L-theanine and sleep questionnaires
Ingredient study. Not a clinical trial of MP-MA.
- Study
- Hidese et al., 2019 · randomized, placebo-controlled crossover trial
- Population
- 30 healthy adults
- Intervention
- 200 mg L-theanine per day, 4 weeks per treatment period
- Outcome
- Several sleep-questionnaire subscales improved compared with placebo. The overall sleep-quality score did not show a statistically significant between-treatment difference.
- Comparison
- Placebo (crossover design)
- Relation to MP-MA
- The named ingredient and amount match MA’s label: 200 mg L-theanine per 3-capsule serving. This small trial tested L-theanine on its own, not MA, and was funded by the ingredient supplier.





