L-Theanineand Stress.
Evidence gradeA
ImpactModerate
Confidencehigh
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
l-Theanine reduces psychological and physiological stress responsesK. Kimura · Biological Psychology2007Safety 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 Therapy2024Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled TrialS. Hidese · Nutrients2019