L-Theanine 100 mg

product on market Capsule Seeking Health 🟢 Safety: 100/100
Brand: Seeking Health
🟢 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 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)
This product: 100mg

Other Ingredients

Microcrystalline Cellulose Vegetarian Capsule L-Leucine Cellulose Silicon Dioxide

Label Claims — Verification

❓ All Other
All Other (99% of products) Structure/Function (92% of products) Nutrient (22% of products)

Target Groups

Adult (18 - 50 Years) Gluten Free Dairy Free

Product Information

📋 Directions for Use

Suggested Use: 1 capsule, 1 to 2 times daily or as directed by your healthcare professional.

⚠️ Warnings & Precautions

Children and pregnant or lactating women should consult their healthcare professional prior to use.

Children and pregnant or lactating women should consult their healthcare professional prior to use.

Do not use if shrinkwrap is broken or missing.

Keep out of reach of children.

🧪 Formulation Notes

Does Not Contain: milk/casein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, yeast, and soybeans. Contains no artificial colors, flavors, or preservatives.

Additional Information

Storage: Store in a cool, dry place below 85 degrees F away from direct light. Do not freeze.

L-Theanine meets or exceeds cGMP Quality Standards. Targeted Support

Find Other Effective Health Products At: www.SeekingHealth.com

Product Details

UPC / SKU 8 10007 52063 6
DSLD Entry Date 2020-01-25
Product Type Non-Nutrient/Non-Botanical
Form Capsule
Brand Seeking Health
DSLD ID 210854
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
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
View all evidence for L Theanine →

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