What it is: Paula's Choice Resist C15 Super Booster contains a highly concentrated form of vitamin C and an assortment of skin-stabilizing antioxidants and skin-replenishing ingredients that combine to provide exceptional results that improve the appearance of uneven skin tone, brighten a dull complexion and help ward off the appearance of environmental assaults. Who's it for: It's for all skin types and anyone who wants to enhance and improve every aspect of their skin, from uneven skin tone to fine lines and wrinkles, and enrich the surface of their skin. What it does: The booster is a concentrated, light-as-water liquid anti-aging solution to supercharge your skin. A blend of 15% stabilized vitamin C, potent antioxidants including vitamin E and ferulic acid and skin-smoothing peptides helps diminish visible signs of aging for smoother, brighter and firmer-feeling skin. How to use: Apply once or twice daily after cleansing, toning and exfoliating. Dispense 2-3 drops and add to your favorite moisturizer or serum. May also be used alone. For daytime, follow with a broad-spectrum sunscreen rated SPF 25 or greater. May be applied around the undereye area. Avoid eyelids and lips. Brand: PAULA'S CHOICE. Style Name: Paula's Choice Resist C15 Super Booster. Style Number: 1120531. Available in stores.