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Source Naturals L-Tryptophan 500mg, 120 Capsules

4.3 out of 5 stars 690 customer reviews
| 23 answered questions
About the product
  • Essential amino acid that helps support mood, relaxation, and restful sleep
  • Plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response
  • Supports immune functions, as the body's precursor to the kynurenines that regulate immunity
  • Extremely pure and regularly tested to ensure the highest standards of quality
  • Promotes drowsiness and good quality sleep in cases of mild insomnia and tryptophan

Frequently bought together

  • Source Naturals L-Tryptophan 500mg, 120 Capsules
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Total price: $32.30
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Product description

Package Quantity:1  |  Size:120 Capsules

Dietary supplement. Mood, relaxation, sleep. The essential amino acid L-Tryptophan helps support relaxation, restful sleep, and feeling better. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response. L-Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L-Tryptophan converts to niacin in the body, which supports circulation, a healthy nervous system, the metabolism of food, and the production of hydrochloric acid for the digestive system. Source Naturals L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.) Hypoallergenic: Contains no yeast, dairy, egg, starch, salt, preservatives, or artificial color, flavor or fragrance.


Product details

Package Quantity: 1 | Size: 120 Capsules
  • Item Weight: 4.3 ounces
  • Shipping Weight: 5.6 ounces (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B000GFSVS2
  • UPC: 021078019855
  • Item model number: SN1985
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (690 customer reviews)
  • Amazon Best Sellers Rank: #1,730 in Health & Personal Care (See Top 100 in Health & Personal Care)
  • If you are a seller for this product, would you like to suggest updates through seller support?


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Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

on June 30, 2015
Package Quantity: 1|Size: 120 Capsules|Verified Purchase
22 comments| 85 people found this helpful. Was this review helpful to you?YesNoReport abuse
on January 30, 2014
Package Quantity: 1|Size: 120 Capsules|Verified Purchase
1313 comments| 212 people found this helpful. Was this review helpful to you?YesNoReport abuse
on February 29, 2016
Package Quantity: 1|Size: 120 Capsules|Verified Purchase
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55 comments| 31 people found this helpful. Was this review helpful to you?YesNoReport abuse
on July 28, 2016
Package Quantity: 1|Size: 120 Capsules|Verified Purchase
22 comments| 26 people found this helpful. Was this review helpful to you?YesNoReport abuse
on August 11, 2016
Package Quantity: 1|Size: 120 Capsules|Verified Purchase
0Comment| 17 people found this helpful. Was this review helpful to you?YesNoReport abuse

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Disclaimer: While we work to ensure that product information is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our Web site. We recommend that you do not solely rely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Amazon.com assumes no liability for inaccuracies or misstatements about products.