VitaSuppTrack

L-Tryptophan 500 mg®

Amino Acids & Protein

Brand: NOW

CapsuleAmino acid/ProteinOn Market

Functions

Sleep, Mood & Stress
Click to view full label

Net Contents

120 Veg Capsule(s)

Serving Size

1–2 Veg Capsule(s)

Servings Per Container

60

Supplement Form

Capsule

Bar Code (UPC/SKU)

7 33739 00167 2

Product Version

CODE 0167 V4

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: Vegan, Vegetarian, 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.

Supplement Facts

Serving Size: 1–2 Veg Capsule(s) · 2–3 per day

IngredientAmount Per Serving
L-Tryptophan1 Gram(s)—

Not Present

Other Ingredients

CelluloseCellulose powderStearic Acid

Target Groups

VeganVegetarianAdult (18 - 50 Years)Gluten FreeDairy Free

Label Claims

All OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Suggested Usage: Take 1-2 capsules 2 to 3 times daily on an empty stomach, with final dose at bedtime, or as directed by your physician.

Warnings & Precautions

Precautions re: All Other

Caution: For adults only.

Precautions re: Pregnant or Nursing or Prescription Medications

Consult physician if pregnant/nursing, taking medication (especially antidepressants such as SSRIs and MAOIs), or have a medical condition.

Precautions re: All Other

May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery.

Precautions re: Children

Keep out of reach of children.

Precautions re: Allergies

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

Precautions re: All Other

Do Not Eat Freshness Packet. Keep in Bottle.

Storage

Storage

Store in a cool, dry place after opening.

Formulation

Formulation re: Does NOT Contain

Every lot of NOW L-Tryptophan is tested to be free of Peak E and microbial contamination.

Formulation re: Vegetarian/Vegan

Vegetarian/Vegan

Formulation re: Does NOT Contain

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.

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

A Dietary Supplement

Other Label Statements

General Statements: All Other Content

L-Tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet. L-Tryptophan is critical for the production of serotonin and melatonin, which help to support a positive mood, healthy sleep patterns, and proper immune system function.*

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

CAPSULE SIZE

General Statements: All Other Content

Supports Relaxation*

General Statements: All Other Content

~ Encourages Positive Mood* ~ Promotes Restful Sleep*

Seals/Symbols

Non-GMO

General Statements: All Other Content

Amino Acids

General Statements: All Other Content

Family owned since 1968.

General Statements: All Other Content

Natural color variation may occur in this product.

General Statements: All Other Content

Please Recycle.

Seals/Symbols

GMP QUALITY ASSURED

General: Product/Version Code

CODE 0167 V4

Manufacturer & Distributor

Manufacturer

NOW Foods

395 S. Glen Ellyn Rd., Bloomingdale, IL, 60108, USA

Market Reference

$3.00 – $115.35· 40 listings

  • Now Foods L- Tryptophan 500mg 90 Veg Capsules

    Natures Food Markets4.8(21)
    $22.49

  • NOW Foods L- Tryptophan Relaxation Support Capsules

    Vitacost.com4.6(4100)
    $13.46

  • Now Foods L-Tryptophan 500 mg

    Walmart - DailyVita4.6(5600)
    $22.41

  • (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

  • NOW Foods L- Tryptophan Double Strength 1000 mg 60 Tablets

    Walmart4.6(1400)
    $18.25

  • (2 pack) NOW Supplements, L-Tryptophan 500 mg, Encourages Positive Mood*, 120 Veg Capsules, Beige

    Walmart - Fruitful Yield4.6(5600)
    $45.32

  • Now L-Tryptophan 500mg 120 Vegetable Capsules

    Locatel Health & Wellness Online Store4.6(4100)
    $17.79

  • NOW L-Tryptophan 500 mg 60 Vegicaps

    vitadvice.com4.5(2)
    $23.55

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.

Research & Studies

  • Oral tryptophan activates duodenal aryl hydrocarbon receptor in healthy subjects: a crossover randomized controlled trial

    GH Rueda, N Causada-Calo… - American Journal …, 2024 - journals.physiology.org

    … ) intake while containing less than 500 mg of l-tryptophan per day. Subjects were provided … l-tryptophan supplementation, which is not surprising as this study was performed in healthy …

    202430 citations

  • The FDA Ban of L-tryptophan: politics, profits and prozac

    DW Manders - Social Policy, 1995 - go.gale.com

    … use of amino acid nutritional supplement L-Tryptophan a few days … serotonin drugs - now among them L-Tryptophan itself - … extensive research on the medical politics of L-Tryptophan. …

    199511 citations

  • l-Tryptophan

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

    … supplements that were commercially available in the United States include Tryptophan PRN 350 mg capsules, L-tryptophan 500 mg … be of generally worse health than controls and …

    20035 citations

  • Effects and side effects associated with the non-nutritional use of tryptophan by humans

    JD Fernstrom - The Journal of nutrition, 2012 - academic.oup.com

    … syndrome,’’ which requires medical attention. The symptoms of … Trp has been studied for these actions for 5 decades now and … Effect of L-tryptophan on brain serotonin metabolism in …

    2012143 citations

  • 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 … the nutritional requirements for L-Trp (300 mg/d in adults) (12) …

    201379 citations

  • A systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning

    AM Kikuchi, A Tanabe, Y Iwahori - Journal of dietary supplements, 2021 - Taylor & Francis

    … and negative mood in healthy adult populations. We have targeted healthy adult men and … Now she works as an academic officer at LLC Okutoeru from 2018. Her research interests …

    2021109 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2016-01-25. DSLD Label ID: 55135. 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.

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