Paraxanthine is the main metabolite of caffeine. Studies suggest it can boost alertness and focus, but the research base is ...

Coffee does more than wake you up. Discover 15 surprising and weird effects coffee can have on your body, from brain function to digestion.

For many, caffeine is the ultimate pick-me-up. Whether it's a cup of coffee, a can of energy drink, or a quick espresso shot, it fuels the day and keeps us moving. But even though caffeine is a common ...