"For healthy adults, the FDA has cited 400 milligrams a day—that's about four or five cups of coffee—as an amount not generally associated with dangerous, negat

"For healthy adults, the FDA has cited 400 milligrams a day—that's about four or five cups of coffee—as an amount not generally associated with dangerous, negative effects." https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much https://www.fda.gov/consumers/consumer-updates/spilling-bean...