L-Tryptophan 500 mg

Suggested Use

Suggested Use: 1 tablet three times daily; between meals and preferably with fruit juice. To support restful sleep; take 3 tablets before bed.

• 

  Source Naturals L-Tryptophan with Coenzyme B-6

  Vitacost.com4.6(287)

  $20.55
• 

  L-Tryptophan Source Naturals

  iHerb4.6(1100)

  $21.81
• 

  Source Naturals Serene Science L- Tryptophan 120 Capsule

  Herbs Direct4.6(1100)

  $24.46
• 

  Source Naturals L-Tryptophan 500mg

  PointBlank Nutrition4.6(1100)

  $19.99
• 

  Best Naturals L-Tryptophan mg 60

  Walmart - Best Naturals4.4(61)

  $12.99
• 

  Nutricost L- Tryptophan Capsules

  Target4.6(1600)

  $15.95
• 

  Swanson L- Tryptophan 500mg 60 Caps

  Target4.8(2700)

  $13.69
• 

  Source Naturals L Tyrosine

  iHerb4.8(558)

  $11.75

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.

• GNC

  4.1 (134)

  Vitamin & supplements store

  494 Gateway Dr, Brooklyn, NY 11239

  Directions(718) 277-0979

• The Vitamin Shoppe

  4.4 (122)

  Vitamin & supplements store

  8929 Avenue D C1, Brooklyn, NY 11236

  Directions(718) 629-2076

• GNC

  4.5 (53)

  Vitamin & supplements store

  2155 A Ralph Ave, Brooklyn, NY 11234

  Directions(347) 875-4578

• The Vitamin Shoppe

  4.3 (183)

  Vitamin & supplements store

  12 4th Ave, Brooklyn, NY 11217

  Directions(718) 858-8314

• GNC

  4.0 (92)

  Vitamin & supplements store

  133-40 79th St, Queens, NY 11414

  Directions(718) 296-4107

• The Vitamin Shoppe

  4.3 (142)

  Vitamin & supplements store

  1326 Kings Hwy, Brooklyn, NY 11229

  Directions(718) 382-2535

• GNC

  4.2 (118)

  Vitamin & supplements store

  56-18 Myrtle Ave, Ridgewood, NY 11385

  Directions(718) 417-7316

• The Vitamin Shoppe

  4.3 (205)

  Vitamin & supplements store

  107-60 Queens Blvd, Forest Hills, NY 11375

  Directions(718) 520-8147

• 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 …

• 5-Hydroxytryptophan (5-HTP): Natural occurrence, analysis, biosynthesis, biotechnology, physiology and toxicology

  ME Maffei - International journal of molecular sciences, 2020 - mdpi.com

  … L-tryptophan [68], TPH was un-competitively inhibited by tetrahydropapaverine with the substrate L-tryptophan… to be competitive with the substrate L-tryptophan and non-competitive with …

  2020320 citations

• L-Tryptophan: Sources and Benefits

  L Does, TMY Sleepy - qualialife.com

  … that L-tryptophan has niacin equivalent activity in the body (ie, we can make NAD + molecules from it). L-tryptophan … not be considered medical advice. Please speak with an appropriate …

• 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

• Regulatory Disparities and Consumer Misperception in Cross-Border Dietary Supplements

  SI Park, HJ Park - Food Supplements and Biomaterials for Health, 2026 - e-fsbh.org

  2026

• 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, …

  202428 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2023-03-22. DSLD Label ID: 273570. 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.