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Head-to-head evidence comparison — which supplement is right for you?
L-Theanine wins 2 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
2 of 2 studies with measurable effects showed benefit.
Top outcomes
100-200mg
Morning with coffee for focus, Evening for relaxation, As needed for stress
Suntheanine® capsules or powder
350-450mg dried herb OR 1-2ml tincture (1:5), up to 3x daily
Before bed for sleep, During day for anxiety as needed
Fresh plant tincture (most traditional)
30-60 minutes
30-60 minutes
30-60 minutes
Varies
30-60 minutes
30-60 minutes before bed
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).
Baicalin and baicalein against myocardial ischemia-reperfusion injury: A review of the current documents
Tissue & cell (2025) · Systematic review
Research in both animal and cell models suggests that these flavonoids, especially baicalin, can restore cardiac health following MIRI, improving cardiac performance, and reducing cardiac damage.
Promising Role of the Scutellaria baicalensis Root Hydroxyflavone-Baicalein in the Prevention and Treatment of Human Diseases
International journal of molecular sciences (2023) · Systematic review
It has been documented that the extract of Baikal skullcap (Scutellaria baicalensis) has hepatoprotective, calming, antiallergic, and anti-inflammatory properties.
Wogonin and its analogs for the prevention and treatment of cancer: A systematic review
Phytotherapy research : PTR (2022) · Systematic review
WOG, in combination with established chemotherapeutic drugs, improves the efficacy of treatment and lowers toxicity.
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 single crossover RCT (n=43) showing significant group effect for mood in healthy volunteers. Study population was relatively non-anxious (81% mildly anxious or less). Carryover effects noted. Limited evidence base requires further validation in clinical populations.
AI-estimated from published studies. Interpret as directional guidance.
L-Theanine has a higher evidence score (9/10 vs 5.5/10) and wins in 2 of 3 categories.
For reduce anxiety & stress, L-Theanine has a higher relevance score (85 vs 75).
No known interactions between L-Theanine and Skullcap have been documented in our database. However, always consult a healthcare provider before combining supplements.