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The Journal

Field Notes on Focus

Short, readable pieces on L-theanine, caffeine and what’s actually in your can.

Science

L-Theanine + Caffeine: Why They Work Better Together

Why caffeine with L-theanine feels different from coffee on its own, and what the studies say about the pairing.

Jun 2026 · 6 min read

Explainer

What Is L-Theanine? A Simple Guide

You’ve had it in every cup of green tea. What L-theanine is, where it comes from, what it does in the brain, and whether it’s safe.

Jun 2026 · 5 min read

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