200 mg of Zen
100/100
This product looks safe
- No ingredients exceed tolerable upper intake levels
- 50% of ingredients have research evidence
A
Label Compliance Grade
Product Label
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Label Data
1 Capsule(s)
Serving Size
30
Servings
Non-Nutrient/Non-Botanical
Product Type
50%
Evidence Coverage
Supplement Facts — Evidence Check
Gamma-Aminobutyric Acid
550 mg
200 mg
📊 Market median: 200.0mg (358 products)
📚 9 studies (Tier A: 0, B: 2)
Other Ingredients
Hydroxypropyl Methylcellulose
Microcrystalline Cellulose
Rice Hull Concentrate
Gum Arabic
Sunflower Oil
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)
Product Information
📋 Directions for Use
Suggested Use As a dietary supplement, 1 or 2 capsules daily between meals, or as directed by a healthcare practitioner.
⚠️ Warnings & Precautions
Warning: If taking antidepressants or other psychotropic medications, use only under the supervision of a qualified healthcare practitioner.
Although we are not aware of any interactions, because these also affect brain function there is theoretical potential for negative or positive interactions, either of which would need to be monitored.
🧪 Formulation Notes
200 mg of Zen contains a combination of L-theanine and GABA. L-theanine is found in green tea (Camellia sinensis).
Calmness Support Day or Night
Hypoallergenic
Additional Information
Keep in a cool, dry place, tightly capped.
Product Details
UPC / SKU
7 13947 74700 5
DSLD Entry Date
2024-03-22
Product Type
Non-Nutrient/Non-Botanical
Form
Capsule
Brand
Allergy Research Group
DSLD ID
304223
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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