COSRX Hyaluronic Acid 3% Serum 20mlCOSRX Hyaluronic Acid 3% Serum 20ml Dehydrated skin is not the same as dry skin it's a condition where the skin lacks water rather than oil, often presenting as tightness, a dull complexion, and exaggerated fine lines regardless of skin type. COSRX Hyaluronic Acid 3% Serum 20ml is a concentrated K beauty hydrating serum formulated specifically to target dehydration at its source. At 3% Hyaluronic Acid, this serum sits in the higher concentration range