L-Theanine
90/100
This product looks safe
- Contains proprietary blend — exact ingredient amounts not disclosed
- 60% of ingredients have research evidence
A
Label Compliance Grade
Product Label
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Safety Alerts
ℹ️ Contains proprietary blend — exact ingredient amounts not disclosed
Label Data
1 Capsule(s)
Serving Size
90
Servings
Other Combinations
Product Type
60%
Evidence Coverage
Supplement Facts — Evidence Check
0.4 mg
(4% DV)
📊 Market median: 18.0mg (1009 products)
📚 258 studies (Tier A: 6, B: 134)
0.03 mg
(3% DV)
📊 Market median: 2.0mg (138 products)
📚 36 studies (Tier A: 0, B: 11)
3 mg
(130% DV)
✅ 1.3× RDA — within safe limits
📚 8 studies — no high-quality reviews
200 mg
📊 Market median: 200.0mg (358 products)
📚 9 studies (Tier A: 0, B: 2)
Proprietary Blend
385 mg
Other Ingredients
Gelatin
Microcrystalline Cellulose
Magnesium Stearate
Label Claims — Verification
❓
Nutrient
❓
All Other
❓
Structure/Function
All Other (99% of products)
Structure/Function (92% of products)
Nutrient (22% of products)
Target Groups
Adult (18 - 50 Years)
Product Information
📋 Directions for Use
Suggested use: As a dietary supplement, take 1 capsule, with meals, 3 times per day.
⚠️ Warnings & Precautions
Caution: Do not exceed recommended dose. Do not use if safety seal is damaged or missing.
Pregnant or nursing mothers, children under the age of 18, and individuals with known medical conditions should consult a physician before using this or any dietary supplement.
Pregnant or nursing mothers, children under the age of 18, and individuals with known medical conditions should consult a physician before using this or any dietary supplement.
🧪 Formulation Notes
Adrenal support
L-theanine + L-tyrosine + Ashwagandha + Desiccated adrenal
Additional Information
Store in a cool, dry place, with a lid.
To reorder: shop.drberg.com
Product Details
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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