Obagi Medical Products Presents In Vitro Data Showing Its Topical Vitamin C Serums Provide Greater Absorption and … (Business Wire via Yahoo! Finance) CHICAGO----Obagi Medical Products, Inc. , a leader in topical aesthetic and therapeutic skin health systems, announced the results of an in vitro study of their Obagi Professional-C and Obagi-C Rx Serums today at the American Academy of Dermatology's Summer Academy Meeting in Chicago. [News Source]