CeraVe Hydrating Hyaluronic Acid Serum is a hydrating serum with hyaluronic acid that helps bind moisture to the skin's surface, smoothes the skin and provides up to 24 hours of hydration, while helping to restore the epidermal barrier. With 3 essential ceramides, hyaluronic acid and vitamin B5. ACTIVE INGREDIENTS hyaluronic acid 3 essential ceramides.