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.

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.

Serving Size: 1 Vegetarian Capsule(s) · 1 per day

Not Present

• 

  Life Extension L- Tryptophan 500 mg 90 Vegetarian Capsules

  Vitacost.com4.7(505)

  $24.75
• 

  Life Extension Tryptophan Plus Capsules

  Walmart - Life Extension Buyers Club4.7(629)

  $24.00
• 

  Source Naturals L Tryptophan

  Life Extension4.6(1100)

  $16.88
• 

  Life Extension L-tryptophan 500 Mg – Promotes Healthy Sleep & Satiety

  eBay - vitamins-supplements4.7(505)

  $26.95
• 

  Life Extension L Tryptophan 90 Vegan Capsules

  GoSupps.com

  $104.99
• 

  Life Extension Enhanced Stress Relief 30 Capsules

  Life Extension4.6(432)

  $21.00
• 

  TWO PACK Life Extension Optimized Tryptophan Plus 90 caps

  eBay4.7(629)

  $48.00
• 

  NOW Foods L- Tryptophan Relaxation Support Capsules

  Vitacost.com4.6(4100)

  $13.46

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• Bodyfitlu Bascharage

  4.9 (216)

  Health food store

  1-3 Rue de la Continentale, 4917 Bascharage Käerjeng

  Directions26 50 36 30

• Sport Nutrition Messancy

  5.0 (4)

  Vitamin & supplements store

  Rue d'Arlon 220, 6780 Messancy, Belgium

  Directions+32 63 23 54 05

• Fitdoheem Sport & Nutrition

  4.8 (4)

  Vitamin & supplements store

  10 Rue Zénon Bernard, 4030 Esch-sur-Alzette

  Directions691 889 227

• Tonic Food Howald

  4.6 (72)

  Sports nutrition store

  4 Rue des Scillas, 2529 Howald Hesperange

  Directions26 19 64 72

• Suppléments Distribution

  3.8 (18)

  Pharmacy

  Avenue Champion 11, 6790 Aubange, Belgium

  Directions+32 63 22 08 97

• ViviBene Lux Sàrl-s

  5.0 (16)

  Vitamin & supplements store

  5 A Laangert, 8117 Bertrange

  Directions691 143 878

• Le Comptoir de la Santé

  4.8 (148)

  Vitamin & supplements store

  208 Rte d'Arlon, 8010 Strassen

  Directions26 25 83 83

• Boutique Nutrition Sportive - Toutelanutrition.com - Luxembourg

  5.0 (82)

  Vitamin & supplements store

  6 Rue Charles Darwin, 1433 Gasperich Luxembourg

  Directions27 67 59 07

• 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

• Tryptophan: biochemical and health implications

  H Sidransky - 2001 - api.taylorfrancis.com

  … L-tryptophan, an important indispensable amino acid, may act. Overall, it becomes apparent that L-tryptophan … The role of L-tryptophan in health and disease has become apparent from …

  200146 citations

• 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

• Serum metabolic and microbial profiling yields insights into promoting effect of tryptophan‐related metabolites for health longevity in centenarians

  X Qiu, C Mu, J Hu, J Yu, W Tang, Y Liu, Y Huang, Y Lu… - Imeta, 2025 - Wiley Online Library

  … 5-Hydroxy-L-tryptophan, L-Formylkynurenine and L-Tryptophan. 5-… 5-MIAA is a downstream product of L-tryptophan metabolism, … Therefore, the potential of 5-MIAA for life extension was …

  202515 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

• 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

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2025-04-24. DSLD Label ID: 328524. 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.