The Obagi-C Fx System Protects and Perfects From Cell to Surface. The combination of arbutin plus ascorbic acid has several aesthetic advantages: - Promotes skin rejuvenation with Vitamin C, a topical antioxidant shown to help protect against future skin damage. - Brightens skin with natural and effective arbutin, an extract of plants such as bearberry, pomegranate, and pear. - Minimizes future skin damage by neutralizing free radicals and protecting the skin