Suntheanine L-Theanine 125 mg
Goals
$18.87 $0.62 per serving
Product analysis
Suntheanine L-Theanine 125 mg may help with relaxation and some aspects of sleep quality at a favorable cost. Everyday improvements in concentration and lasting stress relief are less certain.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
The ingredient preparation is insufficiently specified for a confident quality comparison. A named product does not by itself establish a particular preparation advantage.
Ingredient Transparency63
The serving amount is disclosed, helping compare how much theanine it supplies. The ingredient form is unspecified, leaving preparation details less clear.
Value For Money100
The theanine amount offers favorable value at the serving price. That price advantage does not establish that a larger amount gives a greater benefit.
Customer Satisfaction83
Customer ratings are very positive across more than a thousand reviews. The broad feedback describes satisfaction without proving relaxation or sleep effects.
Product Focus76
Relaxation and some aspects of sleep quality provide the clearest fit. Findings for concentration and sustained mood benefits are mixed, so calmness should not be equated with better performance.
- Format
Capsule - Container
- 60 Capsule(s)
- Per serving
- $0.62
- Customer rating
- 4.7 · 1,515 ratings
Goals
Impact
High effect
Theanine · 250 mg
Impact
High effect
Theanine · 250 mg
Impact
Highest effect
Theanine · 250 mg
Impact
Highest effect
Theanine · 250 mg
Impact
High effect
Theanine · 250 mg
Impact
High effect
Impact
Moderate effect
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Suntheanine L-Theanine | 250 mg |
Theanine · 250 mg OverallScore100
Each serving provides 250 mg of L-Theanine at a low cost for the amount supplied. The source is branded. The amount and form are clearly stated.
How this ingredient is rated
Active Ingredient Quality & Bioavailability100
The form is L-Theanine, the active isomer. The source is branded.
Isomer Specificity (L-Theanine)
The label specifies L-Theanine, the active isomer.
Branded Forms & Purity Standards
The source is branded.
Dose, Safety & Label Transparency100
The serving supplies 250 mg, a substantial amount, and its amount and source are stated.
Theanine Dosage Efficacy
The serving provides 250 mg of theanine, a substantial amount.
Label Transparency & Blends
The theanine amount and source are individually disclosed.
Value100
The cost is low for the amount of theanine, based on the full serving price.
Price per 100mg L-Theanine
The cost is low for the amount of theanine, based on the full serving price.
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.