SkinCeuticals C E Ferulic with 15% L-Ascorbic AcidSkinCeuticals C E Ferulic with 15% L Ascorbic Acid is a high performance morning vitamin C serum combining 15% pure vitamin C, 1% vitamin E, and 0. 5% ferulic acid to protect skin from environmental damage while improving the appearance of fine lines, uneven skin tone, and firmness. This SkinCeuticals vitamin C serum's lightweight, silky texture leaves the complexion radiant and even.