L-Tryptophan®

Other Combinations

Brand: Source Naturals

CapsuleOther CombinationsOn Market

Functions

Sleep, Mood & Stress

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

Net Contents

30 Capsule(s)

Serving Size

1–3 Capsule(s)

Servings Per Container

Supplement Form

Capsule

Bar Code (UPC/SKU)

0 21078 01983 1

Product Version

SN1983 REV J162

Label Analysis

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

2Active Ingredients

2 distinct active ingredients are disclosed in Supplement Facts.

100%Amount Transparency

Every active ingredient discloses a specific amount per serving.

1% Daily Value Coverage

1 ingredients report an established %DV per serving.

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: 1–3 Capsule(s) · 1–3 per day

Ingredient	Amount Per Serving	% Daily Value
Iron	575 mcg	3%
L-Tryptophan	1.5 Gram(s)	—

Not Present

Other Ingredients

GelatinSilicaMagnesium StearateDibasic Calcium PhosphateMicrocrystalline Cellulose

Target Groups

Adult (18 - 50 Years)

Label Claims

All OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Suggested Use: 1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 capsules before bed.

Warnings & Precautions

Precautions re: All Other

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

Precautions re: Children

Keep out of the reach of children.

Precautions re: Pregnant or Nursing or Prescription Medications

Caution: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs consult your health care professional before using this product.

Storage

Store in a cool, dry place.

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

Mood, relaxation, sleep 500 mg

General Statements: All Other Content

The essential amino acid L-tryptophan helps support relaxation, restful sleep, and positive mood. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response and sleep/wake cycles. L-Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L-Tryptophan converts 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.

General: Product/Version Code

SN1983 REV J162

Manufacturer & Distributor

Distributor

Source Naturals, Inc.

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

Market Reference

$9.79 – $124.50· 40 listings

L-Tryptophan Source Naturals
iHerb4.6(1100)
$21.81
Source Naturals L-Tryptophan with Coenzyme B-6
Vitacost.com4.6(287)
$20.55
Source Naturals Serene Science L- Tryptophan 120 Capsule
Herbs Direct4.6(1100)
$24.46
Source Naturals L- Tryptophan with Coenzyme B-6
Herbs Direct4.8(72)
$14.68
Best Naturals L-Tryptophan mg 60
Target4.7(74)
$9.99
Source Naturals L-Tryptophan 500mg
PointBlank Nutrition4.6(1100)
$19.99
Nutricost L- Tryptophan Capsules
Target4.6(1600)
$15.95
Horbaach L Tryptophan 1500mg 180 Capsules
Walmart - Carlyle Nutritionals, LLC4.8(30)
$19.69

Where to Buy Locally

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Showing representative supplement & health retailers — search above for stores in your area.

Vida Nueva Naturel Tienda Naturista (Originales).
5.0 (12)
Vitamin & supplements store
1702 Montana Ave, El Paso, TX 79902
Directions (915) 532-1944
Omnilife Productos - Seytu Cosmetica
5.0 (3)
Vitamin & supplements store
1401 Montana Ave # D, El Paso, TX 79902
Directions (915) 407-3940
The Vitamin Shoppe
4.5 (92)
Vitamin & supplements store
8889 Gtwy Blvd E, El Paso, TX 79925
Directions (915) 599-8587
GNC
4.3 (70)
Vitamin & supplements store
6101 Gateway Blvd W Ste A - 1, El Paso, TX 79925
Directions (915) 778-8858
Supplement Xpress
4.8 (199)
Vitamin & supplements store
965 Resler Dr Suite#108, El Paso, TX 79912
Directions (915) 256-8525
X Nutrition Center
4.7 (34)
Vitamin & supplements store
6974 Gtwy Blvd E Ste D, El Paso, TX 79915
Directions (915) 778-8233
Natural Vitamins & Herbs
4.5 (6)
Vitamin & supplements store
6130 Montana Ave #107, El Paso, TX 79925
Directions (915) 258-1490
The Vitamin Shoppe
4.2 (67)
Vitamin & supplements store
655 Sunland Park Dr J2, El Paso, TX 79912
Directions (915) 584-4995

Research & Studies

L-tryptophan and its deriviates in edible mushroom species.
B Muszyńska, P Komendacki, K Kała… - Medicina Internacia …, 2014 - psjd.icm.edu.pl
… So far informations about non–hallucinogenic indole compounds found in Basidiomycota species relate mostly to L–tryptophan which is the biogenetic precursor of all indole …
201414 citations
Effect of different tryptophan sources on amino acids availability to the brain and mood in healthy volunteers
CR Markus, C Firk, C Gerhardt, J Kloek… - …, 2008 - Springer
… the sources. Whereas this notion is substantiated by the results from the natural TRP sources, … hydrolysate (HPROT) and intake of pure l-tryptophan. Moreover, only HPROT was able to …
2008126 citations
L-Tryptophan: Sources and Benefits
L Does, TMY Sleepy - qualialife.com
… that L-tryptophan has niacin equivalent activity in the body (ie, we can make NAD + molecules from it). L-tryptophan … not be considered medical advice. Please speak with an appropriate …
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-…
2018398 citations
Dietary L-Tryptophan Modulates the Hematological Immune and Antibacterial Ability of the Chinese Mitten Crab, Eriocheir sinensis, Under Cheliped Autotomy Stress
C Zhang, Q Zhang, X Song, Y Pang, Y Song… - Frontiers in …, 2018 - frontiersin.org
… , as ALP and ACP levels reflect the health status of aquatic animals (23, 46). In the present study, we observed that dietary supplementation with 0.70% L-trp significantly increased the …
201825 citations
Problems with over-the-counter 5-hydroxy-L-tryptophan
BL Williamson, K Klarskov, AJ Tomlinson, GJ Gleich… - Nature Medicine, 1998 - nature.com
… the $11.75 billion per year natural medicine and dietary supplement industry, as noted … ulated by passage of the 1994 Dietary Supplement and Health Education Act; hence, their …
199821 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2017-05-24. DSLD Label ID: 73847. 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.