Obagi-C RX System C-Exfoliating Day Lotion 2oz. This unique formula gently exfoliates and accelerates skin cell turnover, while hydrating and protecting skin. Use after C-Clarifying Serum to enhance the radiance of your skin. Directions: Apply to face and neck in the morning after applying the Obagi-C Rx System C-Clarifying System. Massage in gently, follow with the C-SunGuard SPF 30. As with all Obagi products, we encourage you to see a medical professional to determine if these products are right for you. We do not recommend purchasing these products without a medical professionals'recommendation and strongly encourage you to continue to follow up with your physician on a regular basis.