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Suntheanine

product on market Tablet or Pill Natural Factors Stress-Relax Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 33% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

L-theanine is supported by strong evidence for its ability to promote relaxation and reduce stress without causing sedation. Research indicates it may improve attention and cognitive function when paired with caffeine. The overall evidence coverage for this specific formulation is limited.

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

Label

Product Label

Label for Suntheanine
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Tablet(s)
Serving Size
5
Servings
Non-Nutrient/Non-Botanical
Product Type
33%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Calories
15 {Calories}
Total Carbohydrates
4 Gram(s) (1% DV)
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)

Other Ingredients

Cane Sugar Xylitol Stearic Acid Silica natural Fruit Flavor Citric Acid Magnesium Stearate
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Usage: Chew 1–2 tablets 3 times per day or as directed by a health professional.

Warnings & Precautions

Keep out of reach of children.

Sealed for your protection. Do not use if seal is broken.

Formulation Notes

Contains no artificial preservatives, color or sweeteners; no dairy, gluten, soy, wheat or yeast.

L-Theanine

Additional Information

For freshness, store in a cool, dry place.

PRODUCT OF CANADA

Recyclable container and label.

Purity&Potency Guaranteed

For Mental Calmness & Relaxation* Recommended by Dr. Michael Murray

Suntheanine(R)

R0

Metadata

Product Details

UPC / SKU0 68958 28313 5
DSLD Entry Date2014-08-26
Product TypeNon-Nutrient/Non-Botanical
FormTablet or Pill
BrandNatural Factors Stress-Relax
DSLD ID36590
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.