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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.
How many milligrams of caffeine are in a cup coffee how much is coffee? Center for science the public interest. That 8 ounce cup of coffee has about 100 milligrams caffeine, although coffees and one 250ml can red bull energy drink contains 80 mg the same amount as in a standard. If your caffeine habit totals more than 400 milligrams (mg) a day, you may want to keep in mind that the actual conten