The #1 Brightening Specialist in the US*, C. E. O. 15% Vitamin C Brightening Serum is targeted to quickly fight the look of dullness, dark spots, and discolorations at the source, while diminishing the signs of premature aging. Skin looks firmer and plumper, as youthful skin bounce and even-tone are restored. C. E. O. 15% Vitamin C Brightening Serum, uses a sophisticated, ultra-powerful form of Vitamin C called THD Ascorbate. Both highly stable and oil-soluble, THD Ascorbate rapidly absorbs into the skin for visible anti-aging benefits, including visual improvement in loss of firmness, the appearance of lines and wrinkles, and dark spots and dullness. PHYTOSTEROLS COMPLEX: Isolated from soybeans and containing at least 40% β-sitosterol, these concentrated phytosterols help reduce the look of redness due to skin sensitivity. *The NPD Group/ U. S. Prestige Beauty Total Measured Market, Skincare Product Dollar Sales, Primary Benefit: Brightening, January-December 2021 | Sunday Riley C. E. O. 15% Vitamin C Brightening Serum, 0. 5 fl. oz | Dermstore