Here's How Much Caffeine Is In A Regular Cup Of Coffee Vs. An Espresso Shot

We've reviewed the best espresso, bean-to-cup and drip coffee machines around to get your caffeine fix ...

The Conversation: Plunger, espresso, filter? Just because your coffee is bitter, doesn’t mean it’s ‘stronger’

Coffee – one bean with many possibilities. A big choice is how to brew it: espresso, filter, plunger, percolator, instant and more. Each method has unique equipment, timing, temperature, pressure, and ...

Plunger, espresso, filter? Just because your coffee is bitter, doesn’t mean it’s ‘stronger’

The most common sources of caffeine for human consumption are the tea leaves of the Camellia sinensis plant and the coffee bean, the seed of the Coffea plant. Some people drink beverages containing caffeine to relieve or prevent drowsiness and to improve cognitive performance.

Up to 400 milligrams (mg) of caffeine a day seems safe for most adults. That's about the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks. Keep in mind that the caffeine content in drinks varies widely.

Caffeine is a natural chemical with stimulant effects. It is found in coffee, tea, cola, cocoa, guarana, yerba mate, and over 60 other products. Caffeine works by stimulating the central...

Although we tend to associate caffeine most often with coffee or tea, the research below focuses mainly on the health effects of caffeine itself. Visit our features on coffee, tea, and energy drinks for more health information related to those beverages.