What it is: An oil-free brightening serum that targets discoloration.What it does: Vitamin C ester gives the appearance of collagen-rich skin by visibly smoothing, brightening and minimizing discoloration over time. Squalane helps hydrate and visibly reduce the appearance of fine lines and discoloration over time, and rosemary leaf extract helps tighten the appearance of skin. How to use: After cleansing, massage onto your face and neck using a gentle upward motion. Wait until fully absorbed and follow with your favorite Perricone MD moisturizer. Use morning and evening. 1 oz. Oil-free Made in the USA