Smart Caffeine With L-Theanine

product on market Capsule NS Natural Stacks 🟢 Safety: 100/100
Brand: NS Natural Stacks
🟢 100/100

This product looks safe

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

Product Label

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Label Data

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

Supplement Facts — Evidence Check

100 mg
📊 Market median: 180.0mg (239 products) 📚 43 studies (Tier A: 1, B: 19)
This product: 100mg UL 400mg
200 mg
📊 Market median: 200.0mg (358 products) 📚 9 studies (Tier A: 0, B: 2)
This product: 200mg

Other Ingredients

Vegetable Capsule Cellulose Vegetable Stearate Silica

Label Claims — Verification

❓ All Other
❓ Structure/Function
All Other (99% of products) Structure/Function (92% of products) Nutrient (22% of products)

Target Groups

Children 4 or More Years of Age Adult (18 - 50 Years) Gluten Free

Product Information

📋 Directions for Use

Suggested Use: Take a serving of 1-2 capsules whenever focused energy is desired. Avoid use in the evening. Do not take more than 6 capsules per day.

⚠️ Warnings & Precautions

Warning: Do not use if pregnant, nursing, or under the age of 12.

Warning: Do not use if pregnant, nursing, or under the age of 12. Consult with a healthcare practitioner before taking this or any nutritional supplement if you have or suspect a medical condition, are taking any medications, or other non-Natural Stacks dietary supplements.

Do not use if safety seal is broken or missing.

Keep out of reach of children.

🧪 Formulation Notes

No GMO No gluten No artificial colors No preservatives

Additional Information

Store in a cool dry place.

U.S.A. manufactured in cGMP facility.

All natural Pure energy - no crash

Product Details

UPC / SKU 7 98295 45253 5
DSLD Entry Date 2016-11-21
Product Type Non-Nutrient/Non-Botanical
Form Capsule
Brand NS Natural Stacks
DSLD ID 66761
Data Updated 2026-04-11

Research Evidence

37 Research Sources
53 Avg Quality Score
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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