L-Theanine
(green tea)
“El Tea niño”
What it isAmino acid from green tea, structurally related to glutamate, taken as a calming supplement.
Why this onePromotes relaxation without sedation — the caffeine-smoothing companion in tea — with small trials in anxiety and sleep quality.
What limits itSupplement-grade evidence; gentle effects, inconsistent across studies.
NO BOXED WARNINGS
Principal riskNo boxed warning; evidence for the promoted stress and sleep uses is thin
Classes and tags
Clinical profile
Defining liabilityLimited standardized therapeutic and long-term safety evidence
Available strengths
- cap 100, 200 mg
Open L-Theanine in the interactive console ↗
Self-check
- How consistent are L-theanine’s effects across studies?
Inconsistent. - Which beverage supplies L-theanine?
Green tea.