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Green tea caffeine - how much is in it?
Green tea caffeine content depends largely on the size and type of the tea leaf used. That is, the larger the leaf, the less caffeine. Also, the more steepings, the less caffeine you have. The less green tea leaf you use, the less caffeine content it has. The shape and size of your brewing vessel will also influence caffeine content, that is, the larger thea area of circulation, the more caffeine will be drawn from the green tea leaves. Leaves of green tea plants grown under shade will develop more caffeine in them than those grown in the open. The highest green tea caffeine levels are found in the top two leaves and a bud, whereas green tea leaves picked from the lower parts of the bush, such as bancha green tea, have much less caffeine content than those picked from the higher parts. Genmaicha, which is half brown rice, will have less caffeine content than one that's all tea. Green teas that are processed by high firing(in a hot wok) have less caffeine than those processed more slowly. The good news is that, green tea as compared to black teas, coffee or soda, has a very steady stimulating effect. It does not make you feel nervous or even jittery. No nervousness, no annoying headaches, nothing! You have learned that how you prepare your green tea affects its caffeine content. You also found out that its levels vary between types of tea. The average cup of brewed coffee provides 60 to 160 mg of caffeine, a can of soda provides approximately 40 to 70 mg, and brewing a cup of black tea results in 20 to 90 mg, oolong has 10 to 45 mg and green tea caffeine is 6 to 30 mg.
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