The Obagi-C Rx System is the first and only system offering the benefits of both prescription-strength Hydroquinone and potent Vitamin C in one comprehensive regimen. It's carefully formulated to give you everything you need to ensure your young skin stays that way. Obagi-C Rx addresses all the needs of young skin by correcting hyperpigmentation through regulating the production of the cells responsible for pigment in your skin, promoting skin cell turnover through gentle exfoliation to expose more radiant, healthy skin, and preventing future skin cell damage by neutralizing free radicals and protecting the skin from UVA (aging) rays and UVB (burning rays).