$20.78 $0.17 per serving
Product analysis
Double Strength L-Theanine 200 mg may help relaxation and settling down. The clearest support concerns short-term calming, with sleep and attention effects less predictable.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
The linked preparation details identify L-theanine, although the form description is inconsistent. Inositol is less specific, leaving its comparative quality unclear.
Ingredient Transparency63
Both ingredient amounts are given, helping compare the combination. The preparation descriptions remain inconsistent or unspecified.
Value For Money88
The serving cost is favorable for the theanine supplied. Inositol does not have enough information for a separate value judgment.
Customer Satisfaction92
Customer ratings are very positive across a large body of feedback. They describe satisfaction rather than establishing health benefits.
Product Focus74
The clearest use is relaxation and settling down. Sleep and attention findings are less consistent, and do not establish a dependable boost in everyday output.
- Format
Capsule - Container
- 120 Capsule(s)
- Per serving
- $0.17
- Also available
Double Strength L-Theanine 200 mg$14.54- Customer rating
- 4.7 · 45,175 ratings
Goals
Impact
High effect
Theanine · 200 mg
Theanine may help with relaxation and tension during stressful tasks. The 200 mg selected serving meets the saved amount comparison and contributes to calming and sleep recovery findings. Sustained mood and anxiety results are mixed, so short-term relaxation does not establish lasting stress relief.
How this product is rated for Stress Relief
Ingredient fit92
Theanine gives this product a focused connection to stress relief and meets the saved amount comparison.
Goal fit
Theanine is the credited ingredient, with no off-goal actives counted; links to other goals modestly broaden the focus.
Dose adequacy
The selected serving's 200 mg theanine meets the full saved amount comparison.
Pathways71
Theanine contributes to neural calming and sleep recovery in the saved findings. Neural calming is the stronger route.
Depth
Neural calming is the best-covered route through theanine.
Breadth
Neural calming and sleep recovery meet the saved coverage target; other stress-related routes do not.
Evidence77
Theanine has direct stress-task and tension findings, and the saved preparation check is satisfied.
Evidence strength
Theanine supplies the relevant evidence at the selected amount, with direct findings for stress-task responses and tension.
Studied preparation
The saved check accepts theanine as a studied preparation at this amount.
Formulation logic100
Theanine can contribute alone, with no configured conflicts matched. Its serving amount passes the saved minimum check.
Partner coverage
Theanine does not require another ingredient to receive its contribution.
Conflicts
No configured ingredient conflict was matched in the supplied facts.
Effective doses
Theanine passes the minimum amount check for inclusion.
Impact
High effect
Theanine · 200 mg
Theanine may help sustained attention, based on a small standalone study measuring attention errors. Such test performance is a proxy for productivity and does not establish better work output. The 200 mg serving reaches the comparison plateau, which does not prove greater benefit than lower studied amounts or guarantee calming.
How this product is rated for Productivity Boost
Ingredient fit78
Theanine provides limited standalone attention-task support. The broader formulation is less focused on this goal.
Goal fit
Other declared actives and the product's wider goal links reduce its focus on productivity.
Dose adequacy
The relevant declared amounts receive full recognition; this does not establish an effective productivity dose.
Pathways60
Theanine contributes to the calm-attention category, without guaranteeing a calming effect.
Depth
Theanine contributes to the calm-attention category, without guaranteeing a calming effect.
Breadth
Only the calm-attention category reaches the coverage threshold.
Evidence74
Theanine provides the strongest retained evidence contribution. Standalone attention findings remain limited.
Evidence strength
Theanine provides the strongest retained contribution, without establishing better work output.
Studied preparation
The saved findings recognize the relevant preparations; this does not transfer results across different formulations or populations.
Formulation logic100
The retained ingredients require no missing partner, and no configured conflict was identified. Their amounts meet the minimum comparison threshold.
Partner coverage
No required ingredient partner is missing; this does not establish a combination advantage.
Conflicts
No configured conflict was identified in the supplied facts.
Effective doses
All retained ingredients meet the minimum amount threshold; that threshold is not a proven productivity dose.
Impact
High effect
Theanine · 200 mg
Theanine has mixed findings for selective attention: a small study found faster recognition responses, while other studies found no reaction-time gain or worse performance on a calculation task. This supports a limited connection to focus rather than a reliable improvement in everyday concentration.
How this product is rated for Mental Focus
Ingredient fit78
Theanine provides a main focus-related ingredient finding. Amounts and the wider formula limit the alignment.
Goal fit
Relevant focus ingredients are part of a formula with broader purposes.
Dose adequacy
The counted amount reaches the saved reference range, without proving a reliable attention benefit.
Pathways60
The strongest recorded connection concerns calm attention. Coverage is concentrated in calm attention.
Depth
The strongest recorded connection concerns calm attention.
Breadth
Coverage is concentrated in calm attention.
Evidence79
Theanine leads the saved evidence finding. Clinical outcomes remain limited to the populations and tasks studied.
