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Energy + Focus

product on market Capsule ZHOU Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 100% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · grounded in 1 source · methodology

Caffeine anhydrous and L-theanine are supported by strong evidence for improving alertness and cognitive performance. Research indicates that combining these ingredients may enhance focus while mitigating the jittery effects of caffeine. The overall evidence coverage for this specific formulation remains limited.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Energy + Focus
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Vegetable Capsule(s)
Serving Size
60
Servings
Non-Nutrient/Non-Botanical
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

200 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)
Market median: 180.0mg (239 products) 49 studies (A:1, B:19)

Other Ingredients

Rice Flour Vegetable Cellulose
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: As a dietary supplement, take one (1) vegetarian capsule when focused energy is desired. Do not take more than four (4) capsules per day.

Warnings & Precautions

Do not take more than four (4) capsules per day. Caution: Do not exceed recommended dose.

Pregnant or nursing mothers, children under 18 and individuals with a known medical condition should consult a physician before using this or any dietary supplement.

Pregnant or nursing mothers, children under 18 and individuals with a known medical condition should consult a physician before using this or any dietary supplement.

Keep out of reach of children.

Do not use if safety seal is damaged or missing.

Warning: This product contains 100mg of caffeine per serving (equivalent to approximately 1 cup of coffee).

Formulation Notes

Caffeine + L-Theanine

Warning: This product contains 100mg of caffeine per serving (equivalent to approximately 1 cup of coffee).

Made with Non-GMO ingredients

No gluten, soy, milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, preservatives, animal products or derivatives.

Additional Information

Greatness by nature

Focused energy for your mind & body

Supports smooth & jitter-free energy

Store in a cool, dry place.

Good Manufacturing Practice GMP Consistent quality

Manufactured in the USA

Made with Non-GMO ingredients

Take charge

Metadata

Product Details

UPC / SKUX000WXW2JN
DSLD Entry Date2017-03-24
Product TypeNon-Nutrient/Non-Botanical
FormCapsule
BrandZHOU
DSLD ID71372
Data Updated2026-04-11
Research

Research Evidence

37
Research Sources
53
Avg Quality
22
Rct
10
Systematic Review
3
Meta Analysis
1
Clinical Trial
1
Openfda Safety
B Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials
Systematic Review Nutritional neuroscience 2026 PubMed DOI
B The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
Meta Analysis Sleep medicine reviews 2025 PubMed DOI
B The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness
Rct Nutritional neuroscience 2010 PubMed DOI
B Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
Rct Nutrients 2019 PubMed DOI
B The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review
Systematic Review International journal of molecular sciences 2023 PubMed DOI
B 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
Meta Analysis Nutrition reviews 2025 PubMed DOI
B Effect of Alpha-S1-Casein Tryptic Hydrolysate and L-Theanine on Poor Sleep Quality: A Double Blind, Randomized Placebo-Controlled Crossover Trial
Rct Nutrients 2022 PubMed DOI
B 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
Rct Nutritional neuroscience 2025 PubMed DOI
B The combined effects of L-theanine and caffeine on cognitive performance and mood
Rct Nutritional neuroscience 2008 PubMed DOI
B Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis
Meta Analysis Nutrition reviews 2014 PubMed DOI
View all evidence for L Theanine →
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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.