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  2. Caffeine - Wikipedia

    en.wikipedia.org/wiki/Caffeine

    Caffeine's biological half-life – the time required for the body to eliminate one-half of a dose – varies widely among individuals according to factors such as pregnancy, other drugs, liver enzyme function level (needed for caffeine metabolism) and age. In healthy adults, caffeine's half-life is between 3 and 7 hours. [5]

  3. Paraxanthine - Wikipedia

    en.wikipedia.org/wiki/Paraxanthine

    Paraxanthine is believed to exhibit a lower toxicity than caffeine and the caffeine metabolite, theophylline. [ 22 ] [ 23 ] In a mouse model, intraperitoneal paraxanthine doses of 175 mg/kg/day did not result in animal death or overt signs of stress; [ 24 ] by comparison, the intraperitoneal LD50 for caffeine in mice is reported at 168 mg/kg ...

  4. Biological half-life - Wikipedia

    en.wikipedia.org/wiki/Biological_half-life

    Caesium in the body has a biological half-life of about one to four months. Mercury (as methylmercury) in the body has a half-life of about 65 days. Lead in the blood has a half life of 28–36 days. [29] [30] Lead in bone has a biological half-life of about ten years. Cadmium in bone has a biological half-life of about 30 years.

  5. Everything You Need to Know About Caffeine—Including ... - AOL

    www.aol.com/everything-know-caffeine-including...

    Caffeine starts interfering with adenosine relatively quickly; it is absorbed by the small intestine and has its peak effect within 30 minutes or so, depending on multiple factors including how ...

  6. You Might Be Consuming Too Much Caffeine - AOL

    www.aol.com/might-consuming-too-much-caffeine...

    Of course, caffeine shows up in some foods, too. Dark chocolate (70% to 85%), for example, contains more than 22 milligrams of caffeine per ounce, according to the U.S. Department of Agriculture ...

  7. Caffeine (data page) - Wikipedia

    en.wikipedia.org/wiki/Caffeine_(data_page)

    Caffeine Properties Chemical formula. C 8 H 10 N 4 O 2: Molar mass: 194.194 g·mol −1 Appearance Odorless, white needles or powder Density: 1.23 g/cm 3, solid [1 ...

  8. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.

  9. How Much Caffeine Is Too Much? - AOL

    www.aol.com/drinking-too-much-caffeine-204000420...

    Caffeine does not give you energy, just delays fatigue for a little while longer.” In other words, that 2 p.m. cup of coffee is just delaying the inevitable. At first, caffeine might appear to ...