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To best minimize your risk, consume less than 100 milligrams of caffeine per day, or no more than 1 to 2 cups of coffee. Caffeine may also have adverse impacts in children, such as disturbing their sleep, and intake should be limited to 2.5 milligrams of caffeine per kilogram of their body weight per day.
Amount and Sources. Most adults can consume 200 mg to 300 mg of caffeine per day, which translates to two to four cups of coffee, without any health concerns or negative side effects.