A patented daytime vitamin c antioxidant face serum that delivers advanced environmental protection and diminishes the appearance of fine lines and discoloration. Key Components 10% pure vitamin C (l-ascorbic acid) 0.5% ferulic acid Indication Improves the appearance of discoloration, fine lines, and uneven skin tone. How to use In the morning after cleansing and toning, apply 4-5 drops to a dry face, neck, and chest before other skincare products. May be used on the back 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.