Diet Dr Pepper® Cherry. Est. 1885. Naturally & artificially flavored. 0 Calories per 12 fl oz serving. 2 Liters (2.1 qt). Caffeine content: 39mg/12 fl oz. Please recycle. Consumer Comments 1-888-DRPEPPER. www.drpepper.com. ©2017 Dr Pepper/Seven Up, Inc.