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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.
The caffeine content ranged from 8.6 milligrams to 13.9 milligrams. That's about a tenth of the caffeine found in an 8-ounce cup of regular drip-brewed coffee, which contains about 85 milligrams of caffeine.