L-Theanine 200 mg Double Strength
Goals
$22.59 $0.37 per serving
Product analysis
L-Theanine 200 mg Double Strength may help you feel calmer during stressful tasks and may support sleep quality, at a favorable cost. Evidence for better everyday concentration is mixed.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
The theanine form is not fully specified. That limits confidence in comparing its quality with other theanine supplements.
Ingredient Transparency63
Amounts are disclosed, so you can check what each serving provides. Missing form details limit comparison with alternatives.
Value For Money80
The theanine amount offers good value for its cost. The price comparison is favorable for a supplement centered on this ingredient.
Customer Satisfaction83
Customer feedback is very positive. The large review pool gives a useful view of satisfaction, without establishing health benefits.
Product Focus76
Calming and sleep quality are the clearest potential uses. The serving matches amounts used in small trials, but sustained mood changes and broad improvements in attention remain uncertain.
- Format
Capsule - Container
- 60 Veggie Cap(s)
- Per serving
- $0.37
- Customer rating
- 4.8 · 1,136 ratings
Goals
Impact
High effect
Theanine · 200 mg
Impact
High effect
Theanine · 200 mg
Impact
Highest effect
Theanine · 200 mg
Impact
High effect
Impact
High effect
Theanine · 200 mg
Impact
Moderate effect
Impact
Highest effect
Theanine · 200 mg
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Suntheanine L-Theanine | 200 mg |
Theanine · 200 mg OverallScore96
The serving provides 200 mg of L-Theanine, with a relatively low cost per 100 mg. The amount falls in a range associated with relaxation and focus. A branded form is indicated, though its name is unclear.
How this ingredient is rated
Active Ingredient Quality & Bioavailability100
The form is L-Theanine, the form associated with calming and focus. A branded form is indicated, though its name is unclear.
Isomer Specificity (L-Theanine)
The form is L-Theanine, the form associated with calming and focus.
Branded Forms & Purity Standards
A branded form is indicated, though its name is unclear.
Dose, Safety & Label Transparency100
The amount is clearly stated. 200 mg per serving falls in the range associated with relaxation and focus.
Theanine Dosage Efficacy
200 mg per serving falls in the range associated with relaxation and focus.
Label Transparency & Blends
The label states 200 mg of L-Theanine per serving.
Value80
The cost per 100 mg of theanine is relatively low.
Price per 100mg L-Theanine
The cost per 100 mg of theanine is relatively low.
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.