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Head-to-head evidence comparison — which supplement is right for you?
L-Theanine vs Valerian Root: L-Theanine has the stronger overall evidence (6 vs 5.5/10); they're alternatives for reduce anxiety & stress — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
L-Theanine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
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
and 1 more not shown
30-60 minutes
30-60 minutes
30-60 minutes
Varies
2-4 weeks
2-4 weeks
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) · Review
Passionflower and Valerian Root alleviate anxiety and hyperactivity through GABAergic pathways.
Single-dose trials of L-theanine alone. In a crossover trial of 27 young adults given 100, 200 and 400 mg (PMID 32777998), only 400 mg shortened the P3b attention signal, and no dose changed reaction time. In a crossover trial of 20 healthy men, 200 mg improved recognition reaction time (PMID 26869148). In a crossover trial, 250 mg alone raised headache ratings and lowered correct serial subtractions, and the benefits came with caffeine (PMID 18006208). Most cognitive gains in this literature are for L-theanine combined with caffeine, which this curve does not show. The 400 mg ceiling rests on an 8-week trial of 80 schizophrenia inpatients, where side effects at 400 mg a day matched placebo (PMID 37697164). No trial found a best dose.
The two points come from two separate placebo-controlled trials, not from one trial comparing doses. 400 mg of aqueous root extract, taken on separate test nights, shortened self-rated sleep latency and improved sleep quality in 128 people, most clearly in poor or irregular sleepers (PMID 7122669). 530 mg of root extract nightly for 30 nights improved Pittsburgh sleep quality scores after heart bypass surgery in 72 patients, with no change in prothrombin time (PMID 33420602). The extracts and populations differ, so the curve is drawn flat and cannot show whether 530 mg does more than 400 mg. The cited meta-analyses found subjective improvement but give no per-trial doses (PMID 17145239, 33086877). No higher nightly dose for sleep was tested in a cited trial.
AI-estimated from published studies. Interpret as directional guidance.
L-Theanine has a higher evidence score (6/10 vs 5.5/10) and wins in 3 of 3 categories.
For reduce anxiety & stress, L-Theanine has a higher relevance score (85 vs 60).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
Caffeine+L-theanine works; bacopa needs weeks; most "brain pills" are hype. The honest tier list.
Ashwagandha, L-theanine, magnesium, saffron — what actually helps stress, and the safety caveats.
Melatonin, magnesium, glycine, L-theanine — tiered by evidence, plus a wind-down timeline.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.