Product analysis
Theanine 100 mg may help you feel calmer during stressful tasks and support selected aspects of attention. 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 Satisfaction89
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 Focus66
The clearest potential role is relaxation, with more limited support for selected attention and sleep outcomes. The serving is below the amount used in some small trials, so the same results cannot be assumed.
- Format
Capsule - Container
- 60 Veggie Cap(s)
- Per serving
- $0.16
- Also available
Theanine 200 mg$20.99- Customer rating
- 4.7 · 5,111 ratings
Goals
Impact
High effect
Theanine · 100 mg
Theanine may help with short-term relaxation and tension during stressful tasks; sustained mood and anxiety findings are mixed. Its 100 mg serving provides partial exposure against the supplied amount reference.
How this product is rated for Stress Relief
Ingredient fit72
The declared ingredients are closely focused on this goal, though their roles also relate to other goals. Amounts provide only partial support against the saved references; small or unresolved amounts limit what can be attributed to the formula.
Goal fit
The declared ingredients are closely focused on this goal, though their roles also relate to other goals.
Dose adequacy
Amounts provide only partial support against the saved references; small or unresolved amounts limit what can be attributed to the formula.
Pathways15
The main recorded connection is neural calming. No pathway reaches the saved substantial-coverage threshold, even though partial ingredient contributions remain.
Depth
The strongest recorded connection concerns neural calming, with partial coverage from the included ingredients.
Breadth
No pathway reaches the saved substantial-coverage threshold, even though partial ingredient contributions remain.
Evidence77
Theanine provides the strongest recorded evidence. The qualifying preparations match the supplied evidence.
Evidence strength
Theanine provides the strongest recorded ingredient evidence at a qualifying amount; its population and outcome limitations still apply.
Studied preparation
The qualifying preparations match those recognized in the supplied evidence; this does not show that the finished product was tested.
Formulation logic100
The ingredients work independently or have the required partner in the supplied findings. No listed formulation conflict was matched in the supplied findings. This is limited to the specified checks.
Partner coverage
The ingredients work independently or have the required partner in the supplied findings.
Conflicts
No listed formulation conflict was matched in the supplied findings. This is limited to the specified checks.
Effective doses
All ingredients included in this finding meet its minimum amount threshold; the threshold is not proof of clinical effectiveness.
Impact
High effect
Theanine · 100 mg
Theanine may help with relaxation and some aspects of reported sleep quality. This serving provides 100 mg, below the 200 mg used in the small four-week adult study described in the supplied context. That difference limits how directly the trial applies, and the evidence does not establish an immediate sedative effect.
How this product is rated for Sleep Support
Ingredient fit72
Theanine supplies the clearest sleep-related fit. The serving is below the amount used in the supplied sleep trial.
Goal fit
The relevant ingredients support sleep-related functions, although the product also addresses broader nutritional or wellness needs.
Dose adequacy
The 100 mg serving is below the 200 mg used in the supplied theanine sleep study.
Pathways17
Relaxation-related functions provide the clearest connection to sleep. Relaxation and stress-related contributions remain limited at this amount, with neither reaching the saved coverage benchmark.
Depth
Relaxation-related functions provide the clearest connection to sleep.
Breadth
Relaxation and stress-related contributions remain limited at this amount, with neither reaching the saved coverage benchmark.
Evidence86
Theanine provides the strongest supplied sleep evidence here, based on a small repeated-use adult study.
Evidence strength
Theanine provides the strongest supplied sleep evidence here, based on a small repeated-use adult study.
Studied preparation
The saved preparation check was met; trial-specific findings still limit how broadly sleep effects can be inferred.
Formulation logic100
The credited ingredients can be considered without a required missing partner. No specified sleep-related ingredient conflict was identified in the supplied findings.
Partner coverage
The credited ingredients do not require an additional partner in the saved findings; this does not establish added benefit from combining them.
Conflicts
No specified sleep-related ingredient conflict was identified in the supplied findings.
Effective doses
The counted ingredients meet the saved minimum amount criterion, which does not prove that each independently improves sleep.
Impact
High effect
Theanine · 100 mg
Theanine has limited evidence for verbal fluency and executive tasks, with the favorable findings concentrated in people starting with lower performance. This does not establish a uniform improvement in memory or attention. The 100 mg per serving is below the 200 mg daily amount in the small four-week trial, so the same cognitive effect cannot be assumed.
How this product is rated for Cognitive Support
Ingredient fit72
The included ingredients are focused on the cognitive goal, although the product is also linked to other uses. The counted amounts provide only partial exposure relative to the comparison amounts; smaller or unresolved doses limit the contribution.
Goal fit
The included ingredients are focused on the cognitive goal, although the product is also linked to other uses.
Dose adequacy
The counted amounts provide only partial exposure relative to the comparison amounts; smaller or unresolved doses limit the contribution.
Pathways15
The strongest assigned connection concerns stress and arousal regulation, without proving improved cognitive performance. None of the reviewed mechanisms reached the required coverage level.
Depth
The strongest assigned connection concerns stress and arousal regulation, without proving improved cognitive performance.
Breadth
None of the reviewed mechanisms reached the required coverage level.
Evidence81
Theanine leads the saved evidence comparison, but its specific population and outcome limitations still apply.
Evidence strength
Theanine leads the saved evidence comparison, but its specific population and outcome limitations still apply.
Studied preparation
The counted preparations were treated as matching the comparison; this does not remove the ingredient-specific evidence limitations.
