Suntheanine L-Theanine 100 mg
Goals
$35.67 $0.59 per serving
Product analysis
Suntheanine L-Theanine 100 mg may help you feel calmer and support sleep quality when stress makes it harder to settle. Benefits for attention are less consistent, so it is better suited to relaxation than a dependable boost in focus.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
Missing form details make ingredient quality hard to compare confidently. The omissions do not by themselves show that the ingredients perform poorly.
Ingredient Transparency63
Ingredient amounts are disclosed, making it easier to compare serving sizes. Forms are omitted, leaving less clarity about exactly what is included.
Value For Money72
The theanine portion offers favourable value for the amount provided. Carbohydrate value cannot be established, so the price comparison is clearest for theanine.
Customer Satisfaction87
Customers give consistently positive ratings, with a sizeable number of responses behind them. Ratings describe satisfaction and do not establish effectiveness or safety.
Product Focus76
Relaxation and stress-related sleep support are the clearest uses. The wider attention and mood possibilities are less certain and should not be treated as dependable improvements.
- Format
Tablet - Container
- 120 Tablet(s)
- Per serving
- $0.59
- Also available
Suntheanine L-Theanine 100 mg$18.87- Customer rating
- 4.7 · 3,954 ratings
Goals
Impact
Highest effect
Theanine · 200 mg
L-theanine may support relaxation and some aspects of sleep quality, with findings centered on calming and stress-related sleep disruption. The selected two-tablet serving supplies 200 mg, an amount recognized by the saved findings. Small studies used repeated daily intake over several weeks, so this does not establish an immediate sedative effect from a serving. The selected serving is separate from the label's repeated-use directions.
How this product is rated for Sleep Support
Ingredient fit92
Theanine is the sole credited sleep ingredient and its amount is fully recognized in the selected two-tablet serving.
Goal fit
Theanine is sleep-relevant, although the product is linked to several other goals.
Dose adequacy
The selected two-tablet serving supplies a fully recognized theanine amount; daily frequency was not multiplied into it.
Pathways73
Theanine supports the saved calming and stress-related routes, with calming the stronger finding.
Depth
Neural calming is the strongest route.
Breadth
Calming and stress-related regulation both reach the saved coverage threshold.
Evidence86
Theanine is recognized in a studied preparation, though sleep findings come from small repeated-use studies.
Evidence strength
Theanine supplies the leading evidence finding, supported by limited sleep-quality research.
Studied preparation
The L-theanine preparation is recognized as studied.
Formulation logic100
Theanine requires no partner, meets the saved amount threshold, and has no configured conflict here.
Partner coverage
Theanine can contribute without a companion ingredient.
Conflicts
No configured activating-ingredient conflict was found.
Effective doses
Theanine passes the saved amount threshold.
Impact
Moderate effect
L-theanine may help ease tension after mentally demanding tasks. That makes it more relevant to feeling calmer under stress than to a lasting lift in mood. Its benefit for ongoing low mood is less clear, so feeling more relaxed shouldn't be taken as a reliable antidepressant effect.
How this product is rated for Mood Support
Ingredient fit92
L-theanine provides a possible connection to stress-associated tension. Its declared amount and the other ingredients determine how closely that applies here.
Goal fit
Theanine is the sole ingredient linked here to mood; its practical benefit keeps the limitations described above.
Dose adequacy
Theanine 200 mg per serving. These amounts do not guarantee a mood benefit.
Pathways43
The ingredients relate mainly to calming, which differs from a lasting improvement in low mood.
Depth
The ingredients relate mainly to calming, which differs from a lasting improvement in low mood.
Breadth
The connection is concentrated on calming rather than several distinct mood benefits.
Evidence61
L-theanine may ease tension after mental tasks; a lasting lift in low mood is less clear.
Evidence strength
L-theanine may ease tension after mental tasks; a lasting lift in low mood is less clear.
Studied preparation
The declared ingredients retain their own limits; their identity alone does not guarantee a mood benefit.
Formulation logic100
The relevant ingredients do not require an additional partner, and no particular ingredient conflict is identified.
Partner coverage
No additional partner is required for the relevant ingredients to have their individual roles.
Conflicts
No particular ingredient conflict is identified for this combination.
Effective doses
The declared amounts allow ingredient-specific comparison, but do not establish how much mood improvement you will experience.
Impact
High effect
Theanine · 200 mg
Theanine may ease tension and responses to stressful tasks. The 200 mg serving matches the supplied comparison anchor and contributes to the calming and sleep-recovery findings. Results for sustained mood and anxiety are mixed, so an acute feeling of relaxation does not establish durable everyday stress relief.
