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But even 40 mg of caffeine â about the amount in a cup of tea or a can of soda â will give most people a subtle boost. In fact, many people can detect the effects of just 15 mg of caffeine, about the amount in a single sip of strong coffee or a large cup of decaf.
Most other sodas range from about 25 milligrams to 45 milligrams per serving. For instance, Diet Coke has 45.6 milligrams, while Dr. Pepper has 41 milligrams. Coke Classic, on the other hand, has 34 milligrams. A number of sodas do not have any caffeine and include Sprite, A&W Root Beer, 7UP and Mug Root Beer.