COSRX The Hyaluronic Acid 3 Serum is a highly concentrated 3% hyaluronic acid serum designed to hydrate, plump, soothe, and support the skin's moisture barrier. This serum combines amino acids and Ceramide NP to retain moisture effectively and improve skin texture. The 20ml size is perfect for daily use and travel. The product is new, sealed, and made in Korea, ensuring quality and authenticity.