$24.64 $0.41 per serving
Product analysis
L-Theanine 150 mg may help you feel calmer during stressful moments and may support some aspects of sleep quality. Its effects on attention and sustained mental performance are less consistent.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
The ingredient listing does not specify the theanine form clearly enough for a confident quality comparison. The product name alone does not resolve its preparation details.
Ingredient Transparency63
The theanine amount is stated. Its form is unspecified in the ingredient listing, limiting preparation comparisons.
Value For Money80
The declared theanine content offers favorable value for the full serving cost. Good value does not establish that the serving matches amounts associated with benefits.
Customer Satisfaction79
Customer ratings are favorable across several hundred reviews. They offer useful feedback without proving effectiveness or safety.
Product Focus73
Relaxation is the clearest theme across the related sleep and attention uses. The serving is below the amount used in several small trials, so lasting stress or thinking benefits remain uncertain.
- Format
Capsule - Container
- 60 Capsule(s)
- Per serving
- $0.41
- Customer rating
- 4.7 · 768 ratings
Goals
Impact
High effect
Theanine · 150 mg
Theanine may help relaxation and tension during stressful tasks. Sustained mood and anxiety findings are mixed, so short-term calm does not establish lasting stress relief. The selected serving supplies 150 mg, below the supplied full-reference amount.
How this product is rated for Stress Relief
Ingredient fit82
Theanine provides the stress-related contribution. Theanine is below the full-reference amount but still contributes.
Goal fit
Theanine provides the stress-related contribution.
Dose adequacy
Theanine is below the full-reference amount but still contributes.
Pathways43
Calming is the main area, with a secondary sleep-related contribution.
Depth
Calming has the strongest contribution.
Breadth
Calming is the only substantially represented area.
Evidence77
Theanine has direct tension and stress-task findings, with less consistent sustained benefits.
Evidence strength
Theanine has direct tension and stress-task findings, with less consistent sustained benefits.
Studied preparation
The included contributing forms receive preparation recognition, without establishing identical effects across formulations.
Formulation logic100
The contributing ingredients meet the saved amount threshold and partner checks. No listed conflict was identified.
Partner coverage
The contributing ingredients can contribute independently or have their required partners present.
Conflicts
No listed ingredient conflict was identified in the supplied checks.
Effective doses
All contributing ingredients reach the saved minimum contribution threshold; that threshold does not establish a clinically effective dose.
Impact
High effect
Theanine · 150 mg
Theanine may help selected aspects of attention, although standalone findings are mixed and do not show consistent improvement across attention tasks. The declared amount contributes to the calm-attention finding. Caffeine is absent, so the formulation is treated as theanine alone; this does not establish an added benefit from combining the two.
How this product is rated for Mental Focus
Ingredient fit82
Theanine underpin this product’s connection to focus. Some amounts provide only a partial match to the saved comparison ranges.
Goal fit
The relevant ingredients dominate the formula, although it is linked to several goals.
Dose adequacy
The included amounts only partly meet the saved reference ranges for the relevant ingredients.
Pathways50
The main mapped contribution is calm attention. Other aspects of focus receive less coverage.
Depth
Calm attention is the strongest mapped route, with partial coverage. This describes the main contribution rather than all aspects of focus.
Breadth
The meaningful mapped contribution is concentrated in one route, with limited breadth across other aspects of focus.
Evidence79
Attention evidence depends on the specific ingredient, preparation and context; it does not imply broad cognitive enhancement.
Evidence strength
Theanine or caffeine provides the leading attention evidence where present; the specific effects and limitations still apply.
Studied preparation
The included preparations match those accepted in the saved comparison; this does not extend the trials to different outcomes or populations.
Formulation logic84
The included ingredients have no identified configured conflict. Theanine lacks its configured caffeine partner.
Partner coverage
Theanine is present without caffeine and is treated as a standalone ingredient; no extra combination effect is established.
Conflicts
No configured ingredient conflict was identified in the supplied findings.
Effective doses
The included ingredients meet the saved minimum amount threshold; that threshold is not a demonstrated effective dose for acute focus.
Impact
High effect
L-theanine may help with calm focus and selected attention tasks. This 150 mg serving is below the 200 mg acute-study comparison amount, so the contribution remains partial. Small studies do not establish sustained cognitive improvement.
How this product is rated for Brain Health
Ingredient fit82
Most known serving amounts contribute substantially to the saved comparison, while some amounts remain partial.
Goal fit
The relevant ingredients are concentrated on this goal, although the product may also be linked to other uses.
Dose adequacy
Most known serving amounts contribute substantially to the saved comparison, while some amounts remain partial.
Pathways41
The strongest saved finding concerns stress and arousal regulation; that connection does not by itself establish a noticeable cognitive benefit.
Depth
The strongest saved finding concerns stress and arousal regulation; that connection does not by itself establish a noticeable cognitive benefit.
Breadth
One listed function reaches the saved coverage threshold, so the functional spread remains narrow.
Evidence78
The saved comparison recognizes the included forms, without establishing that the entire product or its serving schedule was tested.
Evidence strength
Theanine provides the strongest saved evidence contribution among the included ingredients; its specific population and benefit limitations still apply.
Studied preparation
The saved comparison recognizes the included forms, without establishing that the entire product or its serving schedule was tested.
Formulation logic100
The supplied comparison finds no missing required partners or matched conflicts. Amount limitations are reflected separately.
Partner coverage
The included contributions have no missing required partner in the supplied comparison; this does not establish added benefit from combining them.
Conflicts
No configured conflict was matched in the supplied facts.
Effective doses
All counted ingredients clear the saved minimum amount threshold; that threshold is not a proven effective dose for an individual.
