Green Tea caffeine can be very difficult to assign an exact amount to. Length of brewing time affects caffeine content - the longer the brew - the higher the caffeine. The Journal of Food Science evaluated different brands of green tea and had extremely varied results using the same amount of tea leaves brewed for 3 minutes.
Some are listed in the table on this article's website.
As a general rule, Green Tea has less caffeine than Black Tea, but can vary depending on which brand/type chosen. Another study showed that Green Tea (in Japan) has 30mg caffeine per 200ml cup.
Green tea is also high in the amino acid L-theanine. This has a calming effect and aides with concentration, so there's a myth that green tea has more caffeine than coffee but it's most likely that the L-theanine is responsible for the level of alertness felt when drinking green tea. Read the entire article.
Another great article from LiveStrong.com shows the concentration and memory power of green tea.
If you want the benefits of green tea without having to drink it, you can take it in capsules as Green Tea Extract with more potency than just a cup of tea.
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