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Caffeine L-Theanine 100/200 mg

product on market Capsule Hard Rhino 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 and L-theanine are supported by moderate to strong evidence for enhancing alertness and cognitive performance. Research indicates that L-theanine may mitigate the jittery effects of caffeine while promoting a state of relaxed focus. This combination is generally well-tolerated and recognized for improving attention and reaction time.

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

Label

Product Label

Label for Caffeine L-Theanine 100/200 mg
Open Full PDF View on NIH DSLD →
Details

Label Data

1 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)
100 mg
Market median: 180.0mg (239 products) 49 studies (A:1, B:19)

Other Ingredients

Rice Flour Vegetarian Cellulose Magnesium Stearate Silicon Dioxide
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: Healthy adults may take one serving (1 capsule) daily as a dietary supplement for energy and endurance. Do not consume more than 2 servings in one day.

Warnings & Precautions

Caution: Be careful! This product contains caffeine and can be dangerous if abused. Do not exceed a total daily intake of 400mg including but not limited to beverages and other supplements. Failure to follow safety guidelines can result in serious injury and/or death.

Warning: Keep out of the reach of children. Do not take this or any other supplement if under the age of 18, pregnant or nursing a baby, or if you have any known or suspected medical conditions and/or taking prescription drug(s) or OTC medication(s).

Do not take this or any other supplement if under the age of 18, pregnant or nursing a baby, or if you have any known or suspected medical conditions and/or taking prescription drug(s) or OTC medication(s).

Always consult with a qualified health physician before taking any new dietary supplement.

Do not use or consume if seal is broken.

Formulation Notes

This product contains caffeine and can be dangerous if abused.

Allergens: This product contains no soy, dairy & byproducts, eggs, fish, shellfish, wheat, gluten, tree nuts, or sesame seeds.

This contain non-GMO ingredients

Additional Information

Increases mental acuity and focus Promotes energy and endurance Decrease in stress and fatigue

Storage: Store in a cool, dry place.

Metadata

Product Details

UPC / SKU8 18132 85180 9
DSLD Entry Date2017-03-24
Product TypeNon-Nutrient/Non-Botanical
FormCapsule
DSLD ID72165
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
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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.