Formulation logic100
The counted ingredients meet the partner and minimum-amount comparisons, and no configured conflict was identified. These findings do not establish combination benefits.
Partner coverage
No counted ingredient was missing a required partner; this does not establish an added benefit from combining ingredients.
Conflicts
No configured ingredient conflict was identified from the supplied facts.
Effective doses
All counted ingredients exceed the minimum comparison amount, which is not a proven effective-dose threshold.
Impact
Moderate effect
Theanine may ease tension associated with mental stress. Its possible benefit is most relevant to feeling calmer during that stress, rather than treating depression or reliably lifting mood over time. The declared ingredient is L-theanine itself, so its amount doesn't depend on guessing how much a tea extract contains.
How this product is rated for Mood Support
Ingredient fit72
Theanine is the relevant ingredient for mood, with no additional unrelated actives identified. Amounts differ in how closely they match the ingredient comparisons.
Goal fit
The relevant ingredients connect directly or conditionally to mood, without additional unrelated actives.
Dose adequacy
Theanine: 100 mg per serving. These are ingredient comparisons, not guarantees of a mood benefit.
Pathways12
The ingredients relate mainly to calming nerve activity; that does not by itself predict a mood improvement.
Depth
The ingredients relate mainly to calming nerve activity; that does not by itself predict a mood improvement.
Breadth
The relevant ingredient has a narrow mood-related role rather than several distinct supported benefits.
Evidence61
Theanine may ease stress-associated tension, with less clarity about lasting mood improvement.
Evidence strength
Theanine may ease stress-associated tension, with less clarity about lasting mood improvement.
Studied preparation
The declared ingredient identities are usable for comparison, but matching an ingredient does not guarantee the same mood effect.
Formulation logic100
The relevant ingredients have no missing required partner or identified internal conflict. This does not imply an added benefit from combining them.
Partner coverage
No required partner ingredient is missing for the relevant ingredients.
Conflicts
No particular conflict among these ingredients is identified.
Effective doses
The declared amount is within the included comparison range; this is not a minimum effective dose or a prediction of benefit.
Impact
High effect
Theanine · 100 mg
Theanine may help selected aspects of attention, but standalone results are mixed rather than consistently positive across tasks. This serving supplies 100 mg, below the 200 mg exposure associated with one selected reaction-time finding. Caffeine is absent, which limits the saved partner finding; it does not prove that adding caffeine would create synergy or prevent jitteriness.
How this product is rated for Mental Focus
Ingredient fit72
Theanine gives this formula a direct attention-related purpose, with no unrelated actives counted. Amounts provide only partial coverage of the saved comparison.
Goal fit
Theanine gives this formula a direct attention-related purpose, with no unrelated actives counted.
Dose adequacy
The declared amounts only partly meet the saved comparison; this measures exposure against reference amounts, not the probability of benefit.
Pathways40
The strongest saved coverage concerns calm attention; this is not proof of improved attention.
Depth
The strongest saved coverage concerns calm attention; this is not proof of improved attention.
Breadth
Only one pathway reaches the saved coverage threshold, so the findings are concentrated rather than broad.
Evidence79
The supplied scientific qualifications limit what the saved favourable findings establish about immediate attention.
Evidence strength
The supplied scientific qualifications limit what the saved favourable findings establish about immediate attention.
Studied preparation
The saved finding treats the qualifying material as studied; this does not remove the ingredient-specific limits on acute attention benefits.
Formulation logic84
No configured ingredient conflict is identified in the supplied findings. Theanine lacks the expected caffeine partner.
Partner coverage
Caffeine is absent, leaving theanine without the partner expected by the saved comparison; standalone attention findings remain mixed.
Conflicts
No configured ingredient conflict is identified in the supplied findings.
Effective doses
All ingredients counted by this rule meet its minimum amount threshold; that threshold is not a clinically proven dose for immediate focus.
Impact
High effect
Theanine may support calm attention, based on limited small studies of isolated L-theanine. This 100 mg serving receives a partial amount allowance relative to the main 200 mg comparison point; that allowance is not a proven dose-response. Sustained cognitive improvement is not established by the supplied evidence.
How this product is rated for Brain Health
Ingredient fit72
Amounts give a mixed or partial overall finding. 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 amounts receive partial overall allowance; this reflects the saved comparison rather than a proven benefit threshold.
Pathways14
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
No pathway reaches the saved breadth threshold, despite a partial contribution.
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.
Impact
High effect
Theanine · 100 mg
Theanine may help sustained attention, based on limited evidence from a small study that used the same 100 mg amount per serving. This is a narrow attention finding, rather than proof of better work output. A higher comparison reference does not mean that taking more produces a larger benefit.
How this product is rated for Productivity Boost
Ingredient fit72
The relevant ingredients provide a focused connection to this goal, although the product is linked to other uses. The declared amounts provide partial support against the saved references, with some contributions limited by their amounts.
Goal fit
The relevant ingredients provide a focused connection to this goal, although the product is linked to other uses.
Dose adequacy
The declared amounts provide partial support against the saved references, with some contributions limited by their amounts.
Pathways40
The strongest assigned route is calm attention, with partial 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 partial 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.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
L-Theanine | 100 mg |
Theanine · 100 mg OverallScore88
Each serving provides 100 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 100 mg of L-theanine per serving.
Theanine Dosage Efficacy
Each serving provides 100 mg of L-theanine.
Label Transparency & Blends
The saved information individually discloses 100 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.
Alternative products
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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.