100% Pure L-Tryptophan 500 Milligrams®

Amino Acids & Protein

Brand: NutraBio

CapsuleAmino acid/ProteinOn Market

Functions

Sleep, Mood & Stress

Product label for 100% Pure L-Tryptophan 500 Milligrams — Click to view full label

Net Contents

500 Cap(s)

Serving Size

1–2 Vegetable Capsule(s)

Servings Per Container

500

Supplement Form

Capsule

Bar Code (UPC/SKU)

6 49908 23557 4

Product Version

23557-005 B20035-003

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.

4Dietary Attributes

Label states: Vegetarian, Non-GMO, Gluten-Free, Kosher.

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: 1–2 Vegetable Capsule(s) · 1–2 per day

Ingredient	Amount Per Serving
L-Tryptophan	500 mg	—

Not Present

Other Ingredients

Vegetable Capsule

Target Groups

VegetarianAdult (18 - 50 Years)KosherNo AllergiesGluten Free

Label Claims

All OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

1-2 capsule(s) - 1-2x daily - Best if taken empty stomach Suggested Use: As a dietary supplement, 1-2 capsules on an empty stomach, 1-2 times daily, or as directed by your physician. For maximum benefit, take up to 3 grams per day. As a sleep aid, take 1-3 capsules 30 minutes before bedtime, during the night if required, or as needed.

Warnings & Precautions

Precautions re: Children

Warning: Not Intended for use by persons under the age of 18. Keep out of the reach of children.

Precautions re: Pregnant or Nursing or Prescription Medications

If you are pregnant, breast feeding, have known medical conditions (including kidney or liver disease) or are taking prescription or OTC medication(s) consult with your health care practitioner before using this product. Caution!: If you are currently taking, or within the last 90 days have taken, any anti-stress, anti-anxiety, or anti-depression medications do not take L-Tryptophan without first talking to your prescribing physician.

Storage

Store in a cool dry place.

Formulation

Formulation re: Does NOT Contain

- Allergen free - Non-GMO - Gluten free - BSE/TSE free

Formulation re: Vegetarian/Vegan

Vegeterian

Formula re: Type

- Allergen free

Formulation re: Does NOT Contain

- No fillers - No excipients - No additives Free of harmful impurities.

Formulation re: Does NOT Contain

Zero fillers or excipients inferior ingredients banned substances - added sugars proprietary blends hidden ingredients

Formulation re: Does NOT Contain

Kosher, Vegetarian, Hypoallergenic, Non-GMO, Gluten free and BSE/TSE free. No added sugars, salt, preservatives, salicylates, or artificial color, flavor or fragrance.

Formula re: Kosher

Kosher, Vegetarian, Hypoallergenic, Non-GMO, Gluten free and BSE/TSE free.

Formulation re: Vegetarian/Vegan

Kosher, Vegetarian, Hypoallergenic, Non-GMO, Gluten free and BSE/TSE free.

Formula re: Type

Kosher, Vegetarian, Hypoallergenic, Non-GMO, Gluten free and BSE/TSE free.

FDA Statements

FDA Statement of Identity

Dietary Supplement

FDA Disclaimer Statement

These statements have 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

Manufactured in a GMP & FDA inspected facility

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

Amino Therapy

General Statements: All Other Content

Made in a GMP & FDA inspected facility

General Statements: All Other Content

Free form amino acid

General Statements: All Other Content

Pharmaceutical grade. HPLC lab tested for potency.

General Statements: All Other Content

500 servings 500 milligrams

Seals/Symbols

TRUE LABEL FULL LABEL DISCLOSURE

Seals/Symbols

General: Product/Version Code

23557-005 B20035-003

General Statements: All Other Content

Since 1996

General Statements: All Other Content

Made in USA

General Statements: All Other Content

Vegetable Capsule

General Statements: All Other Content

Quality and purity since 1996. NutraBio manufactures in our own FDA registered & inspected GMP facility complying with FDA 21 CFR Part 111 regulations.

