L-Theanine®

Non-Nutrient / Non-Botanical

Brand: Pure Encapsulations

CapsuleNon-Nutrient/Non-BotanicalOff Market

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

Net Contents

60 Capsule(s)

Serving Size

2 Capsule(s)

Servings Per Container

Supplement Form

Capsule

Bar Code (UPC/SKU)

7 66298 00542 3

Product Version

code: LTH6 v5

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.

2Dietary Attributes

Label states: Non-GMO, 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

Free From

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: 2 Capsule(s) · 1–3 per day

Ingredient	Amount Per Serving
L-Theanine	400 mg	—

Not Present

Other Ingredients

CelluloseWaterhypoallergenic Plant Fiber

Target Groups

Adult (18 - 50 Years)Gluten Free

Label Claims

All OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Recommendations: As a dietary supplement, take 2 capsules, 1-3 times daily, between meals.

Warnings & Precautions

Precautions re: Pregnant or Nursing or Prescription Medications

Warning: If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use.

Precautions re: Children

Keep out of the reach of children.

Precautions re: All Other

Use only if safety seal is intact.

Storage

Store in a cool, dry place.

Formulation

Formulation re: Does NOT Contain

Certified gluten-free by the Gluten-Free Certification Organization, www.gluten.org

Formula re: Contains

L-Theanine with Suntheanine; Promotes relaxation

Formulation re: Does NOT Contain

Gluten-free, Non-GMO & hypoallergenic

Formulation re: Other

Gluten-free, Non-GMO & hypoallergenic

FDA Statements

FDA Statement of Identity

Dietary Supplement

FDA Disclaimer Statement

This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Other Label Statements

General Statements: All Other Content

Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. Scan to learn about our hypoallergenic supplements

Seals/Symbols

GFCO.org (Gluten-Free Certification Organization)

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

Suntheanine is a registered trademark of Taiyo International, Inc.

Manufacturer & Distributor

Manufacturer

Pure Encapsulations

490 Boston Post Road, Sudbury, MA

1-800-753-2277

Market Reference

$10.00 – $115.00· 40 listings

L-Theanine Pure Encapsulations
Pure For You4.7(149)
$65.50
Pure Encapsulations l-Theanine
Harrison Pharmacy & Wellness4.7(149)
$61.00
Pure Encapsulations - L-Theanine
EarthTurns.com4.7(149)
$65.50
Pure Encapsulations L-Theanine
mountainsidepharmacy.org/online-store4.7(149)
$107.00
Pure Encapsulations l Theanine
Waters Wellness4.7(149)
$65.50
L-Theanine by Pure Encapsulations
Cincinnati Health Institute4.7(149)
$115.00
Pure Encapsulations Daily Calm 60 Capsules
Pure For You5.0(4)
$50.00
Pure Encapsulations Daily Stress Formula 90 Capsules
Pure Prescriptions4.9(58)
$41.50

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
4.5 (11)
Vitamin & supplements store
2111 Queen Anne Ave N Ste 101, Seattle, WA 98109
Directions (206) 395-7842
Vital Nutritionals
5.0 (1)
Vitamin & supplements store
4031 Aurora Ave N STE 100, Seattle, WA 98103
Directions (206) 268-0473
The Vitamin Shoppe
4.4 (140)
Vitamin & supplements store
13500 Aurora Ave N, Seattle, WA 98133
Directions (206) 365-5240
City Supplements
4.6 (87)
Vitamin & supplements store
70 Andover Park W, Tukwila, WA 98188
Directions (206) 556-2155
Natuspur
Vitamin & supplements store
2334 Elliott Ave, Seattle, WA 98121
Directions (833) 628-8778
Pike Place Nutrition
2.9 (12)
Health food store
1501 LL# 416, Seattle, WA 98101
Directions (206) 623-2231
NATURAL STACKS
3.0 (4)
Vitamin & supplements store
4241 24th Ave W, Seattle, WA 98199
Directions (855) 678-2257
The Vitamin Shoppe
4.3 (171)
Vitamin & supplements store
14733 NE 8th St, Bellevue, WA 98007
Directions (425) 957-0787

Research & Studies

Effects of combined GABA and L-theanine supplementation on sleep quality: an exploratory study
H Konno, K Naganuma… - … review for medical and …, 2026 - europeanreview.org
… the use of test supplements (GABA and L-theanine) from the start of supplement intake. The … GABA 700 mg and L-theanine 200 mg; PURE Encapsulations, Nestle Health Science, Tokyo…
2026
An Exploratory Study to Detect the Effects of the Combined Intake of Gamma-aminobutyric Acid (GABA) and L-theanine on Sleep by Wearable Device
H Konno, R Murotani, Y Kamada - medRxiv, 2023 - medrxiv.org
… ) taken from the start of supplement intake. The participants took the study supplements GABA 700 mg and L-theanine 200 mg (PURE Encapsulations, Nestle Health Science, Tokyo, …
20232 citations
l-theanine: From tea leaf to trending supplement–does the science match the hype for brain health and relaxation?
R Dashwood, F Visioli - Nutrition Research, 2025 - Elsevier
… of this nutraceutical supplement marketed for brain health and … in the use of l-theanine supplements at pharmacologic doses … this trending supplement for brain health and relaxation. …
202525 citations
Calcium alginate STB microgels co-administering L-theanine and Blautia coccoides are associated with ameliorate obesity and metabolic syndrome in mice …
L Li, Z Huang, J Liang, Y Jin, W Peng - Chemical Engineering Journal, 2026 - Elsevier
… evolved into a global public health crisis, often rooted in … high relative abundance in the healthy adult gut and often … is significantly lower than in healthy populations. Moreover, its …
2026
L-theanine: A potential multifaceted natural bioactive amide as health supplement
R Adhikary, V Mandal - Asian Pacific Journal of Tropical Biomedicine, 2017 - Elsevier
… in modern therapeutics, which are used to prepare antibiotics, growth supplements or some other therapeutics. l-theanine is such a bioactive amide amino acid presented in different …
201778 citations
Examining the effect of L-theanine on sleep: a systematic review of dietary supplementation trials
J Cotter, CE Caddick, JL Harper… - Nutritional …, 2026 - Taylor & Francis
… Though many of the included studies were conducted using healthy adults in Japan, beneficial effects of L-theanine on sleep related-measures were also reported in randomised, …
20269 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2023-06-22. DSLD Label ID: 293999. 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.