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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.
The Starbucks coffee with 'three quarters of the safe daily dose' in one cup. 1  400mg of caffeine is the recommended daily allowance for average person. 2  16oz Starbucks 'Grande' contains 330mg, according to study. 3  But scientists stress that tolerance levels of the stimulant can vary widely.