$12.88 $0.51 per serving
Product analysis
Restful Sleep Blackberry Zen combines melatonin for sleep timing with theanine for relaxation and possible sleep-quality support. Melatonin can slow reactions for hours, making the formula poorly suited to daytime use.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality20
The precise ingredient preparations are unnamed, leaving quality comparisons uncertain. The declared amounts alone do not resolve those differences.
Ingredient Transparency63
Declared amounts make serving comparisons easier. Missing form details limit a closer comparison of ingredient quality.
Value For Money50
The cost relative to the theanine amount is favorable. The melatonin serving comparison is less favorable, while value for the herbs remains uncertain.
Customer Satisfaction83
Customer feedback is mostly positive. Thousands of reviews provide a broad picture of buyer sentiment.
Product Focus69
Sleep timing and relaxation are the clearest purposes. Melatonin-related sedation works against the formula's broader daytime attention uses.
- Format
Gummy - Container
- 50 Gummy(ies)
- Per serving
- $0.51
- Customer rating
- 4.4 · 7,420 ratings
Goals
Impact
Highest effect
Melatonin · 3 mgTheanine · 200 mg
Impact
High effect
Theanine · 200 mg
Impact
Moderate effect
Impact
High effect
Impact
High effect
Theanine · 200 mg
Impact
Lower effect
Theanine · 200 mg
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Calories | 15 Calorie(s) | |
Total Carbohydrates | 3 Gram(s) | |
L-Theanine | 200 mg | |
Melatonin | 3 mg | |
Chamomile extract | 17 mg | |
Passionflower extract | 17 mg | |
Lemon Balm extract | 16 mg |
Theanine · 200 mg OverallScore88
Each serving provides 200 mg of L-Theanine, an amount associated with calming and focus support, at a moderate cost per 100 mg. The available details do not specify a branded form or a purity claim.
How this ingredient is rated
Active Ingredient Quality & Bioavailability80
The label specifies L-Theanine. The available details do not specify a branded form or a purity claim.
Isomer Specificity (L-Theanine)
L-Theanine is the active form associated with calming and focus.
Branded Forms & Purity Standards
No branded form or additional purity claim is specified in the available details.
Dose, Safety & Label Transparency100
The serving provides 200 mg of L-Theanine, an amount associated with calming and focus support. The amount is listed separately.
Theanine Dosage Efficacy
The serving provides 200 mg, an amount associated with calming and focus support.
Label Transparency & Blends
The L-Theanine amount is listed separately.
Value80
The cost per 100 mg of theanine is moderate.
Price per 100mg L-Theanine
The cost per 100 mg of theanine is moderate.
Melatonin · 3 mg OverallScore46
Each serving provides 3 mg of melatonin at a very high cost per serving. The available information does not show a third-party purity verification claim. The melatonin source is unspecified.
How this ingredient is rated
Active Ingredient Quality & Bioavailability0
The available information does not show a third-party purity verification claim. The melatonin source is unspecified.
Third-Party Purity Verification
The available information does not show a third-party purity verification claim.
Dose, Safety & Label Transparency100
Each serving provides 3 mg of melatonin.
Physiological Dosing Alignment
Each serving provides 3 mg of melatonin.
Value30
The cost per serving is very high.
Price Per Serving Efficiency
The cost per serving is very high.
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Sources
Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.
- Comparative Efficacy, Tolerability, and Acceptability of Donanemab, Lecanemab, Aducanumab, Melatonin, and Aerobic Exercise for a Short Time on Cognitive Function in Mild Cognitive Impairment and Mild Alzheimer's Disease: A Systematic Review and Network Meta-Analysis.
- Melatonin for sleep and cognitive outcomes in older adults with cognitive impairment: a meta-analysis of randomised controlled trials.
- Add-on prolonged-release melatonin for cognitive function and sleep in mild to moderate Alzheimer's disease: a 6-month, randomized, placebo-controlled, multicenter trial.
- Early Oral Melatonin Supplementation Supports White Matter Maturation in Preterm Infants: Neuroprotective Insights of an Antioxidant Molecule.
- Efficacy and Safety of Melatonin in Migraine Prophylaxis: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
- 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.
- 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.
- Safety and Efficacy of AlphaWave® L-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo-Controlled Trial.
- Effects of L-theanine on cognition, mood and sleep: evidence from human trials.