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Head-to-head evidence comparison — which supplement is right for you?
L-Theanine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
3 of 4 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (3)
Outcomes where both L-Theanine and Valerian Root have evidence — compare verdict strength side-by-side.
100-200mg
Morning with coffee for focus, Evening for relaxation, As needed for stress
Suntheanine® capsules or powder
300-600mg extract
30-60 minutes before bed
Standardized extract capsules
30-60 minutes
30-60 minutes
30-60 minutes
Varies
2-4 weeks
30-60 minutes
Next morning
Immediate
The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
Sleep medicine reviews (2025) · Meta analysis · n=897
The findings indicate the potential use of L-theanine in the management of sleep disturbances; however, the lack of studies on "pure" L-theanine warrants further investigation.
Efficiency of Different Supplements in Alleviating Symptoms of ADHD with or Without the Use of Stimulants: A Systematic Review
Nutrients (2025) · Systematic review
The evidence revealed the potential use of supplements as complementary ADHD treatments under clinical guidance.
Analysis of the Effects of Known Sleep-Support Supplements in Relation to Life Habits, Sleep Conditions, and Sleep Problems
Nutrients (2023) · Rct · n=160
All the tested supplements were found to ameliorate sleep problems significantly (Analysis 1).
Valerian Root in Treating Sleep Problems and Associated Disorders-A Systematic Review and Meta-Analysis
Journal of evidence-based integrative medicine (2020) · Meta analysis · n=6894
In addition, therapeutic benefits could be optimized when it was combined with appropriate herbal partners.
Fixed herbal drug combination with and without butterbur (Ze 185) for the treatment of patients with somatoform disorders: randomized, placebo-controlled pharmaco-clinical trial
Phytotherapy research : PTR (2009) · Rct · n=182
Analysis of the ITT population confirmed these results.
Herbal Medicines in Autism Spectrum Disorder: Therapeutic Potential, Plant Components, and Dosage Guidelines
Alternative therapies in health and medicine (2025) · Systematic review
Systematic review examining Valerian Root efficacy
Meta-analysis (n=897) and multiple RCTs support sleep benefits. Studies often used L-theanine in combination with other compounds, limiting pure L-theanine effect attribution. Effects include reduced sleep onset latency and improved subjective sleep quality.
Based on meta-analysis (n=1602) showing statistically significant improvement in subjective sleep quality but no improvement in objective polysomnography measures. Effect magnitude is conservative given mixed objective evidence.
AI-estimated from published studies. Interpret as directional guidance.
L-Theanine has a higher evidence score (9/10 vs 7/10) and wins in 3 of 3 categories.
For reduce anxiety & stress, L-Theanine has a higher relevance score (85 vs 60).
No known interactions between L-Theanine and Valerian Root have been documented in our database. However, always consult a healthcare provider before combining supplements.