$20.99 $0.34 per serving
Product analysis
Theanine 200 mg may support relaxation and some aspects of sleep, with more limited benefits for selected attention tasks. Its specific form is not disclosed, making comparisons between preparations harder.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
Theanine’s specific form is not disclosed, which limits confidence in the preparation. A favorable finding for an identified form cannot resolve that omission.
Ingredient Transparency63
The ingredient amount is disclosed, making serving sizes easier to compare. Its specific form is omitted, leaving the preparation less clear.
Value For Money80
Theanine offers good value for the amount supplied. A reasonable cost does not settle the uncertainty about its specific form.
Customer Satisfaction90
Customer feedback is generally very positive and comes from a substantial number of ratings. That reflects satisfaction rather than proof of effectiveness or safety.
Product Focus76
The clearest potential role is relaxation and support for some aspects of sleep. The amount matches a small four-week trial, but mixed results do not establish immediate sedation or broad improvements in thinking.
- Format
Capsule - Container
- 60 Veggie Cap(s)
- Per serving
- $0.34
- Also available
Theanine 100 mg$10.00- Customer rating
- 4.7 · 6,241 ratings
Goals
Impact
High effect
Theanine · 200 mg
Theanine may help with relaxation during stressful tasks and ease tension. Short-term relaxation does not establish lasting relief from stress or anxiety. The 200 mg serving reaches the supplied quantity reference, with the saved findings also connecting it to sleep recovery.
How this product is rated for Stress Relief
Ingredient fit92
The relevant contributors are Theanine. Their amounts vary in how closely they match the supplied references.
Goal fit
The relevant ingredients provide a focused connection to stress support, though their benefits remain specific to the roles described.
Dose adequacy
The contributing ingredients reach the supplied amount references; these comparisons do not establish a proven effective regimen.
Pathways71
The serving reaches the supplied coverage threshold in several areas: neural calming, sleep recovery.
Depth
The strongest saved connection is neural calming, through the relevant ingredients described here; this does not establish a measured biological effect.
Breadth
The serving reaches the supplied coverage threshold in several areas: neural calming, sleep recovery.
Evidence77
The contributing preparations are recognized in the saved findings; this does not establish that the complete product was tested.
Evidence strength
Theanine provides the leading evidence contribution among the included amounts, subject to its specific population and outcome limitations.
Studied preparation
The contributing preparations are recognized in the saved findings; this does not establish that the complete product was tested.
Formulation logic100
The contributing ingredients either work independently or have their required partners present. None of the specific ingredient conflicts checked was identified in the supplied facts.
Partner coverage
The contributing ingredients either work independently or have their required partners present.
Conflicts
None of the specific ingredient conflicts checked was identified in the supplied facts.
Effective doses
All contributing ingredients meet the minimum amount threshold used in the saved comparison; this is not a clinical effectiveness guarantee.
Impact
Highest effect
Theanine · 200 mg
Theanine may help sleep through a calming role, with a connection to stress-related sleep difficulties. Its 200 mg per serving matches the amount used daily for four weeks in a small adult trial that improved some sleep measures. The limited sample and mixed outcomes leave uncertainty, and this does not establish an immediate sedative effect from one serving.
How this product is rated for Sleep Support
Ingredient fit92
Theanine is the sole active and has a meaningful sleep connection; its serving amount matches the recognized range.
Goal fit
The single active supports sleep-related calming, while its wider uses make the product less exclusively focused on sleep.
Dose adequacy
The serving supplies the same theanine amount used in the small four-week trial.
Pathways73
The findings emphasize calming, with a secondary connection to stress regulation.
Depth
Calming is the strongest supported route for theanine.
Breadth
Calming and stress regulation are represented; direct sleep-timing and precursor routes are not.
Evidence86
Small trials support some sleep measures, with less certainty than the strongest sleep ingredient recognized here.
Evidence strength
Theanine has limited, mixed human evidence for sleep outcomes.
Studied preparation
The declared L-theanine matches the recognized preparation.
Formulation logic100
Theanine need no required partner for the recognized roles. No listed activating conflicts were found.
Partner coverage
No required partner is missing for the ingredients that contribute.
Conflicts
The supplied ingredients contain none of the listed activating conflicts.
Effective doses
1 recognized ingredient meets the amount threshold used here; that threshold does not establish a clinical effect.
