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  • Caffeine - Wikipedia
    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
  • Caffeine: What It Is, Benefits and Side Effects
    What is caffeine? Caffeine is a type of drug called a stimulant, meaning it increases chemicals in your brain called neurotransmitters
  • Caffeine - Zhorn Software
    If you have problems with your PC locking or going to sleep, caffeine will keep it awake It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver
  • Caffeine: How much is too much? - Mayo Clinic
    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
  • What Is Caffeine, and Is It Good or Bad for Health?
    Caffeine is a natural stimulant consumed throughout the world This article reviews caffeine and its health effects, both good and bad
  • Caffeine - The Nutrition Source
    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
  • Caffeine: How Long Do Its Effects Last? - WebMD
    Learn more about how long caffeine lasts, along with the pros, cons, and potential health risks
  • Spilling the Beans: How Much Caffeine is Too Much? | FDA
    Caffeine can be part of a healthy diet for most people, but too much caffeine may pose a danger to your health Know your limits and the products that may contain caffeine
  • Caffeine | Stimulant, Health Benefits, Addiction | Britannica
    Learn about caffeine's effects on the human body Caffeine has a stimulating effect on the central nervous system, heart, blood vessels, and kidneys It also acts as a mild diuretic Caffeine’s potent stimulatory action makes it a valuable antidote to respiratory depression induced by drug overdose (e g , from morphine or barbiturates)
  • Caffeine - MedlinePlus
    Many people enjoy a cup of coffee or tea to give them a boost But is it safe? Learn more about caffeine





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