L-Tryptophan®

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: 2 Vegetarian Capsule(s) · 1 per day

Not Present

• 

  L-TRYPTOPHAN by Douglas Labs

  Cincinnati Health Institute4.3(7)

  $54.50
• 

  Douglas Laboratories L- Tryptophan 60 Capsules

  Target4.3(7)

  $58.99
• 

  Douglas Laboratories - L-Tryptophan

  Pure Prescriptions4.3(7)

  $54.50
• 

  L-Tryptophan Pure Encapsulations

  drguberman.com4.6(42)

  $72.50
• 

  Nutricost L- Tryptophan Capsules

  Target4.1(231)

  $15.95
• 

  L- Tryptophan

  SFI Health

  $43.99
• 

  Nootropics Depot L- Tryptophan Capsules

  Nootropics Depot5.0(1)

  $29.99
• 

  Lidtke Technologies L- Tryptophan Chewable 30 Caps

  Lidtke Technologies4.6(15)

  $15.95

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.

• Fitness Store

  4.9 (1479)

  Vitamin & supplements store

  Leof. Eth. Antistaseos 180, Iraklio 713 07, Greece

  Directions+30 281 024 5257

• Proteon

  5.0 (217)

  Vitamin & supplements store

  Leof. Ikarou 60, Iraklio 713 07, Greece

  Directions

• FITONE - Your Nutrition Expert

  4.6 (319)

  Vitamin & supplements store

  Lenorman 184, Athina 104 44, Greece

  Directions+30 21 1008 0877

• proteinmarket.gr/

  5.0 (86)

  Vitamin & supplements store

  Par. Leof. Vouliagmenis 41, Glifada 166 75, Greece

  Directions+30 21 0964 1660

• +boost Malta

  4.8 (109)

  Vitamin & supplements store

  Boost, Sqaq il-Għoġla, Birkirkara BKR 9038, Malta

  Directions+356 2149 9929

• The Protein House

  4.7 (85)

  Vitamin & supplements store

  Leof. El. Venizelou 71, Kallithea 176 71, Greece

  Directions+30 21 3041 1750

• Fitnesstrip

  5.0 (37)

  Vitamin & supplements store

  Paraskevopoulou 44, Peristeri 121 32, Greece

  Directions+30 21 0571 6612

• Protein Planet

  4.6 (132)

  Vitamin & supplements store

  Iras 3, Nikea 184 51, Greece

  Directions+30 21 3042 2254

• Dietary supplements aimed at enhancing performance: efficacy and safety considerations.

  TJ Maher - The Role of Protein and Amino Acids in Sustaining …, 1999 - books.google.com

  … that resulted from the use of Ltryptophan, the US Food and … , healthy individual would benefit nutritionally in any way from … DOUGLAS WILMORE [off microphone]: We have examined …

  19991 citations

• Impact of the gut microbiota on intestinal immunity mediated by tryptophan metabolism

  J Gao, K Xu, H Liu, G Liu, M Bai, C Peng… - Frontiers in cellular and …, 2018 - frontiersin.org

  … In addition to serving as a nutrient enhancer, L-tryptophan (… are important for maintaining healthy bowels. Although the high … As an essential nutrient in mammals, L-tryptophan (Trp), and …

  20181,513 citations

• The biology and biochemistry of kynurenic acid, a potential nutraceutical with multiple biological effects

  LF Alves, JB Moore, DB Kell - International Journal of Molecular Sciences, 2024 - mdpi.com

  … Accordingly, improved functioning, and the potential for an extended and healthy lifespan, might … (viz L-tryptophan), we consider it worthwhile to review their properties in broad outline. …

  202439 citations

• A heretofore undisclosed crux of eosinophilia-myalgia syndrome: compromised histamine degradation

  MJ Smith, RH Garrett - Inflammation Research, 2005 - Springer

  … L-tryptophan is the sole or major component [39]; a preceding “sharp upturn” [40] in nationwide consumption of L-tryptophan supplements … at peak excretions in healthy humans [179];24 …

  200543 citations

• Post-Traumatic Stress Disorder (PTSD) & Anxiety

  L McNamara - drladdvip.com

  … (2) The amino acid 5-HTP (hydroxy-L-tryptophan) has been … supplement, as well as what is in the liver health supplement I … , can all be purchased from Douglas Labs by first creating a …

• Chronic Fatigue Syndrome Nutritional Supplementation Helps Reduce the Symptoms & Progression of Chronic Fatigue Syndrome

  LR McNamara - drladdvip.com

  … disclaimer after the article, and consult your personal health care provider prior to acting … -L-Carnitine and DHEA from Douglas Labs. You can buy from Douglas Labs by first creating a …

• Riboflavin (Vitamin B2) on the Label

  What riboflavin is, how much a typical product provides, and why it can change the color of urine.

  VitaSuppTrack Editorial· Jun 24, 2026

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2012-02-23. DSLD Label ID: 5345. 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.