L-Tryptophan

Suggested Use

DIRECTIONS: One to two (1-2) capsules daily on an empty stomach at bed time; or as directed by a healthcare professional.

• 

  Metabolic Maintenance L- Tryptophan 500mg 60 Capsules

  Supplement First4.7(46)

  $40.00
• 

  Horbaach L Tryptophan 1500mg 180 Capsules

  Walmart - Carlyle Nutritionals, LLC4.8(30)

  $19.69
• 

  Nutricost L- Tryptophan Capsules

  Target4.6(1600)

  $15.95
• 

  Life Extension Tryptophan Plus Capsules

  Walmart - Life Extension Buyers Club4.6(626)

  $24.00
• 

  NOW Foods L- Tryptophan Double Strength 1000 mg 60 Tablets

  iHerb4.6(1400)

  $19.94
• 

  Best Naturals L-Tryptophan mg 60

  Target4.7(74)

  $9.99
• 

  Amazing Formulas L- Tryptophan 1000 mg 120 Tablets

  Wellnessbetter.com4.7(315)

  $17.77
• 

  L-Tryptophan Complete Lidtke

  Lidtke Technologies4.8(19)

  $27.95

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.

• The Vitamin Shoppe

  4.3 (183)

  Vitamin & supplements store

  12 4th Ave, Brooklyn, NY 11217

  Directions(718) 858-8314

• Promix Nutrition

  4.8 (362)

  Vitamin & supplements store

  182 Mulberry St # Store, New York, NY 10012

  Directions(352) 221-9320

• Village Supplements

  5.0 (8)

  Vitamin & supplements store

  261 E 10th St, New York, NY 10009

  Directions

• GNC

  4.0 (225)

  Vitamin & supplements store

  134-136 Fulton St, New York, NY 10038

  Directions(212) 374-9473

• GNC

  4.4 (88)

  Vitamin & supplements store

  753 Broadway Spc 753, New York, NY 10003

  Directions(212) 380-5999

• Nootropic Nation, LLC

  5.0 (1)

  Vitamin & supplements store

  176 Mulberry St APT 5, New York, NY 10013

  Directions(855) 313-2943

• The Vitamin Shoppe

  3.9 (84)

  Vitamin & supplements store

  32 Court St, Brooklyn, NY 11201

  Directions(718) 596-0466

• The Vitamin Shoppe

  4.4 (98)

  Vitamin & supplements store

  257 8th Ave, New York, NY 10011

  Directions(212) 243-0086

• Tryptophan dietary impacts gut barrier and metabolic diseases

  S Taleb - Frontiers in immunology, 2019 - frontiersin.org

  … health, L Tryptophan (Trp) is one of the nine essential amino acids supplied by diet, whose metabolism … ) expressed by the host affects Trp metabolism by gut microbiota to generate …

  2019277 citations

• Tryptophan in nutrition and health

  B Poeggeler, SK Singh, MA Pappolla - International journal of molecular …, 2022 - mdpi.com

  … human health and lifespan. Amino acids are the building blocks of life that enable repair as well … containing this molecular metabolism’s modifiers can improve health. Research into the …

  202222 citations

• Tryptophan metabolism in animals: important roles in nutrition and health

  K Yao, J Fang, YL Yin, ZM Feng, ZR Tang… - Front Biosci (Schol …, 2011 - researchgate.net

  … L-Tryptophan is a nutritionally essential amino acid for monogastric animals and preweaning ruminants because it cannot be synthesized in the body. Besides serving as a building …

  2011201 citations

• Dietary patterns and tryptophan metabolism: mechanistic insights and health implications

  CA Buhurcu, MG Karadağ - British Journal of Nutrition, 2026 - cambridge.org

  … Animal-derived proteins, particularly from meat, are rich in Ltryptophan, which can be metabolised by the gut microbiota in the cecum and colon to form skatole and indole via enzymes …

  20262 citations

• Kynurenic acid, a key L-tryptophan-derived metabolite, protects the heart from an ischemic damage

  E Bigelman, M Pasmanik-Chor, B Dassa, M Itkin… - PLoS …, 2023 - journals.plos.org

  … in the L-tryptophan (TRP) metabolism pathway in general and a significant induction in kynurenic acid (kynurenate, KYNA), one of the major products of the TRP metabolism both in the …

  202310 citations

• Effects of combined intraduodenal administration of lauric acid and l-tryptophan on postprandial plasma glucose, glucoregulatory hormones and gastric emptying in …

  J Anjom-Shoae, PCE Fitzgerald, BD Rose, V Bitarafan… - Diabetologia, 2026 - Springer

  … In healthy men, lauric acid (C12) and l-tryptophan (Trp), when administered intraduodenally in loads of 1.26 and 0.42 kJ/min (0.3 and 0.1 kcal/min), respectively, that are individually …

  2026

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2013-08-23. DSLD Label ID: 24920. 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.