Impact
Highest effect
Theanine · 200 mg
Theanine may contribute to selected verbal-fluency and executive-function tasks. The 200 mg serving matches the amount used in a small four-week trial, but the cognitive difference was limited to people with lower starting performance. This supports modest, qualified expectations for those tasks rather than uniform improvements in memory or attention.
How this product is rated for Cognitive Support
Ingredient fit92
Theanine is the sole credited ingredient and reaches the saved full amount anchor.
Goal fit
Theanine gives the formula a focused cognitive role, alongside its links to other goals.
Dose adequacy
The 200 mg serving matches the amount used in the small four-week trial.
Pathways51
Theanine contributes through the saved stress and arousal category.
Depth
Stress and arousal regulation is the strongest covered category.
Breadth
Only the stress and arousal category meets the saved coverage threshold.
Evidence81
Theanine has limited standalone cognitive findings, concentrated in a lower-baseline subgroup.
Evidence strength
Theanine supplies the evidence contribution, with low-confidence findings on selected cognitive tasks.
Studied preparation
The saved result recognizes the disclosed theanine as a studied preparation.
Formulation logic100
Theanine needs no partner for its saved contribution, and no configured conflict was found.
Partner coverage
Theanine's contribution does not require caffeine or another partner.
Conflicts
None of the configured ingredient conflicts was matched.
Effective doses
Theanine clears the saved minimum amount threshold.
Impact
High effect
Theanine · 200 mg
Theanine may help sustained attention, based on limited evidence from a small study of attention errors. Its declared serving amount reaches the comparison reference, but the higher reference does not prove greater benefit than the lower amount studied. The supplied findings do not establish improved occupational output or guaranteed calming.
How this product is rated for Productivity Boost
Ingredient fit92
The relevant ingredients provide a focused connection to this goal, although the product is linked to other uses. The counted ingredients reach their saved amount references; these are comparison references, not proven productivity doses.
Goal fit
The relevant ingredients provide a focused connection to this goal, although the product is linked to other uses.
Dose adequacy
The counted ingredients reach their saved amount references; these are comparison references, not proven productivity doses.
Pathways60
The strongest assigned route is calm attention, with full coverage in the saved findings. One configured route reaches the coverage threshold, so the findings remain narrow.
Depth
The strongest assigned route is calm attention, with full coverage in the saved findings.
Breadth
One configured route reaches the coverage threshold, so the findings remain narrow.
Evidence74
Theanine supplies the strongest counted evidence, with benefits limited to the populations and outcomes described for that ingredient.
Evidence strength
Theanine supplies the strongest counted evidence, with benefits limited to the populations and outcomes described for that ingredient.
Studied preparation
The saved findings recognize the counted preparations as studied; this does not establish that this product improves work performance.
Formulation logic100
No configured ingredient conflict was identified in the supplied findings. The counted ingredients have no unmet partner requirement.
Partner coverage
The counted ingredients have no unmet partner requirement in the saved findings; this does not establish synergy.
Conflicts
No configured ingredient conflict was identified in the supplied findings.
Effective doses
All counted ingredients meet the saved minimum amount criterion, which is not proof of a clinically effective productivity dose.
Impact
High effect
Theanine · 200 mg
Theanine has a limited, mixed connection to selective attention. Some supplied findings show faster recognition responses, while others show no reaction-time improvement or worse performance on a particular mental task. Its declared 200 mg per serving meets the saved amount criterion. This supports a narrow expectation for attention rather than broad mental enhancement.
How this product is rated for Mental Focus
Ingredient fit92
Theanine is the sole counted focus ingredient.
Goal fit
Theanine is the sole counted focus ingredient.
Dose adequacy
The declared theanine amount meets the saved full amount criterion.
Pathways60
Theanine supplies the saved calm-attention coverage. Coverage is concentrated in calm attention, with a smaller stress-and-fatigue contribution.
Depth
Theanine supplies the saved calm-attention coverage.
Breadth
Coverage is concentrated in calm attention, with a smaller stress-and-fatigue contribution.
Evidence79
Theanine has mixed, task-specific attention findings. Declared L-theanine meets the saved preparation check.
Evidence strength
Theanine has mixed, task-specific attention findings.
Studied preparation
Declared L-theanine meets the saved preparation check.
Formulation logic84
Caffeine is absent, leaving theanine without the partner required for full recognition in this finding. No configured ingredient conflict was found in the supplied facts.
Partner coverage
Caffeine is absent, leaving theanine without the partner required for full recognition in this finding.
