Nutrition & Food The AHA Says Coffee Is Safe to Five Cups a Day. The Energy Shot's Problem Isn't the Caffeine.
Up to 400 mg a day, roughly three to five cups of regular black coffee, is generally safe for most adults and may be linked to lower cardiovascular risk. The concentrated shot in the gym-bag can is a different animal, and the reason isn't the caffeine.
By Sarah Okonkwo · July 23, 2026