Cosrx The Hyaluronic Acid 3 SerumCOSRX Hyaluronic acid 3 Serum is suitable for all skin types and particularly beneficial for dry and dehydrated skin, especially for those experiencing flaky skin, makeup clumping, or who are looking to enhance their skin's moisture retention.. Target concerns Dehydration Dryness Rough texture Sensitive Texture It has a lightweight, non greasy texture that absorbs quickly into the skin, leaving a smooth and hydrated finish.