Source Naturals L-Tryptophan

Roll over image to magnify & Click to Zoom
Images may vary from actual product

Why Set & Save?

  • Lock in the guaranteed lowest prices
  • Schedule delivery according to YOUR needs
  • Surprise gifts & more
  • Never run out of your favorite items
  • Change or cancel at any time

Just click "Add to Set & Save" when placing items in your cart.

Enjoy our low price guarantee and never run out with Set & Save.

Source Naturals L-Tryptophan -- 500 mg - 120 Capsules


Size: 120 Capsules

Shop these comparable items and save!(click here).

You Save: 58%

Retail price: $42.75

Vitacost price: $17.59

In stock
Deliver 1 Time Only
Add to Set & Save

Added to My List as a guest*.

to save this list to your account.

*Your guest list will be temporarily saved until you end this browser session.

1 item added to your list

Source Naturals L-Tryptophan -- 500 mg - 120 Capsules

Oops! Something went wrong and we were unable to process your request. Please try again.


Supplement Facts
Serving Size: 3 Capsules
Servings per Container: 40
Amount Per Serving% Daily Value
Iron (naturally occuring)575 mcg3%
L-Tryptophan1.5 g*
*Daily value not established.
Other Ingredients: Gelatin (capsule), microcrystalline cellulose, dibasic calcium phosphate, colloidal silicon dioxide, and magnesium stearate.
If you are pregnant, breastfeeding, may become pregnant, or are taking medications such as SSRI's or MAOI's, consult your health care professional before using this product.

Source Naturals L-Tryptophan Description

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-TRYPOTOPHAN is extremely pure and is regularly tested to ensure the highest standards of quality.


1 capsule 3 times daily, between means and preferably with fruit juice. To support restful sleep, take 3 capsules before bed.
Free Of
Yeast, dairy, egg, gluten, corn, soy, wheat, sugar, starch, salt, preservatives, artificial color, flavor and fragrance.
These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.
Source Naturals L-Tryptophan -- 500 mg - 120 Capsules 4.8 5 9 18
recommended I started taking L-Tryptophan and glutamine before bedtime. I seem to sleep more 'efficiently' ( sleep approximately the same amount of time as before) but wake up with more energy that before I took them. September 10, 2014
Dosage Accuracy Have tried many different brands of tryptophan, others are weak. Source Naturals (500 mg. caps) and Now (1000 mg. tablets) are reliable in regard to dose. October 19, 2013
Works great I used tryptophan years ago. Then they took it off the market. I am so glad it is back. I have tried lots of other products for sleep and this one works for me. I am an insomniac and this is a safe way to quickly fall asleep. No hangover feeling the next day. I trust this brand. It is gluten free and that is essential for me. June 15, 2013
Good sleep aid I use 2 capsules at night before bed. great to help relaxing. April 18, 2013
Great Benefits Both my husband and my daughter use this product as a sleep aide and are very happy with the results. March 26, 2013
Know someone who would love this product? Don’t keep it a secret – share it now!
Note: Your friend's email address is used for this one-time notification only. We will not collect or store or share it with any other parties.
Friend's Name:
Your Name:
Friend's Email:
Your Email:
Message to your friend: (optional, max 500 characters)
Change the CAPTCHA codeSpeak the CAPTCHA code
Enter the code exactly as shown: 
Frequently Bought Together:
Source Naturals L-Tryptophan
Vitacost Mega EFA® Omega-3 EPA & DHA Fish Oil

Retail price together: $64.74

Vitacost price: $39.58

You Save: 38%

Enter Shipping Zip Code:
Please enter a valid zip code