L-Theanine
(green tea)
“El Tea niño”
What it isAn amino acid from green tea, structurally related to glutamate, taken as a calming supplement.
Why this oneIt promotes relaxation without sedation — the caffeine-smoothing companion in tea — with small trials in anxiety and sleep quality.
What limits itIt is a supplement with supplement-grade evidence: effects are gentle and inconsistent across studies.
Available strengths
- cap 100, 200 mg
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