The Essentials

Trials pooled together show modest reductions in total and LDL (the harmful type of cholesterol) cholesterol with daily green tea or its extracts.

Long-term studies following people in Japan and China link regular drinking (~3–5 cups/day) with lower heart and blood vessel mortality.

L-theanine + caffeine (roughly 2:1) produces calm, focused alertness — measurable on attention and reaction-time tasks.

Concentrated EGCG extracts (>800 mg/day) carry hepatotoxicity (liver damage) risk. The brewed leaf at cup doses doesn't.