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L-Theanine 200 mg

product on market Capsule Country Life 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

Suntheanine is supported by strong evidence for promoting relaxation and reducing stress without drowsiness. Vitamin B6 serves as a cofactor in the synthesis of neurotransmitters that regulate mood. Together, these ingredients target cognitive calm and neurological support based on established research.

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

Label

Product Label

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

Label Data

1 Capsule(s)
Serving Size
30
Servings
Other Combinations
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

4.25 mg (250% DV)
3.3× RDA — above typical dose (UL: 100 mg) 114 studies (A:3, B:35)
200 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)

Other Ingredients

Cellulose Cellulose Magnesium Stearate Silica
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Directions: Adults take one (1) capsule daily on an empty stomach.

Warnings & Precautions

As a reminder, discuss the supplements and medications that you take with your health care providers.

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

Stop using and consult a doctor if any adverse reactions occur. Do not accept if seal is broken.

Keep out of the reach of children.

Formulation Notes

Country Life uses only Suntheanine, a form of L-Theanine with over 50 studies and patents. L-Theanine has been referred to as the happy amino for its ability to help reduce stress. It has also been shown to help diminish normal symptoms of PMS when taken 400 mg daily.

Yes Non-GMO project verified Yes certified gluten free by gfco.org No yeast, corn or wheat No soy, milk or salt No sugar or preservatives No artificial colors, flavors or sweeteners

Yes vegan by the AVA

Yes manufacturing supports wind power

Yes Kosher

Yes certified halal by Ifanca

Suntheanine

Certified gluten-free

Gently soothes away the tension Helps reduce stress

Includes vitamin B-6 for utilization

Non GMO Project Verified nongmoproject.org

Our Pledge of Integrity Authenticity Cleanliness Freshness Consistency Accuracy

This product has been manufactured at a GMP registered facility.

Additional Information

Yes recyclable packaging

Certified B Corporation Certified Gluten Free GFCO.org (Gluten-Free Certification Organization) IFANCA Certified Crescent M Halal K (Kosher)

Non GMO Project Verified nongmoproject.org

Store in a dry place between 59 degrees - 86 degrees F.

Metadata

Product Details

UPC / SKU0 15794 01411 9
DSLD Entry Date2025-08-22
Product TypeOther Combinations
FormCapsule
BrandCountry Life
DSLD ID333296
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.