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L-Theanine Liquid

product on market Liquid NuMedica Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 67% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

AI-generated · Qwen 3.6 · methodology

L-theanine and chamomile extract are supported by moderate to strong evidence for promoting relaxation and reducing anxiety. These ingredients work by modulating neurotransmitters and calming the nervous system. Stevia is included as a non-caloric sweetener with a well-established safety profile.

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

Label

Product Label

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

Label Data

40 Drop(s)
Serving Size
30
Servings
Other Combinations
Product Type
67%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

200 mg
Market median: 200.0mg (358 products) 9 studies (A:0, B:2)
Market median: 400.0mg (142 products) 10 studies (A:0, B:2)
Stevia (Stevia rebaudiana) (leaf) extract
12.5 mg

Other Ingredients

purified Water Vegetable Glycerin Gum Arabic natural Lemon flavor Malic Acid
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Directions: Take two droppers (40 drops) 1-2 times per day mixed in water or as directed by your healthcare practitioner.

Warnings & Precautions

Caution: Keep out of reach of children.

Formulation Notes

L-Theanine is a naturally occurring, unique amino acid found in green tea leaves. NuMedica's L-Theanine is Suntheanine, the most respected source and the one which has been used in scientific studies.

This formula meets or exceeds cGMP quality standards.

Does Not Contain: Milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soy, artificial colors, sweeteners or preservatives.

Professional quality formulas

Relaxation & stress support

Featuring Suntheanine

GF Gluten-free

Vegetarian

Additional Information

Storage: Keep tightly closed in a cool, dry place.

Advancing nutrition

Produced and packaged in the US.

Metadata

Product Details

UPC / SKU8 12527 01307 0
DSLD Entry Date2020-01-25
Product TypeOther Combinations
FormLiquid
DSLD ID213570
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.