What it is: An advanced serum with plant saccharides and 15 percent vitamin C (THD ascorbate) to visibly minimize pores, brighten dark spots, and target signs of aging. Skin Type: Normal, Dry, Combination, and Oily   Skincare Concerns: Dark Spots, Fine Lines and Wrinkles, and Dullness   Formulation: Serum   Highlighted Ingredients: Advanced Vitamin C (THD Ascorbate): A more stable version of vitamin C that targets visible signs of aging including dullness, loss of firmness, fine lines, wrinkles, dark spots, and redness. Phytosterols Complex: Reduces the look of redness due to skin sensitivity. Saccharide Isomerate Extract: Minimizes the appearance of pores while supporting the skin’s moisture barrier for a smooth, youthful, glowing look. Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, triclosan, and contains less than one percent synthetic fragrance. It is also gluten-free and cruelty-free.   What Else You Need to Know: Powered by a stable, advanced form of vitamin C, this serum rapidly absorbs into skin to visibly brighten and diminish signs of aging while providing powerful antioxidant protection. It leaves skin looking hydrated and firm with less-visible dark spots and wrinkles over time.   How To Use  Suggested Usage: -Use AM and/or PM. For antioxidant protection and a glowing look, apply two pumps every morning to clean skin. For visibly brighter, firmer skin overnight, apply after you cleanse before bedtime.   Sunday says: "I use C.E.O. 15% Vitamin C Brightening Serum twice a day. In the morning, I make a vitamin C cocktail for my skin by mixing two to three pumps with three drops of C.E.O Glow Vitamin C + Turmeric Face Oil. I massage it well into my skin and it rapidly soaks in, and my skin visibly glows. In the morning, I follow with Good Genes All-In One Lactic Acid Treatment and a dab of Tidal Brightening Enzyme Water Cream and then sunscreen. In the evening, I use C.E.O. 15% Vitamin C Brightening Serum after my retinoid step (A+ High-Dose Retinol Serum and Luna Retinol Sleeping Night Oil). I then follow with ICE Ceramide Moisturizing Cream." (All additional products are sold separately.)