(WTVR) -- If you need your daily coffee fix every morning, you may be getting more caffeine than you thought. Just one "Venti" coffee from Starbucks has about 330 miligrams of caffeine, according to a report in the National Post. A health daily dose of caffeine is 400 mg a day, according to the report.
A medium Dunkin' Donuts cup of coffee has about 178 milligrams of the country's most popular stimulant.
The report said that out of all major coffee chains, Starbucks is the most caffeinated.
According to the Mayo Clinic, a moderate does of caffeine is between 200 to 300 milligrams. Heavy caffeine use is more than 500 to 600 milligrams a day, about four or more cups.