN Hyaluronic Acid Boosting Serum also includes a proprietary HA-Pro Complex that encourages hyaluronic acid production for long-term hydrating and anti-aging benefits. In addition to hydrating the complexion, this serum also works to strengthen the skin barrier and prevent moisture loss with protective ceramides and antioxidant-rich niacinamide.