How this product is rated for Stress Relief
Ingredient fit92
The declared relevant ingredients are focused on stress-related uses, with no unrelated actives reducing that focus. The counted amounts reach the comparison anchors; larger amounts do not establish stronger or more lasting relief.
Goal fit
The declared relevant ingredients are focused on stress-related uses, with no unrelated actives reducing that focus.
Dose adequacy
The counted amounts reach the comparison anchors; larger amounts do not establish stronger or more lasting relief.
Pathways71
The clearest contribution concerns neural calming. Other processes are represented to differing degrees by this serving.
Depth
The strongest supplied finding concerns neural calming, without proving a lasting clinical effect.
Breadth
The broader findings chiefly cover neural calming, sleep recovery.
Evidence77
Theanine leads the counted evidence. Recognized preparations are present, with benefit limited by the study contexts described above.
Evidence strength
Theanine supplies the strongest counted evidence; its specific study limitations still govern expectations for relief.
Studied preparation
The counted preparations match those recognized by the supplied comparison, without establishing that all studies or populations match this product.
Formulation logic100
The counted ingredients have their relevant partners or stand alone, and no configured conflict was found. Their amounts reach the minimum comparison benchmark.
Partner coverage
The counted ingredients either work independently in this comparison or have their relevant partner present.
Conflicts
No configured ingredient conflict was found in the supplied findings.
Effective doses
All counted ingredients meet the minimum amount benchmark; this is not a proven effective dose for lasting stress relief.
Impact
High effect
Theanine · 200 mg
Theanine may modestly support selective attention, although findings for taking it alone are mixed. Some tasks have improved while others have not, so expectations should stay narrow. The declared amount supports the saved finding, but a higher amount does not establish a stronger effect.
How this product is rated for Mental Focus
Ingredient fit92
Theanine provides a focused but modest connection to selective attention. The declared amount reaches the saved amount range; this is not proof of a stronger effect at higher intake.
Goal fit
Theanine provides a focused but modest connection to selective attention.
Dose adequacy
The declared amount reaches the saved amount range; this is not proof of a stronger effect at higher intake.
Pathways60
Calm attention is the main route represented by theanine.
Depth
Calm attention is the main route represented by theanine.
Breadth
The finding centers on calm attention, with a smaller stress-related contribution.
Evidence79
Theanine has mixed acute attention findings rather than consistent broad benefits.
Evidence strength
Theanine has mixed acute attention findings rather than consistent broad benefits.
Studied preparation
The saved preparation match is complete for the ingredients that meet its amount criterion; this does not establish consistent focus benefit.
Formulation logic84
Theanine lacks its caffeine partner in the supplied formula, so its standalone attention limitations remain relevant. No specified ingredient conflict was identified in the saved findings.
Partner coverage
Theanine lacks its caffeine partner in the supplied formula, so its standalone attention limitations remain relevant.
Conflicts
No specified ingredient conflict was identified in the saved findings.
Effective doses
All ingredients counted by this rule reach its minimum amount criterion; that threshold is not a clinically proven effective dose.
Impact
Highest effect
Theanine · 200 mg
Theanine has limited relevance to verbal fluency and executive function, with the supplied trial's cognitive difference confined to a lower-baseline subgroup. The selected serving provides 200 mg, matching that trial's daily exposure over four weeks. This does not establish uniform improvements in memory, learning or attention.
How this product is rated for Cognitive Support
Ingredient fit92
Theanine is the product's focused cognitive ingredient.
Goal fit
Theanine is the product's focused cognitive ingredient.
Dose adequacy
The selected serving matches the supplied trial exposure.
Pathways51
Stress and arousal regulation is the sole covered pathway.
Depth
Stress and arousal regulation is the sole covered pathway.
Breadth
Only that pathway reaches the saved breadth threshold.
Evidence81
Theanine's cognitive findings come from a small trial with a subgroup-specific result.
Evidence strength
Theanine's cognitive findings come from a small trial with a subgroup-specific result.
Studied preparation
The saved findings recognize the included preparations; this does not remove the ingredient-specific limits on cognitive benefit.
Formulation logic100
The included ingredients require no missing partner, and no configured conflict was found.
Partner coverage
No required partner is missing for the included ingredients; this does not imply added benefit from combining them.
Conflicts
No configured ingredient conflict was found in the supplied facts.
