Home/ Supplements/ Tryptophan/ L-Tryptophan 500 mg

L-Tryptophan 500 mg

product on market Liquid Source Naturals Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • Limited research evidence available for ingredients
B Label Compliance Grade
Label

Product Label

Label for L-Tryptophan 500 mg
Open Full PDF View on NIH DSLD →
Details

Label Data

0.5 Gram(s)
Serving Size
66
Servings
Amino acid/Protein
Product Type
0%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

1.5 Gram(s)
Market median: 500.0mg (70 products)
Claims

Label Claims — Verification

Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

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

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.

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

Keep out of the reach of children.

Formulation Notes

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.

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.

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.

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.

Metadata

Product Details

UPC / SKU0 21078 01999 2
DSLD Entry Date2023-09-25
Product TypeAmino acid/Protein
FormLiquid
DSLD ID295957
Data Updated2026-04-11
Research

Research Evidence

29
Research Sources
48
Avg Quality
19
Rct
5
Meta Analysis
3
Systematic Review
2
Clinical Trial
B Prebiotic and probiotic supplementation and the tryptophan-kynurenine pathway: A systematic review and meta analysis
Meta Analysis Neuroscience and biobehavioral reviews 2021 PubMed DOI
B Tryptophan and 5-hydroxytryptophan for depression
Systematic Review The Cochrane database of systematic reviews 2001 PubMed
B Tryptophan and 5-hydroxytryptophan for depression
Systematic Review The Cochrane database of systematic reviews 2002 PubMed
B The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression
Meta Analysis Nutrition reviews 2022 PubMed DOI
B No effects of acute tryptophan depletion on anxiety or mood in weight-recovered female patients with anorexia nervosa
Rct European archives of psychiatry and clinical neuroscience 2023 PubMed DOI
C The association between tryptophan levels and postpartum mood disorders: a systematic review and meta-analysis
Meta Analysis BMC psychiatry 2022 PubMed DOI
C A systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning
Systematic Review Journal of dietary supplements 2021 PubMed DOI
C Comparison between Acupuncture and Nutraceutical Treatment with Migratens® in Patients with Fibromyalgia Syndrome: A Prospective Randomized Clinical Trial.
Rct Nutrients PubMed DOI
C Intake of Lactiplantibacillus plantarum HEAL9 Improves Cognition in Moderately Stressed Subjects: A Randomized Controlled Study.
Rct Nutrients PubMed DOI
C Are tryptophan and 5-hydroxytryptophan effective treatments for depression? A meta-analysis
Meta Analysis The Australian and New Zealand journal of psychiatry 2002 PubMed
View all evidence for Tryptophan →

This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.