SkinCeuticals C E Ferulic With 15% L-ascorbic Acid Serum-1 fl oz- Sealed New box
U.S. Patent No. 7,179,841. Once absorbed, this vitamin C serum remains effective for a minimum of 72 hours. Enhances skin radiance by up to44% ¹. Reduces the appearance of wrinkles by up to36% ¹.