Green tea綠茶
Signature ingredient: L-Theanine — B-grade evidence (Sleep Quality, ~12% of the studied dose per serving)
Standard nutrients per USDA FoodData Central · phytochemicals (lutein / K2 / sulforaphane etc.) are literature estimates, varying by variety and processing
S / A … ingredient evidence tier (tap for the claim) | bar = how much of the studied dose one serving of Green tea gives you
Meaningful intake one serving delivers a real fraction of the studied dose
Trace contribution far below the studied dose — not a therapeutic source
L-Theanine
25mg · Relaxation; one cup is far below the studied dose
B Sleep Quality →
＋ Anxiety C・Cognitive Function C
≈ 12% of studied dose
Why this page doesn't claim "Green tea works"
Whole foods almost never have RCTs — the evidence sits on the ingredients. So this page does one honest thing: it lists which graded ingredients Green tea contains, how much, and how far that is from the studied dose. It makes no efficacy claim about Green tea itself.
Bottom line: Green tea's L-theanine (relaxation) and caffeine (alertness) both have B-grade evidence, but one cup is far below the studied dose - don't expect a noticeable effect from a single cup. The catechin weight-loss/cancer-prevention claims have weak or even contradictory evidence.
Every tier links to its full evidence page · Methodology →