Evidence strength
Theanine leads the saved evidence finding, with the population and measured outcomes limiting expectations.
Studied preparation
The counted material is recognized in the saved preparation finding; this does not establish identical clinical outcomes.
Formulation logic84
Theanine lacks the caffeine partner recognized by the saved combination finding; its limited standalone attention evidence still applies. No configured ingredient conflict was identified in the supplied findings.
Partner coverage
Theanine lacks the caffeine partner recognized by the saved combination finding; its limited standalone attention evidence still applies.
Conflicts
No configured ingredient conflict was identified in the supplied findings.
Effective doses
The counted ingredients clear the saved amount threshold; that threshold does not establish a proven focus dose.
Impact
Highest effect
Theanine · 200 mg
Theanine may help with settling down and some aspects of reported sleep quality. The 200 mg per serving matches the amount used in a small four-week adult trial, where some sleep measures improved. Those findings do not establish an immediate sedative effect. The supplied directions allow use as needed, so the serving is not assumed to represent the repeated daily regimen used in that study.
How this product is rated for Sleep Support
Ingredient fit78
Theanine provides the counted sleep-related contribution at a supported amount.
Goal fit
Theanine relates to sleep, while the broader formula and goal links reduce its sleep focus.
Dose adequacy
The 200 mg per serving receives full amount credit.
Pathways73
The saved findings cover calming and stress-related functions.
Depth
Calming is the strongest covered function.
Breadth
Calming and stress-related functions are covered; timing is not.
Evidence86
Theanine has limited support from small repeated-use studies.
Evidence strength
Theanine supplies the support here, based on small trials with limited sleep outcomes.
Studied preparation
The declared theanine preparation is accepted in the saved findings.
Formulation logic100
Theanine can contribute alone and meets the saved amount check.
Partner coverage
The counted ingredients can contribute without a required missing partner.
Conflicts
No configured ingredient conflict was identified in the supplied facts.
Effective doses
The counted ingredients have declared amounts that meet the saved minimum for a meaningful contribution.
Impact
High effect
Theanine · 200 mg
Theanine may help selected executive-function tasks through stress and arousal regulation. Its 200 mg per serving matches the exposure in the supplied small four-week trial, where cognitive improvement was limited to adults with lower starting performance. The saved result recognizes theanine's amount while finding the formulation less focused on cognition because of its additional ingredients.
How this product is rated for Cognitive Support
Ingredient fit78
The relevant ingredients receive amount recognition to varying degrees. Their cognitive relevance remains subject to the specific scientific limitations described above.
Goal fit
The relevant ingredients are accompanied by ingredients outside this goal, making the formulation less focused on cognition.
Dose adequacy
The recognized ingredient amounts reach the full saved exposure comparison; this does not establish additional cognitive benefit.
Pathways51
The saved findings associate stress and arousal regulation with this formulation, without establishing a demonstrated cognitive effect.
Depth
The main recognized connection is stress and arousal regulation; this finding does not prove improved cognitive performance.
Breadth
Only one specified pathway reaches the saved coverage threshold, giving a narrow range of connections.
Evidence81
Theanine provides the strongest recognized evidence contribution. The supplied scientific limitations still constrain expectations for cognitive benefit.
Evidence strength
Theanine supplies the strongest recognized evidence contribution, while the supplied context limits claims of routine cognitive improvement.
Studied preparation
The saved finding accepts the recognized preparations; this does not establish that all populations or outcomes would benefit.
Formulation logic100
The recognized ingredients have no missing partners or configured conflicts and meet the minimum amount threshold.
Partner coverage
The recognized ingredients meet the partner requirements without any missing required partner.
Conflicts
No configured ingredient conflict was identified in the supplied facts.
Effective doses
All ingredients included in this check reach its minimum amount threshold, which is not proof of an effective cognitive dose.
Impact
High effect
L-theanine may support calm attention in the short term. The 200 mg per serving matches the acute-study amount described in the supplied context. Small trials offer limited support for this specific role, rather than dependable improvement across memory or long-term brain health.
How this product is rated for Brain Health
Ingredient fit78
The relevant ingredients and their declared amounts support the specific roles described here, with the amount findings detailed below.
Goal fit
The formula includes relevant ingredients alongside other actives with different or unassessed roles.
Dose adequacy
The declared amounts fully meet the saved amount comparisons; this does not establish that each serving produces a cognitive benefit.
Pathways48
The supplied findings link the ingredients to the processes described below; those links are distinct from demonstrated cognitive outcomes.
Depth
The strongest assigned connection is stress and arousal regulation; this mechanistic connection does not itself establish improved cognition.
Breadth
One listed pathway has meaningful assigned coverage, so the connection is narrow.
Evidence78
The supplied evidence varies by ingredient, preparation and population. The findings below retain those distinctions.
Evidence strength
Theanine leads the saved evidence comparison, with benefits limited to the population and role described in the supplied context.
