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L-Theanine 200 mg

product on market Capsule AN Amazing Nutrition Amazing Formulas 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

L-theanine is an amino acid supported by strong evidence for its ability to promote relaxation and reduce stress without causing sedation. Research indicates it may improve cognitive focus and attention when combined with caffeine. This ingredient profile is generally recognized as safe for adult consumption.

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 Vcap(s)
Serving Size
120
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)

Other Ingredients

Cellulose Cellulose Magnesium Stearate Silica
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

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

Metadata

Product Details

UPC / SKUL-Theanine 200 mg
DSLD Entry Date2021-07-27
Product TypeNon-Nutrient/Non-Botanical
FormCapsule
DSLD ID251936
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.