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.

Serving Size: 2–4 Capsule(s) · 1 per day

Not Present

• 

  Sigma-Aldrich ʟ-Tryptophan CAS 73-22-3

  Sigma-Aldrich

  $34.40
• 

  L-Tryptophan Pure Encapsulations

  Supplement First4.6(42)

  $124.50
• 

  Research Products International Corp L-Tryptophan, 25 Grams

  Fisher Scientific

  $84.53
• 

  L- Tryptophan Powder

  Vitacost.com4.5(158)

  $22.03
• 

  Metabolic Maintenance L- Tryptophan 500mg 60 Capsules

  Allergy Research Group4.7(47)

  $40.00
• 

  L- Tryptophan

  Stallop Formulas

  $37.79
• 

  Lidtke Technologies L- Tryptophan Chewable 30 Caps

  Lidtke Technologies4.6(15)

  $15.95
• 

  L- Tryptophan Supplement Powder

  Walmart - BulkSupplements.com4.9(119)

  $28.97

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.

• Willner Chemists

  4.7 (146)

  Vitamin & supplements store

  100 Park Ave, New York, NY 10017

  Directions(800) 633-1106

• Uscriptives

  4.4 (42)

  Vitamin & supplements store

  1535 W Loop S Ste 200, Houston, TX 77027

  Directions(800) 778-7191

• Supplement Superstore

  5.0 (1389)

  Vitamin & supplements store

  8420 Eager Rd, St. Louis, MO 63144

  Directions(314) 961-3935

• NutraBio Labs Inc

  4.9 (173)

  Vitamin & supplements store

  600 Lincoln Blvd, Middlesex, NJ 08846

  Directions(888) 688-7224

• Village Green Apothecary

  4.8 (490)

  Vitamin & supplements store

  5415 W Cedar Ln, Bethesda, MD 20814

  Directions(301) 530-0800

• NutraLeaf

  4.7 (10)

  Vitamin & supplements store

  1780 La Costa Meadows Dr, San Marcos, CA 92078

  Directions(858) 705-1940

• SameDaySupplements.com

  4.5 (503)

  Vitamin & supplements store

  64 Nancy St Unit c, West Babylon, NY 11704

  Directions(631) 539-7339

• Rx Anabolics Steroids Center

  5.0 (323)

  Vitamin & supplements store

  4 Cleveland Park, East Freetown, MA 02717

  Directions(530) 332-8063

• Detection of impurities in dietary supplements containing l-tryptophan

  S Karakawa, A Nakayama, N Ohtsuka, K Sato… - Amino Acids, 2022 - Springer

  … study was to evaluate the purity of nine globally available dietary supplement brands containing l-tryptophan … that are beyond the scope of this study (Fernstrom 2012). The US National …

  202211 citations

• The metabolism of o-and L-tryptophan and D-and L-kynurenine by liver and kidney preparations.

  M Mason, CP Berg - 1952 - cabidigitallibrary.org

  … L-tryptophan to kynurenine in appreciable quantities. Anthranilic acid was formed from L-tryptophan and L-kynurenine, and the L-tryptophan … in vitamin B 6 contained, per cent., vitamin-…

  1952149 citations

• Time-Dependent Effects of L-Tryptophan Administration on Urinary Excretion of L-Tryptophan Metabolites

  C HIRATSUkA, M Sano, T FUkUWATARI… - Journal of Nutritional …, 2014 - jstage.jst.go.jp

  … ’s nutritional status (25), particularly a surplus of the vitamin. … and vitamin B6 to determine whether any of our subjects were vitamin B2- or vitamin B6-deficient at the time of this study. …

  201418 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

  … We found that L-Trp loading did not result in deficiencies in riboflavin and vitamin B-6, … The average intakes of riboflavin and vitamin B-6 by our participants were 1.2 and 0.8–0.9 …

  201379 citations

• L-tryptophan as fluorescent probe for determination of folic acid in some pharmaceutical products

  TF Tahir, AF Qader, MI Salih… - Aro-The Scientific …, 2019 - bp.koyauniversity.org

  … of L-Tryptophan. The concentration of FA was proportional to the quenched fluorescence intensity of L-Tryptophan … Vitamins are crucial for the growth and normal development of living …

  201910 citations

• Analysis, nutrition, and health benefits of tryptophan

  M Friedman - International Journal of Tryptophan Research, 2018 - journals.sagepub.com

  … Here, tryptophan refers to l-tryptophan and the isomeric form … to the vitamin niacin (nicotinamide) showed that the availability of d-tryptophan was almost the same as that of l-tryptophan …

  2018402 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2014-06-25. DSLD Label ID: 34051. 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.