Impact
High effect
Theanine · 150 mg
Theanine may support selected verbal-fluency or executive tasks, though the small standalone trial's advantage was limited to adults with lower starting performance. Its 150 mg per serving is below the 200 mg daily amount studied and receives partial exposure recognition. Relaxation does not by itself establish improved cognitive performance.
How this product is rated for Cognitive Support
Ingredient fit82
Theanine is the only recognized active, with partial recognition of its declared amount.
Goal fit
The single relevant ingredient gives a focused formulation, although it is linked to several purposes.
Dose adequacy
Theanine receives partial exposure recognition; the serving amount is below the daily amount used in the small cognitive trial.
Pathways43
Theanine contributes only to stress and arousal regulation, with narrower coverage than the full amount comparison.
Depth
Stress and arousal regulation is the strongest and only represented pathway.
Breadth
One pathway reaches the saved coverage threshold, leaving a narrow pathway range.
Evidence81
Theanine's evidence remains limited by a small trial and subgroup-specific findings. Its preparation meets the saved comparison.
Evidence strength
Theanine supplies the evidence contribution, with limited selected-task findings in adults with lower starting performance.
Studied preparation
Theanine meets the saved preparation comparison.
Formulation logic100
Theanine meets the minimum exposure threshold without a missing partner or listed conflict.
Partner coverage
Theanine can be considered alone and does not require caffeine.
Conflicts
No listed ingredient conflict was found.
Effective doses
Theanine reaches the minimum exposure threshold despite receiving only partial overall amount recognition.
Impact
High effect
Theanine · 150 mg
L-theanine supports relaxation and may improve some aspects of reported sleep quality. Its 150 mg per serving is below the 200 mg daily amount used in a small four-week trial, so those findings do not establish the same benefit from this serving or an immediate sedative effect.
How this product is rated for Sleep Support
Ingredient fit82
Theanine provides a focused relaxation ingredient, with partial amount recognition.
Goal fit
Theanine is the only relevant active, though the product is linked to several goals.
Dose adequacy
The serving receives partial amount recognition; it is below the amount in the cited repeated-use trial.
Pathways45
Neural calming is the main finding, with a smaller stress-related contribution.
Depth
Neural calming is the strongest supported area.
Breadth
Only neural calming reaches the saved coverage criterion.
Evidence86
Theanine has limited human sleep findings and a recognized preparation.
Evidence strength
Theanine supplies the strongest evidence here, based on a small trial with selected sleep improvements.
Studied preparation
The declared L-theanine is recognized as a studied preparation.
Formulation logic100
Theanine needs no partner, and no configured conflict was found.
Partner coverage
Theanine can contribute without a required partner.
Conflicts
No configured ingredient conflict was identified.
Effective doses
Theanine reaches the saved amount criterion.
Impact
Moderate effect
L-theanine may help ease tension during stressful moments. That calming effect is the useful connection to mood, although it doesn’t mean you can expect a lasting improvement in depression symptoms.
How this product is rated for Mood Support
Ingredient fit82
The connection is calming during stress, rather than a predictable lasting change in mood.
Goal fit
The connection is calming during stress, rather than a predictable lasting change in mood.
Dose adequacy
Theanine: 150 mg per serving.
Pathways17
The connection is calming during stress, rather than a predictable lasting change in mood.
Depth
The connection is calming during stress, rather than a predictable lasting change in mood.
Breadth
The main connection is calming during stress.
Evidence61
The connection is calming during stress, rather than a predictable lasting change in mood.
Evidence strength
The connection is calming during stress, rather than a predictable lasting change in mood.
Studied preparation
The declared ingredient identity is usable, without implying brand superiority or a guaranteed mood benefit.
Formulation logic100
The relevant ingredients don’t require an additional partner. No particular ingredient conflict is identified.
Partner coverage
No required additional ingredient is missing for the relevant ingredient roles.
Conflicts
No particular conflict among the listed ingredients is identified.
Effective doses
Theanine: 150 mg per serving.
Impact
High effect
Theanine · 150 mg
Theanine may support sustained attention, based on limited standalone evidence measuring attention errors. The 150 mg serving receives a partial amount contribution, but this interpolation does not establish a clinical dose-response. Better attention-test performance does not establish better work output or guarantee calming.
How this product is rated for Productivity Boost
Ingredient fit82
Theanine provides limited standalone attention-task support. Its relevant ingredients align with the goal, though the product is linked to several goals.
Goal fit
Relevant ingredients account for the goal-related focus, moderated by links to other goals.
Dose adequacy
The 150 mg theanine serving receives partial amount recognition; this is not a proven clinical dose-response.
Pathways50
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.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Suntheanine L-Theanine | 150 mg |
Theanine · 150 mg OverallScore96
Each serving provides 150 mg of L-theanine. The whole-product price works out to $0.27 per 100 mg of theanine.
How this ingredient is rated
Active Ingredient Quality & Bioavailability100
The recorded form is L-theanine from a branded source.
Isomer Specificity (L-Theanine)
The ingredient is identified as L-theanine.
Branded Forms & Purity Standards
A branded source is recorded, although its name is not given in the saved facts.
Dose, Safety & Label Transparency100
150 mg of L-theanine is individually disclosed per serving.
Theanine Dosage Efficacy
The serving contains 150 mg of L-theanine.
Label Transparency & Blends
The 150 mg of L-theanine is individually disclosed per serving.
Value80
The whole-product price works out to $0.27 per 100 mg of theanine.
Price per 100mg L-Theanine
The whole-product price works out to $0.27 per 100 mg of theanine.
Alternative products
Report alternatives
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.