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    Caffeine in tea
    Caffeine is one the component of tea and all types of tea (except for herbal) contain caffeine. However, the amount of caffeine varies according to type. In general, Green tea contains the least caffeine, Black tea the most, and Oolong falls in the middle range.

  • A cup of Green tea (6 oz) contains 8 to 36 mg of caffeine.
  • A cup of Oolong tea contains 12 to 55 mg of caffeine.
  • A cup of Black tea ranges from 25 - 110 mg.
  • Coffee generally contains 60 - 180 mg of caffeine.

    Caffeine is not all bad. In moderate quantities, caffeine stimulates the central nervous system and promotes blood circulation. It stimulates the process of elimination and acts as a diuretic promoting better kidney function. There is some evidence that regular tea drinkers have a lower incidence of kidney ailments and gallstones. Caffeine has also been shown to speed reaction time, increase alertness, and improve concentration.

    Caffeine is water soluble and released from tea leaves in the very first part of the brewing process. To remove most of the caffeine from tea, brew the tea as normal, then pour off the liquid, add new hot water to the wet leaves, and brew for the usual amount of time. The flavor of any second steeping is less than that of a first steeping.

    Water temperature and steeping time can result in different caffeine amount released from tea.
    Water temp. (c) Caffeine Released (%)
    Percentage of caffeine released
    against water temperature (c).
    Steeping time (minutes) Caffeine Released (%)
    Percentage of caffeine released
    against steeping time (minutes).

    Note: As beverages vary widely according to the way they are made, all figures provided herewith are approximate.

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