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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.
The caffeine levels in coffee are significantly higher than those in most popular sodas. The typical caffeinated soda has between 25 and 50 milligrams of caffeine. In comparison, a 6-ounce cup of arabica coffee has around 100 milligrams of caffeine, and a shot of espresso contains about 70 milligrams. (Coffea robusta has twice as much caffeine as coffea arabica.) Sometimes, it might seem like soda gives you more energy than a cup of coffee.