🟢 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 Vcap(s) Serving Size
120 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

Cellulose Cellulose Magnesium 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

Adult (18 - 50 Years) Gluten Free Dairy Free Sugar Free

Product Information

📋 Directions for Use

Suggested Use: As a dietary supplement, adults take one (1) vegetarian capsule daily on an empty stomach or as directed by a health care professional.

⚠️ Warnings & Precautions

Keep out of reach of children

Do not use if safety seal is damaged or missing

Caution: If you are pregnant or nursing, taking medication or planning a surgery, consult your doctor before using this product.

Discontinue use and consult your doctor if any adverse reactions occur.

🧪 Formulation Notes

L-Theanine is a relaxing and non-dietary amino acid found in tea leaves. L-Theanine helps to regulate aspects of brain function in humans. More specifically, L-Theanine helps to increase the activity in the alpha frequency band which indicated that it relaxes the mind without inducing drowsiness. L-Theanine may also help to reduce stress and promote cognition and mental alertness.

Supports relaxation Helps to reduce stress Promotes cognition & mental alertness

No artificial color, flavor or sweetener, no preservatives, no sugar, no starch, no milk, no lactose, no soy, no gluten, no wheat, no yeast, no fish. sodium free.

Additional Information

We believe that Amazing Nutrition is the key for healthy living. We are passionate about bringing you the finest selection of products which can perfectly complement a healthy diet and active lifestyle.

Store in a cool, dry place

Made in USA GMP Good Manufacturing Practice Quality Product

Product Details

UPC / SKU L-Theanine 200 mg
DSLD Entry Date 2021-07-27
Product Type Non-Nutrient/Non-Botanical
Form Capsule
DSLD ID 251936
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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