Confidence: 100%
B0F74VWPSR
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Decision summary
A middling option. It may be usable, but weaker formulation coherence makes better alternatives worth comparing.
Best for
Buyers comparing price and availability and okay with a middle-of-the-pack option.
Consider another option if
You want one of the best-absorbed options in this category.
Score breakdown
Tap a module to see what it measures. A 0 can reflect missing disclosure, not just a negative result.
Dosage quality
2.8/10Dosing looks weaker than ideal
Checks whether labeled ingredient amounts fall within clinically studied ranges (not just regulatory minimums). Low/0 can reflect under-dosing or missing amounts (e.g., proprietary blends).
Explore next
Theanine: high-bioavailability form declared (L Theanine). The main limitation is that theanine: below clinically studied range.
Strengths
Weaknesses
Final verdict
A middling option. It may be usable, but weaker formulation coherence makes better alternatives worth comparing.
A closer look at the main ingredients, how they influence the score, and the supporting evidence when available. Tap any ingredient to expand.
⚠ Moderate evidence exists, but dose is below effective threshold
Dose is below the minimum effective threshold. This is a limiting factor: Dose is likely below clinically useful levels. The declared form supports strong absorption.
Scientific evidence
Owen et al. RCT theanine and caffeine on cognitive performance
Nutritional Neuroscience • 2008
PMID: 18681988.0
Lu et al. RCT L-theanine and stress response in healthy adults
Nutritional Neuroscience • 2004
PMID: 16930802.0
⚠ Strong evidence exists, but dose is below effective threshold
Dose is below the minimum effective threshold. This is a limiting factor: Dose is likely below clinically useful levels. The declared form supports strong absorption.
Scientific evidence
McLellan et al. systematic review caffeine and alertness
Nutritional Neuroscience • 2016
PMID: 26677204.0
Warren et al. meta-analysis caffeine and strength performance
Journal of Strength and Conditioning Research • 2010
PMID: 22840561.0
✔ Clinically effective dose with moderate supporting evidence
Dose is within the optimal/effective range. Solid but not a standout: Dose is directionally useful, but not a standout strength. The declared form is acceptable, but not among the best-absorbed options.
Scientific evidence
Bryan et al. RCT on B vitamins and cognitive function in older adults
American Journal of Clinical Nutrition • 2002
PMID: 16920179.0
ℹ At the minimum effective range, but below the optimal dose with moderate supporting evidence
Dose meets the minimum effective range, but is below the optimal dose used for stronger effects. One of the weaker points: Dose is likely below clinically useful levels. The declared form is acceptable, but not among the best-absorbed options.
Scientific evidence
Clarke et al. meta-analysis B vitamins and cognitive decline
American Journal of Clinical Nutrition • 2007
PMID: 22243457.0
Shipton & Thachil review of vitamin B12 deficiency and fatigue
Postgraduate Medical Journal • 2015
PMID: 20648714.0
Evidence inferred from established knowledge, not directly linked studies
Adequate, but not a key strength: Clinical dosing guidance is limited for this ingredient.
No supporting studies or dosing references are currently available for this ingredient.
Important label or formulation details that may affect how this product should be interpreted.
Theanine dose looks below clinically effective levels
Declared amount falls below ranges used in human trials.
Caffeine dose looks below clinically effective levels
Declared amount falls below ranges used in human trials.
Formula design looks less coherent than stronger alternatives
The formulation appears less focused than better-built options.
Read our methodology overview to understand how SuppScoreLab combines multiple scientific dimensions into one practical score.
View methodology →This evaluation is based on the product label and declared Supplement Facts available at review time. It does not verify laboratory-tested composition, purity, or batch-level quality. This content is educational and not medical advice. Consult a qualified healthcare professional for personal health decisions. Affiliate disclosure: SuppScoreLab may earn a commission from qualifying Amazon links.
See the best Theanine supplements ranked with the same methodology, or keep exploring the database.
