Sunday Riley C.E.O. 15% Vitamin C Brightening Serum 1.7 oz / 50 ML New in Box. Delivered from Dermstore January 2024. Retails $122. - - - - - - - - - - - - - - - - - C.E.O. Brightening Serum, powered by 15% advanced Vitamin C, is targeted to quickly fight the look of dullness, dark spots, and discolorations at the source, while diminishing the signs of aging. Skin looks and feels firmer and plumper, as youthful skin bounce and even-tone are restored.