The point is the curve, not the kick. Caffeine alone braces you: heart rate up, slightly wired. L-theanine raises the relaxed-alert state, so the two together give you focus without the jitter around it ¹. A bowl delivers them at roughly a 2:1 ratio, the band the trials use.

The rest is slow. The catechins, EGCG chief among them, nudge how the gut absorbs cholesterol and how blood vessels relax — a small daily bias that only shows up over months.

Two things are well studied. The smoother focus is solid: a single normal dose improved attention-switching and reaction time an hour later ², and caffeine-plus-theanine beats caffeine alone across trials ³.

The heart numbers are real but small. Daily catechins drop LDL a couple of mg/dL ⁴; systolic blood pressure falls roughly 2 mmHg ⁵. Consistent across populations, too small for your doctor to flag. No trial has run long enough to show fewer heart attacks ⁶.

One to two grams whisked into 60–80 ml of water at 70–80°C. Boiling water tastes burnt. The powder suspends rather than dissolves, so drink it within a few minutes.

What the switch feels like over time.

• Week one: the 11am second coffee stops calling. There's no peak to fall off, so nothing to recover from.
• Weeks two to four: the smoothness becomes normal, and people stop reading you as wired ¹.
• Months one to three: sleep improves — not from the matcha, but because you quit caffeine after 2pm.
• Six to twelve months: on two bowls a day, LDL and systolic move down a hair ⁵. Too small to see year to year; a compounding input over a decade.