Effective doses
All included ingredients meet the saved minimum amount threshold; that threshold is not proof of cognitive benefit.
Impact
High effect
Theanine may support calm attention in the short term, based on small studies of isolated L-theanine. This 200 mg serving matches the endpoint used for the supplied comparison, but does not establish universal or sustained cognitive improvement. The findings do not demonstrate neuroprotection or prevention of cognitive decline.
How this product is rated for Brain Health
Ingredient fit92
The relevant ingredients give the formula a direct brain-health focus, though its stated uses span other goals.
Goal fit
The relevant ingredients give the formula a direct brain-health focus, though its stated uses span other goals.
Dose adequacy
The declared amounts fully meet the supplied exposure comparison, without establishing universal benefit or a daily regimen.
Pathways48
The strongest represented mechanism is stress and arousal regulation, with the relevant ingredient limitations still applying.
Depth
The strongest represented mechanism is stress and arousal regulation, with the relevant ingredient limitations still applying.
Breadth
The contribution concentrates on one mechanism, limiting breadth across different aspects of brain function.
Evidence78
Theanine leads the evidence finding, within the supplied population and outcome limitations.
Evidence strength
Theanine leads the evidence finding, within the supplied population and outcome limitations.
Studied preparation
The relevant preparations are accepted in the supplied comparison; this does not remove limitations in the underlying cognitive findings.
Formulation logic100
The relevant ingredients work independently or have the required partner. No configured conflict is identified in the supplied ingredient findings.
Partner coverage
The relevant ingredients work independently or have the required partner.
Conflicts
No configured conflict is identified in the supplied ingredient findings.
Effective doses
The included ingredients meet the minimum amount comparison; that threshold does not establish a proven cognitive dose.
Impact
High effect
Theanine · 200 mg
Theanine has limited evidence for reducing errors on a sustained-attention task in a small study. The selected serving supplies 200 mg; this does not establish greater benefit than the tested 100 mg exposure. The findings concern attention rather than measured work output, and do not guarantee calmness or relief from caffeine jitters.
How this product is rated for Productivity Boost
Ingredient fit92
The formula is concentrated on the relevant ingredients. The relevant declared amount reaches the comparison range, without proving additional work benefit.
Goal fit
The formula is concentrated on the relevant ingredients.
Dose adequacy
The relevant declared amount reaches the comparison range, without proving additional work benefit.
Pathways60
The strongest recorded connection is calm attention; this does not establish improved work performance. Coverage reaches the threshold for one pathway and remains limited in breadth.
Depth
The strongest recorded connection is calm attention; this does not establish improved work performance.
Breadth
Coverage reaches the threshold for one pathway and remains limited in breadth.
Evidence74
Theanine leads the evidence comparison; the supplied context does not establish broad productivity enhancement. The preparation is accepted in the supplied finding, while its scientific applicability remains limited by the relevant study context.
Evidence strength
Theanine leads the evidence comparison; the supplied context does not establish broad productivity enhancement.
Studied preparation
The preparation is accepted in the supplied finding, while its scientific applicability remains limited by the relevant study context.
Formulation logic100
No relevant ingredient has an unmet partner requirement. No configured conflict was matched.
Partner coverage
The counted ingredients have no unmet partner requirement.
Conflicts
No configured conflict was matched.
Effective doses
The counted ingredients reach the amount threshold used for comparison; this is not proof of an effective productivity regimen.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Calories | 15 Calorie(s) | |
Total Carbohydrates | 4 Gram(s) | |
Suntheanine L-Theanine | 200 mg |
Theanine · 200 mg OverallScore96
Each serving supplies 200 mg of branded L-theanine. The whole-product price works out to about $0.30 per 100 mg of theanine.
How this ingredient is rated
Active Ingredient Quality & Bioavailability100
The ingredient is identified as L-theanine, and a branded form is recorded in the saved information.
Isomer Specificity (L-Theanine)
The ingredient is identified as L-theanine, specifying the L form.
Branded Forms & Purity Standards
The saved information records a branded form of L-theanine; its purity has not been independently verified here.
Dose, Safety & Label Transparency100
The separately disclosed serving provides 200 mg of L-theanine.
Theanine Dosage Efficacy
The serving supplies a meaningful 200 mg of L-theanine.
Label Transparency & Blends
The amount of L-theanine is disclosed separately as 200 mg per serving.
Value80
The whole-product price is relatively moderate at about $0.30 per 100 mg of theanine.
Price per 100mg L-Theanine
The whole-product price works out to about $0.30 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.