Highly concentrated serum with antioxidant L-ascorbic Acid for most skin types. Helps minimize the appearance of fine lines and wrinkles while leaving your skin feeling silky soft. Daily use helps to fortify skin and safeguard your youthful appearance. Formulated with pure L-ascorbic acid to optimize efficacy, permeability, and stability. Professional-C Serum 15% is a highly concentrated serum with antioxidant L-ascorbic Acid for most skin types.