Matcha Extract
Commonly used for
FocusEnergy
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The cheapest product is usually low quality, but more expensive doesn’t always mean better.
What is it? / Overview
Matcha delivers EGCG (antioxidant), L-theanine (promotes alpha brain-wave activity and relaxation), and caffeine (alertness) together -- the theanine-caffeine combination is thought to improve attention and mood while smoothing out caffeine's harsher edge, per small acute and longer-term trials.
How is it used? / Administration
Form: Matcha (shade-grown, stone-ground whole green-tea leaf powder) -- rich in EGCG, L-theanine, and caffeine
Typical dose studied: ~2 g/day in cognitive/sleep studies; up to ~4 g acutely in mood/attention studies
Timing: Daytime, given the caffeine content
Distinguish from concentrated green-tea-extract (high-EGCG) supplement products, which carry a separate, better-documented hepatotoxicity signal at high doses -- matcha at ordinary culinary/supplement doses is a different risk profile.
How well does it work? / Evidence
? Emerging / limited evidence
Who should avoid it?
Avoid with: Generalized anxiety disorder; Atrial fibrillation / Atrial flutter; Chronic insomnia disorder; Primary hypertension / High blood pressure; End-stage liver disease / Cirrhosis
Interacts with: Other stimulants/caffeine sources -- additive effect, track total caffeine intake; Nadolol and other CYP1A2-affected drugs -- theoretical interaction; Non-heme iron supplements -- catechins can reduce absorption if taken together
Already taking it? Reasonable to continue -- effects are modest and largely driven by the caffeine plus L-theanine combination (theanine promotes a calmer form of alertness than caffeine alone). Concentrated green-tea-extract products (much higher EGCG dose than a cup of matcha) carry a separate, documented hepatotoxicity signal worth being aware of.
Research & references
Uchida K et al. (2024). Effect of Matcha Green Tea on Cognitive Functions and Sleep Quality in Older Adults With Cognitive Decline: A Randomized Controlled Study Over 12 Months. PLoS One. Dietz C et al. (2017). An Intervention Study on the Effect of Matcha Tea, in Drink and Snack Bar Formats, on Mood and Cognitive Performance. Food Research International.
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