L-theanine evidence, 2019
Hidese S, Ogawa S, Ota M, et al., Nutrients, 2019 — RCT of 200 mg/day L-theanine for 4 weeks
- Grade
- Design
- rct
- Year
- 2019
- Participants
- 30
- Ingredient
- L-theanine
- Goal
- Stress
Effect
Four weeks of 200 mg/day lowered stress-scale scores and improved sleep-quality subscores versus placebo in healthy adults.
Limitations and notes
Small n; consistent with the acute-dose literature.