L-Tryptophan 500 mg®

Amino Acids & Protein

Brand: Source Naturals

LiquidAmino acid/ProteinOn Market
Click to view full label

Net Contents

100 Gram(s)

Serving Size

0.5 Gram(s)

Servings Per Container

66

Supplement Form

Liquid

Bar Code (UPC/SKU)

0 21078 01999 2

Product Version

SN1999 REV K071

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: Vegetarian, 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
  • Egg
  • 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: 0.5 Gram(s) · 3 per day

IngredientAmount Per Serving
L-Tryptophan1.5 Gram(s)

Not Present

Target Groups

VegetarianAdult (18 - 50 Years)Gluten FreeDairy FreeSugar Free

Label Claims

All OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Suggested use: 1/4 teaspoon three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3/4 teaspoon before bed.

Warnings & Precautions

Precautions re: Pregnant or Nursing or Prescription Medications

Caution: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRI's or MAOI's consult your healthcare professional before using this product.

Precautions re: All Other

Do not use if tamper-evident seal is broken or missing.

Precautions re: Children

Keep out of the reach of children.

Formulation

Formula re: Contains

The essential amino acid L-tryptophan helps support relaxation, restful sleep, and feeling better. It plays, a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response. L-tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L-tryptophan concerts to niacin in the body, which supports circulation, a healthy nervous system, the metabolism of food, and the production of hydrochloric acid for the digestive system. Source Naturals L-tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality.

Formulation re: Vegetarian/Vegan

Suitable for vegetarians and hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

Formulation re: Other

Suitable for vegetarians and hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

Formulation re: Does NOT Contain

Suitable for vegetarians and hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

FDA Statements

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.

FDA Statement of Identity

Dietary Supplement

Other Label Statements

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

Copyright Source Naturals, INC.

Manufacturer & Distributor

Manufacturer

Source Naturals, Inc.

P. O. Box 2118, Santa Cruz, CA, 95062

Market Reference

$9.58 – $124.50· 40 listings
  • Source Naturals L Tryptophan

    Vitacost.com4.6(1100)
    $12.42
  • Source Naturals L-Tryptophan with Coenzyme B-6

    Vitacost.com4.6(297)
    $21.97
  • Source Naturals L-Tryptophan 500mg 30 Cap

    Four Seasons Natural Foods4.6(1100)
    $9.59
  • Source Naturals Serene Science L- Tryptophan 500mg 60 Capsule

    Herbs Direct
    $13.73
  • Best Naturals L- Tryptophan 500 Mg 120 Capsules

    Target
    $26.95
  • NOW Foods L- Tryptophan Relaxation Support Capsules

    Vitacost.com4.6(4100)
    $13.46
  • Nutricost L- Tryptophan Capsules

    Target4.1(231)
    $15.95
  • The Vegan Shoppe L- Tryptophan 500mg 120 Veggie Capsules

    The Vitamin Shoppe4.7(45)
    $36.99

Where to Buy Locally

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Research & Studies

  • Tryptophan As A Nutraceutical–Clinical And A Critical

    MR Suchitra, P Krubaa, S Parthasarathy - European Journal of Molecular & … - academia.edu

    … L Tryptophan is available in the commercial product as 125 mg/ capsule or 500 mg/ capsule … was lowered in preeclamptic compared with the healthy placental arteries, consistent with …

  • Tryptophan As A Nutraceutical–Clinical And A Critical

    MR Suchitra, P Krubaa, S Parthasarathy - European Journal of … - painfreepartha.com

    … L Tryptophan is available in the commercial product as 125 mg/ capsule or 500 mg/ capsule … was lowered in preeclamptic compared with the healthy placental arteries, consistent with …

  • l-Tryptophan

    BMD Knapp, MJ Cupp, TS Tracy - … Supplements: Toxicology and Clinical …, 2003 - Springer

    … ill patients who might be of generally worse health than controls and therefore more likely to use a dietary supplement such as L-tryptophan. Of the patients identified with eosinophil …

    20035 citations
  • 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 produced during food … in the absence of l-tryptophan; ie, the mice must meet the entire need for l-tryptophan from the d-…

    2018402 citations
  • Tryptophan and its role in sleep and mood

    P Yousef, J Rosen, C Shapiro - Studies in Natural Products Chemistry, 2024 - Elsevier

    … It is consumed from different food sources in the form of L-tryptophan. In this chapter, we review the … In the pediatric population, l-tryptophan can be safely and effectively used to manage …

    202420 citations
  • Effectiveness of Silymarin, Sulforaphane, Lycopene, Green Tea, Tryptophan, Glutathione, and Escin on Human Health: A Narrative Review.

    F Sebastiani, C D'Alterio, C Vocca, L Gallelli… - Uro, 2023 - search.ebscohost.com

    … There is an enormous amount of substances and actives of natural origin that are known for their purported health benefits. The aim of this review is to narratively summarize the …

    202310 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2023-09-25. DSLD Label ID: 295957. 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.