COSRX The Hyaluronic Acid 3 Serum is a highly concentrated formula containing 3% low molecular weight hyaluronic acid, designed to provide deep hydration and plumpness to the skin. Enriched with an amino acid complex and Ceramide NP, it strengthens the skin barrier, retains moisture, and protects against dryness and dehydration. Suitable for all skin types, especially dry and dehydrated skin, it absorbs quickly without leaving a greasy residue, leaving the skin smooth and hydrated.