Green Tea Leaf
However, even the green teas with the highest caffeine content are much gentler on the body and the adrenals than coffee, the reason
being that the caffeine is bound to the tannins in the tea, which ensures a
somewhat slower rush of caffeine into the blood. The result is a much
gentler and more sustained energy boost, compared to coffee and black tea.
Also, you won't experience the energy downs you get from coffee, when the
rush of caffeine suddenly stops as abruptly as it started. So for those
having trouble getting through the day without coffee, which stresses the
body's biochemistry, green tea is not merely an alternative, but an
improvement. It can do what you want from coffee, but it has none of the
negative effects.
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Green tea contains extremely powerful antioxidants, a range
of catechins in particular, which protect against health problems such as
cancer and cardiovascular disease. It also contains varying amounts of
caffeine bound to tannins; the caffeine content depends on where the tea is
grown. For some types of tea, the caffeine content is comparable to that of
coffee.