Research summaries

Tea & wellness

Caffeine amounts, L-theanine, and tea-versus-coffee comparisons — written from published research themes.

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Jul 16, 2026 Caffeine Matcha Green tea

Caffeine by Tea Type: How Much Is in Your Cup

Caffeine ranges by tea type — matcha, black, oolong, green, white, pu-erh — plus brew variables and a comparison table. Research summary only.