Born from research unique to a pharmaceutical company, the Obagi C series is the first to use vitamin C, fast-acting vitamin C derivative, and nanofiber gel(R). With just this one product, you can thoroughly care for your troublesome pores, as well as skin texture, firmness, dullness, and dryness. How to use After washing your face, take an appropriate amount (cherry-sized amount) with a spatula and gently apply to your entire face.