Great question — answering as the UphillTech team:
There are two main traits of tea which deliver the punch you talk about: Caffeine: this is a stimulant, and there is wide variation on the amount of caffeine in black teas depending on a number of factors. Here is a good article which goes into some detail on caffeine in tea. A simple way to put it is that variety doesn't mean much, one assam may have much more caffeine than another, so saying a tea is a blend of assam and ceylon doesn't mean it has more or less caffeine than pure assam. Flavor: A stronger flavored drink provides more stimulation to the brain than a weaker flavored drink. The more something attacks your taste buds the more wake-up power it has. Orange juice has no caffeine...
Full answer by GdD: https://cooking.stackexchange.com/a/70541 (CC BY-SA 3.0).
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