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) · 2–3 per day

Not Present

• 

  NOW Foods L- Tryptophan Relaxation Support Capsules

  Vitacost.com4.6(4100)

  $13.46
• 

  Now Foods L- Tryptophan 500mg 90 Veg Capsules

  Natures Food Markets4.8(21)

  $22.49
• 

  Now Foods L-Tryptophan 500 mg

  Walmart - DailyVita4.6(5600)

  $22.41
• 

  (2 pack) NOW Supplements, L-Tryptophan 500 mg, Encourages Positive Mood*, Supports Relaxation*, 60 Veg Capsules, Size: 4.35, Other

  Walmart - Fruitful Yield4.6(5600)

  $29.72
• 

  NOW Foods L- Tryptophan Double Strength 1000 mg 60 Tablets

  Walmart4.6(1400)

  $18.25
• 

  (2 pack) NOW Supplements, L-Tryptophan 500 mg, Encourages Positive Mood*, 120 Veg Capsules, Beige

  Walmart - Fruitful Yield4.6(5600)

  $45.32
• 

  Now L-Tryptophan 500mg 120 Vegetable Capsules

  Locatel Health & Wellness Online Store4.6(4100)

  $17.79
• 

  NOW L-Tryptophan 500 mg 60 Vegicaps

  vitadvice.com4.5(2)

  $23.55

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• GNC

  3.8 (21)

  Vitamin & supplements store

  1540 Bonita Lakes Cir, Meridian, MS 39301

  Directions(601) 693-9204

• Sparzz

  5.0 (1)

  Vitamin & supplements store

  1120 E Main St, Philadelphia, MS 39350

  Directions(800) 781-7715

• The Vitamin Shoppe

  4.1 (120)

  Vitamin & supplements store

  1220 E Northside Dr #400, Jackson, MS 39211

  Directions(601) 362-1781

• Healthway Nutrition Center

  4.8 (41)

  Health food store

  398 US-51, Ridgeland, MS 39157

  Directions(601) 856-8394

• Vitamins Plus

  4.5 (73)

  Health food store

  427 Weathersby Rd, Hattiesburg, MS 39402

  Directions(601) 261-3009

• 5 Star Nutrition Hattiesburg

  4.9 (108)

  Vitamin & supplements store

  3002 Hardy St Unit 150, Hattiesburg, MS 39401

  Directions(601) 336-8455

• GNC

  4.1 (25)

  Vitamin & supplements store

  910 Sawmill Rd, Laurel, MS 39440

  Directions(601) 425-5931

• GNC

  4.4 (14)

  Vitamin & supplements store

  211 N Lewis Ave #70, Philadelphia, MS 39350

  Directions(601) 656-7816

• 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

• The FDA Ban of L-tryptophan: politics, profits and prozac

  DW Manders - Social Policy, 1995 - go.gale.com

  … use of amino acid nutritional supplement L-Tryptophan a few days … serotonin drugs - now among them L-Tryptophan itself - … extensive research on the medical politics of L-Tryptophan. …

  199511 citations

• l-Tryptophan

  BMD Knapp, MJ Cupp, TS Tracy - … Supplements: Toxicology and Clinical …, 2003 - Springer

  … supplements that were commercially available in the United States include Tryptophan PRN 350 mg capsules, L-tryptophan 500 mg … be of generally worse health than controls and …

  20035 citations

• Effects and side effects associated with the non-nutritional use of tryptophan by humans

  JD Fernstrom - The Journal of nutrition, 2012 - academic.oup.com

  … syndrome,’’ which requires medical attention. The symptoms of … Trp has been studied for these actions for 5 decades now and … Effect of L-tryptophan on brain serotonin metabolism in …

  2012143 citations

• Intraduodenal calcium enhances the effects of L-tryptophan to stimulate gut hormone secretion and suppress energy intake in healthy males: a randomized, crossover …

  J Anjom-Shoae, PCE Fitzgerald, M Horowitz… - The American journal of …, 2024 - Elsevier

  Background In humans, intraduodenal infusion of L-tryptophan (Trp) increases plasma concentrations of gastrointestinal hormones and stimulates pyloric pressures, both key …

  202411 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

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2016-01-25. DSLD Label ID: 55134. 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.