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The science behind caffeine

Brain Science: Neuroscience, Behavior

CHAPTER

Is Caffeine Really Safe?

Caffeine is not safe if you have more than 400 milligrams in a day. It can help your heart as long as you stay under 300 milligrams per day. Moderation and also being strategic are key to getting the most out of it, says Dr. Sanjay Gupta.

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