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L-Theanine

product on market Capsule Whole Foods 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 a patented form of L-theanine used to promote relaxation and reduce stress. There is strong evidence supporting its ability to lower anxiety and improve focus without causing sedation. The ingredient profile maintains a high safety rating for general consumption.

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

Label

Product Label

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

Label Data

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

Supplement Facts — Evidence Check

100 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)

Other Ingredients

RICE FLOUR Cellulose Silicon Dioxide MAGNESIUM STEARATE
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

DIRECTIONS: TAKE 1 CAPSULE, UP TO TWO TIMES PER DAY WITH WATER OR JUICE ON AN EMPTY STOMACH.

Warnings & Precautions

NOTE: IF YOU ARE PREGNANT, NURSING, HAVE ANY HEALTH CONDITION OR ARE TAKING ANY MEDICATIONS CONSULT YOUR HEALTH CARE PRACTITIONER BEFORE USING THIS PRODUCT.

TAMPER EVIDENT, USE ONLY IF SEAL IS INTACT

ALLERGEN INFORMATION: PROCESSED IN A FACILITY THAT ALSO PROCESSES TREE NUTS, MILK, EGGS, SHELLFISH, FISH, WHEAT AND SOY.

KEEP OUT OF REACH OF CHILDREN.

Formulation Notes

ALLERGEN INFORMATION: CONTAINS SHELLFISH (SHRIMP, CRAB) INGREDIENTS. GOOD MANUFACTURING PRACTICES USED TO SEGREGATE INGREDIENTS IN A FACILITY THAT ALSO PROCESSES TREE NUTS, MILK, EGG, FISH, WHEAT AND SOY INGREDIENTS.

CONTAINS NO ARTIFICIAL COLORS, FLAVORS OR PRESERVATIVES.

Additional Information

Suntheanine(R)

{recycle} 1 PETE

PLEASE RECYCLE THIS BOTTLE

100% PCR Post Consumer Recycled Bottle

PRODUCT OF USA

Supports Non-Drowsy Mental and Physical Relaxation

(Q) WHOLE FOODS MARKET QUALITY STANDARDS

STORE IN A COOL, DRY PLACE.

100 mg

L-THEANINE IS AN AMINO ACID FOUND IN GREEN TEA THAT PROMOTES NON-DROWSY RELAXATION.

Metadata

Product Details

UPC / SKU0 99482 28523 4
DSLD Entry Date2013-10-25
Product TypeNon-Nutrient/Non-Botanical
FormCapsule
DSLD ID26547
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.