Serum High Concentration Vitamin C Derivative Fermented Collagen This rich, concentrated vitamin C serum contains fermented collagen liquid, which is rich in amino acids, and does not contain a single drop of water. Formulated with three types of the latest vitamin C derivatives and coenzyme Q10, it addresses complex skin concerns from multiple angles. Recommended for use twice a day, morning and night. In the morning and evening, after preparing your skin with lotion, take an appropriate amount (4-5 drops) onto your palm and blend into your face. It is also recommended to use it as a booster, applying it to your skin immediately after washing your face. BKv038R With box