L-Theanine
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 Vegetarian Capsule(s)
Serving Size
60
Servings
Non-Nutrient/Non-Botanical
Product Type
100%
Evidence Coverage
Supplement Facts — Evidence Check
100 mg
📊 Market median: 200.0mg (358 products)
📚 9 studies (Tier A: 0, B: 2)
Other Ingredients
Microcrystalline Cellulose
Dicalcium Phosphate
Hydroxypropyl Methylcellulose
Vegetable Stearate
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
Product Information
📋 Directions for Use
Suggested Usage: As a dietary supplement, adults take 1 capsule daily or as directed by your healthcare professional.
⚠️ Warnings & Precautions
Warning: If you are pregnant, nursing, have any health condition or taking any medication, consult your health professional before using this product.
Keep out of the reach of children.
Use only if safety seal is intact.
🧪 Formulation Notes
Gluten-free, Non-GMO
Promotes relaxation and neurological health
Additional Information
Store in a cool, dry place.
Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. Scan to learn about our manufacturing excellence
Product Details
UPC / SKU
3 10539 01950 4
DSLD Entry Date
2020-08-23
Product Type
Non-Nutrient/Non-Botanical
Form
Capsule
Brand
Douglas Laboratories
DSLD ID
232181
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
B
The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
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
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
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
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