L-Theanine®

Non-Nutrient / Non-Botanical

Brand: Douglas Laboratories

CapsuleNon-Nutrient/Non-BotanicalOff Market

Product label for L-Theanine — Click to view full label

Net Contents

60 Vegetarian Capsule(s)

Serving Size

1 Vegetarian Capsule(s)

Servings Per Container

Supplement Form

Capsule

Bar Code (UPC/SKU)

3 10539 01950 4

Product Version

Formula #98740

Label Analysis

Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.

1Active Ingredients

Single-ingredient formula listed in Supplement Facts.

100%Amount Transparency

Every active ingredient discloses a specific amount per serving.

1Dietary Attributes

Label states: Gluten-Free.

This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.

Allergen Guide

Contains

Milk
Wheat
Soy
Gluten

Allergen flags are parsed automatically from the official label's claims and statements. Always verify against the physical product label before use, especially if you have a severe allergy.

Supplement Facts

Serving Size: 1 Vegetarian Capsule(s) · 1 per day

Ingredient	Amount Per Serving
L-Theanine	100 mg	—

Not Present

Other Ingredients

CelluloseDicalcium PhosphateVegetable Stearate

Target Groups

Adult (18 - 50 Years)Gluten FreeDairy FreeSugar Free

Label Claims

All Other

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Suggested Usage: As a dietary supplement, adults take 1 capsule daily or as directed by your healthcare professional.

Warnings & Precautions

Precautions re: All Other

Tamper resistant package, do not use if outer seal is missing.

Precautions re: All Other

Excessive consumption may impair ability to drive or operate heavy machinery. Not recommended for consumption with alcoholic beverages.

Precautions re: Pregnant or Nursing or Prescription Medications

Warning: If you are pregnant or breastfeeding, or if you are taking any prescription medication, consult a physician prior to use.

Precautions re: Children

KEEP OUT OF REACH OF CHILDREN.

Storage

For optimal storage conditions, store in a cool, dry place. (59(0)-77(0)F/15(0)-25(0)C) (35-65% relative humidity)

Formulation

Formulation re: Does NOT Contain

This product contains NO yeast, wheat, gluten, soy, milk/dairy, corn, sodium, sugar, starch, artificial coloring, artificial preservatives or genetically modified organisms (GMOs).

FDA Statements

FDA Statement of Identity

A Dietary Supplement

Other Label Statements

General: Product/Version Code

Formula #98740

Brand IP Statement(s) re: (c), (TM), (SM)

Suntheanine is a registered trademark of Taiyo International Inc.

Manufacturer & Distributor

Manufacturer

Douglas Laboratories

600 Boyce Road, Pittsburgh, PA, 15205, USA

1.800.245.4440

Market Reference

$10.89 – $1109.55· 40 listings

Douglas Laboratories L-Theanine 60 Capsules
Covenant Health Products4.7(15)
$42.50
Nature Made Chewable L Theanine Tablets
Walmart4.4(68)
$12.74
Pure L-Theanine
PartiQlar
$27.99
Douglas Laboratories Sereniten Plus
Blue Sky Vitamin4.8(48)
$58.00
Nootropics Depot L-Theanine Capsules
Nootropics Depot4.5(15)
$15.99
Sports Research L-Theanine Suntheanine Softgels
Sports Research4.7(1100)
$38.95
L-Theanine
Pure Prescriptions
$30.99
L-THEANINE 200 capsules
NutriKey4.8(27)
$21.50

Where to Buy Locally

Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.

Showing representative supplement & health retailers — search above for stores in your area.

GNC
3.4 (39)
Vitamin & supplements store
1801 Howell Mill Rd NW, Atlanta, GA 30318
Directions (404) 351-5340
Vita Life Source
5.0 (1)
Vitamin & supplements store
2293 Peachtree Rd, Atlanta, GA 30309
Directions (855) 667-6872
Discount Nutrition
4.8 (58)
Vitamin & supplements store
1544 Piedmont Rd NE Ste 318, Atlanta, GA 30324
Directions (404) 228-2712
The Vitamin Shoppe
3.9 (212)
Vitamin & supplements store
1209 Caroline St NE, Atlanta, GA 30307
Directions (404) 659-3127
Herb Shop of Vinings
4.8 (193)
Vitamin & supplements store
2250 Marietta Blvd NW #214, Atlanta, GA 30318
Directions (770) 984-9323
Total Nutrition Atlanta
4.8 (174)
Vitamin & supplements store
6597-G Roswell Rd NE, Sandy Springs, GA 30328
Directions (404) 481-5263
YourVitaminLady Herb Shop
4.8 (562)
Herb shop
392 Auburn Ave NE, Atlanta, GA 30312
Directions (404) 524-8558
Good Nutrition
4.5 (118)
Vitamin & supplements store
2855 N Druid Hills Rd NE, Atlanta, GA 30329
Directions (404) 929-8900

Research & Studies

Chronic Fatigue Syndrome Nutritional Supplementation Helps Reduce the Symptoms & Progression of Chronic Fatigue Syndrome
LR McNamara - drladdvip.com
… disclaimer after the article, and consult your personal health … L-theanine is an amino acid derived from green tea. It is not … You can buy from Douglas Labs by first creating a customer …
Safety and Efficacy of AlphaWave®l-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress: A Randomized, Double-Blind, Placebo …
M Moulin, DC Crowley, L Xiong, N Guthrie… - Neurology and …, 2024 - Springer
… AlphaWave ® l-Theanine has been previously shown to … l-Theanine on stress among a moderately stressed, healthy … the safety and benefits of the longer-term use of l-theanine for self-…
202427 citations
The effects of L-theanine consumption on sleep outcomes: A systematic review and meta-analysis
A Bulman, NM D'Cunha, W Marx, M Turner… - Sleep medicine …, 2025 - Elsevier
… This systematic review ansd meta-analysis aimed to evaluate the effects of L-theanine, a non-… of L-theanine supplementation on sleep quality in humans of all ages and health status …
202535 citations
AUTISM Spectrum Disorders
L McNamara - drladdvip.com
… medical … Douglas Labs, which are: Pyridoxal-5-Phosphate 50 mg, GABA 500 mg, N-acetyl-L-cysteine (NAC) 500 mg or 750 mg, 5-HTP-Plus 75 mg, Ultra Lipoic Forte, and L-Theanine …
Common questions and misconceptions about energy drinks: What does the scientific evidence really show?
J Antonio, B Antonio, SM Arent, DG Candow… - Nutrients, 2024 - mdpi.com
… directed to the previously mentioned publications [16,17] which provides a more in-depth discussion of the mechanisms of action and any documented health and performance benefits. …
202418 citations
IMMUNE SUPPORT
L McNamara - drladdvip.com
… L-Theanine, DHEA, 50 mg micronized capsule, and Acetyl-L-Carnitine, can be purchased from Douglas Labs … your own doctor or health professional, not to replace medical advice. The …

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2016-02-23. DSLD Label ID: 56864. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.