L-Tryptophan®

Botanicals with Nutrients

Brand: Douglas Laboratories

CapsuleBotanical with NutrientsOff Market

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

Net Contents

60 Vegetarian Capsules

Serving Size

2 Vegetarian Capsules

Servings Per Container

Supplement Form

Capsule

Bar Code (UPC/SKU)

3 10539 03414 9

Product Version

Formula #200448

Label Analysis

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

6Active Ingredients

6 distinct active ingredients are disclosed in Supplement Facts.

100%Amount Transparency

Every active ingredient discloses a specific amount per serving.

4% Daily Value Coverage

4 ingredients report a %DV; 2 meet or exceed 100% DV.

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: 2 Vegetarian Capsules · 1 per day

Ingredient	Amount Per Serving	% Daily Value
Vitamin C(Ascorbyl Palmitate)	10 mg	17%
Riboflavin(Riboflavin 5-Phosphate)	10 mg	588%
Niacin(Niacinamide)	10 mg	50%
Vitamin B6(Pyridoxal 5-Phosphate)	10 mg	500%
L-Tryptophan(TryptoPure)	1000 mg	—
Bioperine	5 mg	—

Not Present

Other Ingredients

CelluloseSilica

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 2 capsules daily or as directed by your healthcare professional.

Warnings & Precautions

Precautions re: Pregnant or Nursing or Prescription Medications

Warning: If you are taking medications for neurological conditions including Selective Serotonin Reuptake Inhibitors (SSRIs) or Monoamine Oxidase Inhibitors (MAOI), or are pregnant or nursing, do not use this product.

Precautions re: Children

Keep out of reach of children.

Precautions re: All Other

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

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 protein, milk/dairy, corn, sodium, sugar, starch, artificial coloring, preservatives or flavoring.

FDA Statements

FDA Statement of Identity

A Dietary Supplement

Other Label Statements

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

TryptoPure is a registered trademark of Ajinomoto AminoScience, LLC. Bioperine is a registered trademark of Sabinsa Corporation.

General: Product/Version Code

Formula #200448

Manufacturer & Distributor

Manufacturer

Douglas Laboratories

600 Boyce Road, Pittsburgh, PA, 15205, USA

1-800-245-4440

Market Reference

$9.99 – $395.00· 40 listings

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Horbaach L Tryptophan 1500mg 180 Capsules
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Walmart - VitaPulse5.0(1)
$17.95
The Vegan Shoppe L- Tryptophan 500mg 120 Veggie Capsules
The Vitamin Shoppe4.7(50)
$36.99
365 by Whole Foods Market, Free-Form L-Tryptophan 500mg, Vegan, 60 Capsules
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$18.99

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.

The Vitamin Shoppe
4.5 (275)
Vitamin & supplements store
3312 Greenwald Way N, Kissimmee, FL 34741
Directions (407) 931-2023
Top Tier Nutrition
4.9 (241)
Vitamin & supplements store
1509 Osceola Pkwy, Kissimmee, FL 34744
Directions (407) 201-2685
GNC
4.1 (86)
Vitamin & supplements store
2687 Osceola Pkwy Suite B5A, Kissimmee, FL 34741
Directions (407) 932-5217
Fitness Mart
5.0 (6)
Health food store
3831 W Vine St, Kissimmee, FL 34741
Directions (407) 870-0800
Vitamin World
3.3 (8)
Vitamin & supplements store
8200 Vineland Ave Ste 1791, Orlando, FL 32821
Directions (407) 239-4990
Salud Natural
4.9 (15)
Vitamin & supplements store
1319 E Vine St, Kissimmee, FL 34744
Directions (407) 334-6683
Revitalife Vitamins & Supplements
Vitamin & supplements store
3831 W Vine St, Kissimmee, FL 34741
Directions (407) 572-8250
GNC
4.1 (93)
Vitamin & supplements store
700 Centerview Blvd Spc #700, Kissimmee, FL 34741
Directions (407) 201-6062

Research & Studies

Impact of the gut microbiota on intestinal immunity mediated by tryptophan metabolism
J Gao, K Xu, H Liu, G Liu, M Bai, C Peng… - Frontiers in cellular and …, 2018 - frontiersin.org
… In addition to serving as a nutrient enhancer, L-tryptophan (… are important for maintaining healthy bowels. Although the high … As an essential nutrient in mammals, L-tryptophan (Trp), and …
20181,497 citations
The biology and biochemistry of kynurenic acid, a potential nutraceutical with multiple biological effects
LF Alves, JB Moore, DB Kell - International Journal of Molecular Sciences, 2024 - mdpi.com
… Accordingly, improved functioning, and the potential for an extended and healthy lifespan, might … (viz L-tryptophan), we consider it worthwhile to review their properties in broad outline. …
202436 citations
Gut microbe-derived trimethylamine shapes circadian rhythms through the host receptor TAAR5
KK Mahen, WJ Massey, D Orabi, AL Brown… - Elife, 2026 - elifesciences.org
Elevated levels of the gut microbe-derived metabolite trimethylamine N-oxide (TMAO) are associated with cardiometabolic disease risk. However, the mechanism(s) linking TMAO …
20261 citations
L-Tryptophan 60 vcaps by Douglas Labs
RNR Points
Supplementing healthy women with up to 5.0 g/d of L-tryptophan has no adverse effects
C Hiratsuka, T Fukuwatari, M Sano, K Saito… - The Journal of …, 2013 - academic.oup.com
… intake of the essential amino acid L-tryptophan (L-Trp) have … Indeed, pellagra remains a public health problem in many … a dietary supplement to improve sleep patterns, mental health, …
201379 citations
DSHEA's failure: Why a proactive approach to dietary supplement regulation is needed to effectively protect consumers
RE Nowak - University of Illinois Law Review, 2010 - papers.ssrn.com
… supplements, such as ephedra, Ltryptophan, and Hydroxycut. Collectively, these dietary supplements … to prevent future health crises like those involving ephedra and L-tryptophan. The …
201038 citations

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Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2017-02-24. DSLD Label ID: 70440. 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.