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Toxic doses, over 10 grams per day for an adult, are much higher than typical doses of under 500 milligrams per day. A cup of coffee contains 80â175 mg of caffeine, depending on what bean (seed) is used and how it is prepared (e.g. drip, percolation, or espresso). Thus it requires roughly 50â100 ordinary cups of coffee to reach a lethal dose.
Everyone knows you can find plenty of caffeine in regular coffee (80-150 milligrams in a 6-ounce cup of brewed coffee). But you might be surprised to find as much (or more) caffeine in energy drinks, sodas -- even gum and ice cream. Coffee-flavored frozen yogurt and ice cream is also suspect, with anywhere from 45 to 85 milligrams of caffeine per cup, depending on the brand.