Proven · 7.9/10
L-Theanine
L-Theanine is the calming amino acid from tea. It works best as an alert-calm stack with caffeine, where trials such as Owen 2008, Giesbrecht 2010, Kelly 2008, and Haskell 2008 support attention and reaction-time benefits beyond caffeine alone. Standalone benefits are more modest: stress and sleep look real but not guideline-grade, with newer reviews from Bulman 2025, Cotter 2026, and Moshfeghinia 2024 strengthening but not closing the evidence gaps. Read the full breakdown →
The prediction game
Where does L-Theanine go in 12 months?
Lock a call and say how sure you are. Right and confident earns the most; a leaderboard spot is the prize. No money, no stakes.
The Crowd’s Call
Rising or fading over the next 12 months? Lock your call and find out if you saw it coming.
Be the first scout on record for L-Theanine. Permanent credit on this page, plus points when your call resolves.
One call per intervention. It locks the moment you submit (no edits, no cancels) and resolves in 12 months. See the scout leaderboard →
Weigh In
Your input feeds the community signal shown beside my verdict. It informs the board and it never sets the score by itself. How community input works.
Same as above — one verification covers all your entries here.
For education only, not medical advice. Supplements, peptides, and protocols can interact with medications and conditions. Talk to a qualified clinician before starting anything here.