Journals

Guides, brewing notes and research from O2H TEA — how to choose, brew and actually enjoy Asian teas, written for Australian drinkers. No ceremony, no gatekeeping, no jargon.

All matcha
Sencha Japanese green tea brewing in Japanese zen room — an O2H Tea guide to sencha
What Is Sencha? A Melbourne Guide to Japan's Everyday Green Tea

Quick answer: Sencha is the most widely drunk green tea in Japan — a whole-leaf tea made from Camellia sinensis...

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Tea for Focus — O2H TEA guide to L-theanine and caffeine
Tea for Focus and Concentration: L-Theanine + Caffeine Science (2026)

A note on health information: This article is for general information only and is not medical advice. ADHD is a...

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