Sleep / L-theanine
L-theanine
Evidence for sleep, scored from the published research.
sleep quality
promising73/100 Evidence ScoreConfidence: high4 studies3 RCTs
Multiple human studies report a positive effect.
- 3 human studies (229 participants total)
- Studies point in broadly the same direction
References (4)
- Effect of a Combination of Magnesium, B Vitamins, Rhodiola, and Green Tea (L-Theanine) on Chronically Stressed Healthy Individuals-A Randomized, Placebo-Controlled Study.randomized controlled trial (RCT) · Nutrients · 2022
- Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.randomized controlled trial (RCT) · Nutrients · 2019
- Effect of matcha green tea on cognitive functions and sleep quality in older adults with cognitive decline: A randomized controlled study over 12 months.randomized controlled trial (RCT) · PloS one · 2024
- GABA and l-theanine mixture decreases sleep latency and improves NREM sleep.animal study · Pharmaceutical biology · 2019
Evidence Scores are computed mechanically from the published research (PubMed / Semantic Scholar / OpenAlex): study design, participant numbers, and consistency across studies. An LLM is used only to extract study data, never to decide a score.
This is research-based information, not medical advice, and not a diagnosis. Consult a qualified professional about your own situation.