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L-Theanine 200 mg

product on market Tablet or Pill Lamberts Healthcare Safety: 100/100
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 an amino acid associated with promoting relaxation and reducing stress levels. There is strong evidence supporting its ability to improve attention and cognitive function when combined with caffeine. Research indicates it generally maintains a high safety profile for most healthy adults.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for L-Theanine 200 mg
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Tablet(s)
Serving Size
60
Servings
Non-Nutrient/Non-Botanical
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

200 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)

Other Ingredients

Calcium Carbonate L-Theanine Cellulose Anti-Caking Agents cross-linked Cellulose Gum Tablet Coating
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Info

Product Information

Directions for Use

Directions: Take 1 tablet with a meal, or as directed by a practitioner or pharmacist.

Warnings & Precautions

To be taken on the advice of a practitioner or pharmacist only.

Do not exceed recommended daily dose. Food supplements should not replace a balanced diet and a healthy lifestyle.

Caution: Do not take if pregnant or breast feeding.

Keep away from children.

Formulation Notes

Pure, Free-Form Fast Release

Lamberts amino acids are presented in their free-form, which means that they are ready to be absorbed and used by the body.

Suitable for vegetarians Suitable for vegans

Additional Information

Store in a cool, dry place.

The Professional Range

Metadata

Product Details

UPC / SKU5 055148 405397
DSLD Entry Date2021-06-23
Product TypeNon-Nutrient/Non-Botanical
FormTablet or Pill
BrandLamberts Healthcare
DSLD ID251060
Data Updated2026-04-11
Research

Research Evidence

37
Research Sources
53
Avg Quality
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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This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.