B5 which is known as panthenol is the key ingredient of Hydrium line. B5 has moisturizing, regenerating, and anti-inflammatory effects and is safe to use on all skin type. 42% of the Centella Asiatica extract and the Madecassoside compounds provide mild moisture for sensitive skin and effectively calm sensitive skin. COSRX AC Collection Blemish Spot Clearing Serum is used when you want to remove scars or marks left after the trouble is gone, and Hydrium Centella Aqua Soothing Ampoule can be used for active acne which requires moisturizing without irritation. Even if you layer it several times until the skin is filled with moisture, this lightweight formula absorbs quickly without a greasy or tacky feeling on the skin. This formula is even suitable for acne-prone skin type as it does not cause the pores to clog. Its light texture is suitable for all seasons including hot summers.