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 supported by strong evidence for its ability to promote relaxation and reduce stress without causing sedation. Research indicates it may improve cognitive focus when paired with caffeine. The ingredient maintains a high safety profile for general consumption.
AI-generated summary based on research evidence. Not medical advice.
Details
Label Data
Amino acid/Protein
Product Type
Ingredients
Supplement Facts — Evidence Check
Market median: 200.0mg (358 products)
9 studies (A:0, B:2)
Claims
Label Claims — Verification
Unverified
All Other
Unverified
Structure/Function
Info
Product Information
Directions for Use
Directions: As a dietary supplement, take 100 mg (scant 1/16 tsp) to 250 mg (1/8 tsp) one to three times daily.
Warnings & Precautions
Warning: This product is not intended for use by those with a serious medical condition or pregnant or lactating women.
Consult your physician before use.
Keep out of reach of children.
WARNING: Do not use if you are taking blood pressure medication.
Formulation Notes
Free of: sugar, soy, dairy, yeast, gluten, corn and additives.
Additional Information
Storage: Keep dry, cool & dark
US Standard Measuring Spoons Spoon Size (level) milligrams 1/16 teaspoon 121 1/8 teaspoon 243 1/4 teaspoon 487
Metadata
Product Details
DSLD Entry Date2013-06-25
Product TypeAmino acid/Protein
FormPowder
Data Updated2026-04-11
Research
Research Evidence
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
B
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
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
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
B
The combined effects of L-theanine and caffeine on cognitive performance and mood
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 →
This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.
