what is the best rated vitamin c serum?
['Natural Pick. ... ', '7 Universal C Skin Refiner. ... ', 'Natural Pick. ... ', '9 Vitamin C Ester Brightening Serum. ... ', '10 Fresh Pressed Daily Booster with Pure Vitamin C 10% ... ', '11 Pineapple-C Brightening Serum. ... ', '12 Obagi System Professional-C 20% Vitamin C Serum. ... ', 'Amazon Deal. TruSkin Vitamin C Serum for Face.']