Studied preparation
The saved comparison recognizes the declared preparations; this does not establish that the product matches every study population or use pattern.
Formulation logic100
The supplied findings identify no unmet partner requirements or assigned conflicts, and the credited ingredients meet the minimum amount threshold.
Partner coverage
The credited ingredients have no unmet partner requirement in the supplied findings; this does not establish an added combination benefit.
Conflicts
No conflict was identified by the supplied checks; this is not a broader safety assessment.
Effective doses
All credited ingredients meet the saved minimum amount threshold, which is a comparison cutoff rather than a proven effective cognitive dose.
Impact
Moderate effect
L-theanine may help reduce tension after mentally demanding tasks, which can be useful when stress affects how you feel. This is a narrower benefit than improving persistent low mood. Whether it produces a sustained improvement in depressive symptoms is unclear, so its calming role shouldn't be read as an antidepressant effect.
How this product is rated for Mood Support
Ingredient fit92
L-theanine's most relevant role is easing stress-related tension.
Goal fit
L-theanine's most relevant role is easing stress-related tension.
Dose adequacy
One serving provides Inositol 100 mg; Theanine 200 mg. These are serving amounts, not an assumed daily regimen.
Pathways43
L-theanine's most relevant role is easing stress-related tension.
Depth
L-theanine's most relevant role is easing stress-related tension.
Breadth
The clearest connection is calming tension; other listed ingredients don't establish a broader mood effect.
Evidence61
L-theanine's most relevant role is easing stress-related tension.
Evidence strength
L-theanine's most relevant role is easing stress-related tension.
Studied preparation
L-theanine's most relevant role is easing stress-related tension.
Formulation logic100
No required partner or particular ingredient conflict is identified. Serving amounts don't establish an individual mood response.
Partner coverage
No required ingredient partner is missing for the relevant ingredients.
Conflicts
No particular conflict between the listed ingredients is identified.
Effective doses
One serving provides Inositol 100 mg; Theanine 200 mg. These are serving amounts, not an assumed daily regimen.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
L-Theanine | 200 mg | |
Inositol | 100 mg |
Theanine · 200 mg OverallScore92
Each serving provides 200 mg of L-theanine, with the amount disclosed separately. The whole-product price works out to about $0.09 per 100 mg of L-theanine.
How this ingredient is rated
Active Ingredient Quality & Bioavailability80
The ingredient is identified as L-theanine. The saved facts do not identify a branded source or a separate purity claim.
Isomer Specificity (L-Theanine)
The ingredient is specified as L-theanine.
Branded Forms & Purity Standards
The saved facts do not identify a branded source or a separate purity claim.
Dose, Safety & Label Transparency100
Each serving provides 200 mg of L-theanine. The amount and source are disclosed separately.
Theanine Dosage Efficacy
Each serving provides 200 mg of L-theanine.
Label Transparency & Blends
The 200 mg of L-theanine and its source are disclosed separately.
Value100
The whole-product price is about $0.09 per 100 mg of L-theanine.
Price per 100mg L-Theanine
The whole-product price is about $0.09 per 100 mg of L-theanine.
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Sources
Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.
- Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
- A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave® L-Theanine on Stress in a Healthy Adult Population.
- Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
- Assessing the effects of caffeine and theanine on the maintenance of vigilance during a sustained attention task.
- Effects of l-Theanine on Cognitive Function in Middle-Aged and Older Subjects: A Randomized Placebo-Controlled Study.
- Dose-response effect of L-theanine on psychomotor speed, sustained attention, and inhibitory control: a double-blind, placebo-controlled, crossover study.
- Acute effects of theanine, caffeine and theanine-caffeine combination on attention.
- Safety and Efficacy of AlphaWave® L-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo-Controlled Trial.
- Effect of L-theanine on selective attention in a traffic-related reaction task in sleep-deprived young adults: a double-blind placebo-controlled, crossover study.
- l-theanine adjunct to sertraline for major depressive disorder: A randomized, double-blind, placebo-controlled clinical trial.
- L-theanine relieves positive, activation, and anxiety symptoms in patients with schizophrenia and schizoaffective disorder: an 8-week, randomized, double-blind, placebo-controlled, 2-center study.
- The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review.
- Comparison of the effects of two amino acids, Gamma-aminobutyric acid (GABA) and L-theanine, on sedation, anxiety, and cognition in preoperative surgical patients - A randomized controlled study.
- Anti-stress effect of theanine on students during pharmacy practice: positive correlation among salivary α-amylase activity, trait anxiety and subjective stress.
- Cognitive and affective effects of L-Theanine: a systematic review and meta-analysis of 31 randomized trials.
- Effects of L-theanine on cognition, mood and sleep: evidence from human trials.
- Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together.
- Comparison Between Efficacy of Oral Melatonin and Oral L-theanine in Improving Sleep in Cancer Patients Suffering From Insomnia: A Randomised Double-blinded Placebo-controlled Study.
- The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis.
- In Search of a Safe Natural Sleep Aid.