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L-Theanine 150 mg

product on market Capsule Solgar 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 used to promote relaxation and reduce stress levels. There is moderate to strong evidence supporting its ability to improve focus and calm the mind without causing sedation. This specific formulation utilizes Suntheanine, a patented form of the ingredient.

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

Label

Product Label

Label for L-Theanine 150 mg
Open Full PDF View on NIH DSLD →
Details

Label Data

1 Vegetable Capsule(s)
Serving Size
Non-Nutrient/Non-Botanical
Product Type
100%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

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

Other Ingredients

Vegetable Cellulose Microcrystalline Cellulose Silica Vegetable Magnesium Stearate
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested use: As a dietary supplement for adults, take one (1) vegetable capsule twice daily, between meals, or as directed by a healthcare practitioner.

Warnings & Precautions

If you are pregnant, nursing, taking any medications or have a medical condition, please consult your healthcare practitioner before taking any dietary supplement.

Discontinue use and consult your healthcare practitioner if any adverse reactions occur.

Keep out of reach of children.

Do not use if outer bottle seal is missing or damaged.

Formulation Notes

L-Theanine is an amino acid which is commonly found in green tea. It plays a key role in mood support and interacts with the neurotransmitter GABA (gamma aminobutyric acid). GABA is an inhibitory neurotransmitter important for nervous system function. Supplementation with L-Theanine can help promote a calm, relaxed mood. This formulation provides Free Form, patented L-Theanine as Suntheanine to promote optimal absorption and assimilation.

Solgar’s KOF-K certification #K-1250

Non-GMO Gluten, wheat & dairy free

Suitable for vegans

Free of: Gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener, preservatives and color.

Additional Information

SOLGB72706 02D

Since 1947 Free form Mood support Promotes relaxation

GF Certified Gluten-free K Parve

Store at room temperature.

Metadata

Product Details

UPC / SKU0 33984 02706 0
DSLD Entry Date2019-04-25
Product TypeNon-Nutrient/Non-Botanical
FormCapsule
BrandSolgar
DSLD ID201642
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.