Manufacturer & Distributor

Manufacturer

NutraBio Labs, Inc.

564 Lincoln Blvd., Middlesex, NJ , 08846

732-748-8606

Market Reference

$2.75 – $67570.00· 40 listings

Sleep 90 Capsules
iHerb4.4(21)
$49.99
Nutricost L- Tryptophan Capsules
iHerb4.6(1700)
$15.95
Now Foods L-Tryptophan
Wonder Laboratories4.6(5600)
$23.39
(2 pack) NOW Supplements, L-Tryptophan 500 mg, Encourages Positive Mood*, Supports Relaxation*, 60 Veg Capsules, Size: 4.35, Other
Walmart - Fruitful Yield4.6(5600)
$29.72
Best Naturals L- Tryptophan 500 Mg 120 Capsules
Target
$26.95
NOW Foods L- Tryptophan Relaxation Support Capsules
Professional Supplement Center4.6(4100)
$17.99
L- Tryptophan Supplement Powder
Walmart - BulkSupplements.com4.9(119)
$28.97
Source Naturals L Tryptophan
Curated Wellness4.6(1100)
$18.25

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.

Holland & Barrett - Halifax
4.0 (28)
Vitamin & Supplements Shop
The Woolshops Unit 26, Halifax HX1 1RU
Directions 0330 058 2640
Hi-Definition
4.9 (88)
Vitamin & Supplements Shop
331 Kirkstall Rd, Burley, Leeds LS4 2HD
Directions 0113 279 6000
Lions Den Supplements
5.0 (18)
Vitamin & Supplements Shop
180 King Cross Rd, Halifax HX1 3LN
Directions 07448 620822
Insight Supps Ltd
4.9 (91)
Vitamin & Supplements Shop
Crowgill Chambers, Rosse St, Shipley BD18 3FB
Directions 01274 581281
The Supplement Shop
5.0 (26)
Vitamin & Supplements Shop
Flanshaw Court Flanshaw Way, Flanshaw Trading Estate, 8 Flanshaw Way, Wakefield WF2 9LP
Directions 01924 239803
Active Sports Nutrition Supplies
4.5 (65)
Vitamin & Supplements Shop
Albert Works, Albert St, Lockwood, Huddersfield HD1 3QG
Directions 01484 353588
Holland & Barrett - Huddersfield
4.0 (38)
Vitamin & Supplements Shop
Unit 3, Kingsgate Centre, King St, Huddersfield HD1 2QB
Directions 0330 058 2640
Stronglife
5.0 (6)
Vitamin & Supplements Shop
89-93 Manningham Ln, Bradford BD1 3BN
Directions

Research & Studies

Analysis, nutrition, and health benefits of tryptophan
M Friedman - International Journal of Tryptophan Research, 2018 - journals.sagepub.com
… Here, tryptophan refers to l-tryptophan and the isomeric form … following concentrations of tryptophan (in mg/100 g) in 6 food … the dietary supplementation of tryptophan to healthy adults (n …
2018402 citations
… in the plasma tryptophan-to-large-neutral-amino-acids ratio attenuates the effects of L-tryptophan on gut hormones and energy intake in healthy males: a randomized …
J Anjom-Shoae, M Hajishafiee, PCE Fitzgerald… - The American journal of …, 2025 - Elsevier
Background L-tryptophan (“Trp”) and L-leucine (“Leu”), when administered intraduodenally, increase plasma cholecystokinin (CCK) and glucagon-like peptide 1 (GLP-1) and stimulate …
20253 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2015-10-22. DSLD Label ID: 51199. 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.

100% Pure L-Tryptophan 500 Milligrams®

Net Contents

Serving Size

Servings Per Container

Supplement Form

Bar Code (UPC/SKU)

Product Version

Label Analysis

Allergen Guide

Supplement Facts

Other Ingredients

Target Groups

Label Claims

Directions & Suggested Use

Warnings & Precautions

Storage

Formulation

FDA Statements

Other Label Statements

Manufacturer & Distributor

Market Reference

Where to Buy Locally

Research & Studies

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