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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
Mostly mechanism / observational
Top outcomes
Verdict
Likely helps
4 of 5 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Gotu Kola and L-Theanine have evidence — compare verdict strength side-by-side.
500-1000mg extract (or 1-2g dried herb)
With meals, Split into 2-3 doses
Standardized extract (triterpene content)
100-200mg
Morning with coffee for focus, Evening for relaxation, As needed for stress
Suntheanine® capsules or powder
4-8 weeks
2-4 weeks
4-8 weeks
30-60 minutes
30-60 minutes
30-60 minutes
Varies
Herbal Therapeutics for Alzheimer's Disease: Ancient Indian Medicine System from the Modern Viewpoint
Current neuropharmacology (2023) · Systematic review
A rich knowledge base of traditional herbal plants (Turmeric, Gingko, Ashwagandha, Shankhpushpi, Giloy, Gotu kola, Garlic, Tulsi, Ginger, and Cinnamon) combined with modern science could suggest new functional leads for Alzheimer's drug discovery.
Neuroprotective Herbs for the Management of Alzheimer's Disease
Biomolecules (2021) · Systematic review
Methods-This article systematically reviews recent studies that have investigated the role of neuroprotective herbs and their bioactive compounds for dementia associated with Alzheimer's disease and pre-Alzheimer's disease.
The Safety and Efficacy of Botanicals with Nootropic Effects
Current neuropharmacology (2021) · Systematic review
Overall, nearly one-quarter (23%) of adults currently take a supplement to maintain or improve brain health or delay and reverse dementia.
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).
Based on single small RCT (n=40) showing reduced acoustic startle response. Limited clinical evidence for anxiolytic effects.
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.
AI-estimated from published studies. Interpret as directional guidance.
L-Theanine has a higher evidence score (6/10 vs 4.2/10) and wins in 3 of 3 categories.
For reduce anxiety & stress, L-Theanine has a higher relevance score (85 vs 70).
No known interactions between Gotu Kola and L-Theanine have been documented in our database. However, always consult a healthcare provider before combining supplements.