L-Theanineand Sleep quality.
Evidence gradeB
ImpactModerate
Confidencemedium
Imported rating. This grade comes from SuppCo and has not been independently reviewed. It describes research, not a product, and it is not medical advice.
The rating
- Direction
- Favourable
- Rated by
- SuppCo
- Observed
- 28 September 2026
Studies behind it
The Effects of L-Theanine Supplementation on Quality of Sleep: A Systematic ReviewAmanda Bulman · The 14th European Nutrition Conference FENS 20232023Safety and Efficacy of AlphaWave® l-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo-Controlled TrialMarc Moulin · Neurology and Therapy2024Effect of a nutraceutical combination on sleep quality among people with impaired sleep: a randomised, placebo-controlled trialS. A. Gutiérrez-Romero · Scientific Reports2024