L-Tryptophan 500 mg®

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

This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.

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

Not Present

• 

  Protocol For Life Balance L-Tryptophan 500 mg

  Vitacost.com4.7(143)

  $23.00
• 

  L-Tryptophan 500 mg. (60 vegetarian capsules) ~ Protocol for Life

  vitalgoods.com4.7(143)

  $24.20
• 

  L-Tryptophan 500 mg

  Natural Wellness Corner4.7(143)

  $23.00
• 

  NOW Foods L- Tryptophan Relaxation Support Capsules

  Swanson Health Products4.6(4100)

  $15.49
• 

  Protocol for Life Balance Clinical Stress Relief 60 Capsules

  Supplement First4.8(32)

  $33.00
• 

  Protocol For Life Balance 5-HTP 100mg 90 Capsules

  Vitacost.com4.8(83)

  $30.00
• 

  Protocol For Life Balance L-Carnitine 500 mg 60 Capsules

  iHerb4.8(91)

  $27.00
• 

  365 by Whole Foods Market L- Tryptophan 60 Veggie Capsules

  Whole Foods Market

  $18.49

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• SupplementRelief

  5.0 (27)

  Vitamin & supplements store

  9618 Jefferson Hwy Suite D-191, Baton Rouge, LA 70809

  Directions(888) 424-0032

• The Vitamin Shoppe

  4.4 (142)

  Vitamin & supplements store

  7601 Andrea Dr, Baton Rouge, LA 70809

  Directions(225) 292-5927

• GNC

  4.3 (50)

  Vitamin & supplements store

  6725 Siegen Ln SPACE V, Baton Rouge, LA 70809

  Directions(225) 364-3305

• Radiant Health of Baton Rouge

  5.0 (8)

  Vitamin & supplements store

  7809 Jefferson Hwy Ste b-6, Baton Rouge, LA 70809

  Directions(225) 930-0658

• Totally Loaded Nutrition

  4.5 (26)

  Health food store

  4415 S Sherwood Forest Blvd, Baton Rouge, LA 70816

  Directions(225) 250-5377

• ANGIOGENESIS LABS

  5.0 (21)

  Vitamin & supplements store

  8032 Summa Ave STE D, Baton Rouge, LA 70809

  Directions(225) 936-1027

• Lucy's Health Foods

  4.7 (32)

  Health food store

  9880 Bluebonnet Blvd, Baton Rouge, LA 70810

  Directions(225) 767-8222

• GNC

  4.1 (66)

  Vitamin & supplements store

  9634 Airline Hwy Ste F6, Baton Rouge, LA 70815

  Directions(225) 237-3030

• 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

  … with l-tryptophan supplementation, which is not surprising as this study was performed in healthy … l-Tryptophan supplementation did not affect cytokine production by PBMC with placebo, …

  202430 citations

• Serotonin, Kynurenine, and Indole Pathways of Tryptophan Metabolism in Humans in Health and Disease

  M Holeček - Nutrients, 2026 - mdpi.com

  … Many bacteria, including the genera Escherichia, Clostridium, and Bacteroides, hydrolyze TRP by tryptophanase (L-tryptophan indole-lyase) to indole, which exerts beneficial effects on …

  202613 citations

• L-Tryptophan: Basic Metabolic Functions, Behavioral Research and Therapeutic Indications

  DM Richard, MA Dawes, CW Mathias… - International …, 2009 - journals.sagepub.com

  … general healthy nutrition. While typical intake for many individuals is approximately 900 to 1000 mg daily, the recommended daily allowance for adults is estimated to be between 250 …

  2009981 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

  … This systematic review includes 11 RCTs that examined the effects of TRP intake on positive and negative mood in healthy adult populations. We have targeted healthy adult men and …

  2021109 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

• 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 …

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2025-08-22. DSLD Label ID: 337792. 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.