Conflicts
No configured ingredient conflict was found in the supplied facts.
Effective doses
All ingredients counted by this rule meet its minimum amount criterion; this does not establish a proven effective dose.
Impact
Moderate effect
L-theanine may help you feel less tense after mental stress. That makes it more relevant to occasional stress-related feelings than to persistent low mood. Whether it produces a lasting improvement in mood is unclear, and its calming role shouldn't be read as an antidepressant effect.
How this product is rated for Mood Support
Ingredient fit92
L-theanine may ease stress-related tension; lasting mood improvement is less clear.
Goal fit
L-theanine may ease stress-related tension; lasting mood improvement is less clear.
Dose adequacy
Declared serving amounts include Theanine 200 mg. These are serving amounts, not an assumed daily intake.
Pathways43
Neural calming is relevant to stress-related tension. Biological roles do not guarantee a broader emotional benefit.
Depth
The most represented biological role is neural calming; this describes a mechanism, not a guaranteed change in mood.
Breadth
The main represented roles are neural calming. These do not imply separate or additive emotional benefits.
Evidence61
L-theanine may ease stress-related tension; lasting mood improvement is less clear.
Evidence strength
L-theanine may ease stress-related tension; lasting mood improvement is less clear.
Studied preparation
The identified forms permit a comparison with the relevant ingredient preparations, without guaranteeing the same benefit for every person.
Formulation logic100
No particular ingredient conflict is identified.
Partner coverage
No missing required partner is identified for the relevant ingredients.
Conflicts
No particular ingredient conflict is identified.
Effective doses
Theanine 200 mg per serving are declared; comparison amounts don't establish a minimum effective dose.
Impact
High effect
Theanine may support calm attention, with limited evidence from small studies of isolated L-theanine. The 200 mg serving matches the main acute comparison amount. Its contribution focuses on attention and arousal; the supplied evidence does not establish universal or sustained improvements in cognition.
How this product is rated for Brain Health
Ingredient fit92
The relevant declared amount is fully allowed in the saved comparison. The formula's focus also depends on its other ingredients and linked goals.
Goal fit
The relevant ingredient content is focused, although the product is linked to several goals.
Dose adequacy
The declared relevant amount receives the full saved amount allowance; this does not establish the size of a benefit.
Pathways48
The saved findings concentrate on stress and arousal regulation. This does not demonstrate broad cognitive effects.
Depth
The strongest saved finding concerns stress and arousal regulation, with partial coverage.
Breadth
Only stress and arousal regulation reaches the saved breadth threshold, so coverage remains concentrated.
Evidence78
Theanine is the strongest contributor to the saved evidence finding. Its scientific limitations still apply despite meeting the saved preparation criteria.
Evidence strength
Theanine leads the saved evidence finding. Its attention findings are limited.
Studied preparation
Qualifying ingredients meet the saved preparation criteria; this does not remove the population and preparation limitations in the supplied science.
Formulation logic100
The saved findings show no unmet partner or matched conflict. Amount thresholds describe the comparison and do not establish combination benefits.
Partner coverage
The relevant ingredients have no unmet required partner in the saved findings; this does not demonstrate added benefit from combining them.
Conflicts
No configured conflict was matched. The caffeine amount penalties were inapplicable; this is not a general safety finding.
Effective doses
All ingredients included in this rule meet its saved amount threshold; that threshold is not a proven effective dose.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
L-Theanine | 200 mg |
Theanine · 200 mg OverallScore88
Each serving provides 200 mg of L-theanine in a clearly disclosed amount. At the whole-product price, that works out to about $0.17 per 100 mg of L-theanine.
How this ingredient is rated
Active Ingredient Quality & Bioavailability80
The form is identified as L-theanine; the saved details do not identify a branded source or a purity claim.
Isomer Specificity (L-Theanine)
The ingredient is identified as L-theanine.
Branded Forms & Purity Standards
The saved details do not identify a branded source or a purity claim.
Dose, Safety & Label Transparency100
The amount is individually disclosed as 200 mg of L-theanine per serving.
Theanine Dosage Efficacy
Each serving provides 200 mg of L-theanine.
Label Transparency & Blends
The saved information individually discloses 200 mg of L-theanine per serving.
Value80
At the whole-product price, that works out to about $0.17 per 100 mg of L-theanine.
Price per 100mg L-Theanine
At the whole-product price, that works out to about $0.17 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.