Obagi Professional-C Serums use advanced scientific formulas developed and tested by leading Vitamin C experts to provide maximum daily antioxidant protection against free radicals, which cause premature signs of aging including fine lines and wrinkles.

Our unique formula provides greater penetration of ingredients than other Vitamin C products — delivering greater antioxidant benefit to your skin!

Obagi Professional-C Serum 20% contains 20% L-Ascorbic Acid (the strongest and most effective form of Vitamin C) to provide antioxidant protection against free radical damaged caused by the sun's harmful rays.