A double espresso dumps its whole load at once. Your blood-caffeine level shoots up, your cortisol climbs with it, and for about an hour, you feel sharp. Then the level falls off a cliff. So you reach for the next cup — and run the spike again.
Tea does the opposite. Five short steeps from the same leaves release the caffeine in small pulses — a little at a time, across the better part of an hour. No single pulse is big enough to spike you. But each one tops up the last before it fades, so the alert feeling holds steady for three to four hours instead of one.
That's the whole idea. Not less caffeine. The same caffeine, spread out — so the line stays in the useful zone and never climbs into the spike that costs you the afternoon.
There's a number behind this. European food-safety reviewers found that, owing to its caffeine, this tea sharpens attention once a serving clears about 75 mg in the first 90 minutes. A morning tea session lands there.‡ A single Western mug, steeped once, usually doesn't — which is why "just drink tea" never worked for you before. The leaf has to be brewed in sessions to deliver the dose. That's the part the protocol gets right.
One honest note, because you'd find it yourself. Tea also carries L-theanine, the compound people credit for the "smooth" feeling. In a single-dose study, it measurably lowered the stress hormone an hour later. But when researchers ran the same thing for 28 days, the long-term effect didn't hold up to their bar. So here's the line we will not cross: we are not claiming this tea fixes your anxiety over weeks. We're claiming one thing the evidence actually supports — a steadier ride on the same caffeine. The biggest review to date, 50 trials, lands in the same place: the attention lift comes from the caffeine, delivered well.