🟢 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

0.2 Gram(s) Serving Size
750 Servings
Non-Nutrient/Non-Botanical Product Type
100% Evidence Coverage

Supplement Facts — Evidence Check

200 mg
📊 Market median: 200.0mg (358 products) 📚 9 studies (Tier A: 0, B: 2)
This product: 200mg

Other Ingredients

Absolutely None

Label Claims — Verification

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

Target Groups

Vegetarian Adult (18 - 50 Years) Kosher Gluten Free

Product Information

📋 Directions for Use

Suggested Use: As a dietary supplement, take 1 serving with your favorite beverage 1 to 2 times daily on an empty stomach, or as directed by your physician. We advise an accurate milligram weight scale be used.

⚠️ Warnings & Precautions

Warning: Not intended for use by persons under the age of 18. Keep out of the reach of children.

If you are pregnant, breast feeding, have known medical conditions (including kidney or liver disease) or are taking prescription or OTC medication(s) consult with your health care practitioner before using this product. If you are taking anti-depressant drugs such as MAOI's or SSRI's, consult your healthcare professional before taking this product.

Discontinue use two weeks prior to surgery.

🧪 Formulation Notes

Vegetarian

Non-GMO Gluten free BSE/TSE free

OU (Kosher)

Pure grade amino acid

No fillers No excipients

HPLC lab tested for potency

Free of harmful impurities

Additional Information

Manufactured in our GMP & FDA inspected facility FDA Registration: 16906175560 Since 1996

Made in USA with ingredients sourced worldwide Made in our GMP & FDA inspected facility OU (Kosher)

Some settling of contents may have occurred during the shipping and handling.

Store in a cool dry place.

Serving scoop included.

150g powder

Product Details

UPC / SKU 6 49908 24510 8
DSLD Entry Date 2020-02-26
Product Type Non-Nutrient/Non-Botanical
Form Powder
Brand NutraBio
DSLD ID 212999
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
B The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
Meta Analysis Sleep medicine reviews 2025
B The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness
Rct Nutritional neuroscience 2010
B Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
Rct Nutrients 2019
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
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
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
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
B The combined effects of L-theanine and caffeine on cognitive performance and mood
Rct Nutritional neuroscience 2008
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
View all evidence for L Theanine →

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