Brand: Douglas Laboratories

CapsuleOff Market
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Net Contents

60 Vegetarian Capsules

Serving Size

2 Vegetarian Capsule(s)

Servings Per Container

Not specified

Supplement Form

Capsule

Bar Code (UPC/SKU)

3 10539 03414 9

Product Version

Not specified

Suggested Use

Suggested Usage: As a dietary supplement; adults take 2 capsules daily or as directed by your healthcare professional.

Market Reference

$9.99 – $395.00· 40 listings
  • Douglas Laboratories L- Tryptophan 60 Capsules

    Cincinnati Health Institute4.7(6)
    $54.50
  • L-Tryptophan

    DrHagmeyer.com4.7(6)
    $43.34
  • Horbaach L Tryptophan 1500mg 180 Capsules

    Target4.8(30)
    $21.49
  • L-tryptophan Supplement Nighttime Formula

    Walmart - VitaPulse5.0(1)
    $17.95
  • L- Tryptophan

    SFI Health
    $43.99
  • The Vegan Shoppe L- Tryptophan 500mg 120 Veggie Capsules

    iHerb4.7(50)
    $36.99
  • L-Tryptophan High 2fl oz

    Covenant Health Products4.8(11)
    $25.00
  • DL- Tryptophan Highly Pure

    Molecular Depot
    $395.00

Where to Buy Locally

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.

  • ONE STOP NUTRITION

    5.0 (136)

    Vitamin & supplements store

    3025 N Dysart Rd #101, Avondale, AZ 85392

  • GNC

    4.1 (58)

    Vitamin & supplements store

    2025 Pebble Creek Pkwy A03, Goodyear, AZ 85395

  • The Vitamin Shoppe

    4.4 (140)

    Vitamin & supplements store

    10020 W McDowell Rd #101, Avondale, AZ 85392

  • Vitamin Shoppe Distribution Center

    4.2 (41)

    Warehouse

    925 N 127th Ave, Avondale, AZ 85323

  • Sanctuary Oils LLC

    4.5 (17)

    Vitamin & supplements store

    303 W Van Buren St #105a, Avondale, AZ 85323

  • Amway Distributor- Health & wellness Shop

    Health and beauty shop

    15585 W Meade Ln, Goodyear, AZ 85338

  • Discount Nutrition Superstore

    5.0 (1091)

    Vitamin & supplements store

    16772 W Bell Rd Ste 107, Surprise, AZ 85374

  • Power Nutrition - Vitamins & Sports Supplements

    4.6 (33)

    Vitamin & supplements store

    5052 W Olive Ave, Glendale, AZ 85302

Research & Studies

  • 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 …

    20181,497 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. …

    202436 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 …

  • L-Tryptophan 60 vcaps by Douglas Labs

    RNR Points

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2013-07-25. DSLD Label ID: 10599. 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.