A daytime introductory vitamin C serum for sensitive skin that offers environmental protection and improves the appearance of aging. Key Components 10% L-ascorbic acid 0.2% ferulic acid Indication For normal, sensitive skin How to use In the morning after cleansing, apply 4-5 drops of this antioxidant serum to a dry face, neck, and chest before other skincare products. May also be used on backs of the hands. It is normal for vitamin C products to darken after opening due to air and light exposure. The formula will remain effective. Once opened, it is recommended to be used within 3 months of opening.