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Source Naturals, L-Tryptophan, 500 mg, 60 Tablets

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Source Naturals, L-Tryptophan, 500 mg, 60 Tablets

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Source Naturals, L-Tryptophan, 500 mg, 60 Tablets

In Stock
60 Tablets
120 Tablets
60 Tablets
  • Expiration Date: May 2021
  • Shipping Weight:
    0.18 lbs
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  • Product Code: SNS-01979
  • UPC Code: 021078019794
  • Package Quantity: 60 Tablets
  • Dimensions:
    1.8 x 1.8 x 3.4 in, 0.15 lbs
    Switch to Metric units

Product Rank:

#384 in Amino Acids >
Frequently Purchased Together
Product Overview


  • Dietary Supplement
  • Mood, Relaxation, Sleep
  • Non GMO Validated

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.

Suggested Use

1 tablet three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 tablets before bed.

Other Ingredients

Dibasic calcium phosphate, stearic acid, modified cellulose gum, and silica.

Suitable for vegetarians and Hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.


Caution: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs consult your health care professional before using this product.

Store in a cool, dry place.

Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

Supplement Facts
Serving Size: 3 Tablets
Servings Per Container: 20
  Amount Per Serving %DV
Calcium 52 mg 5%
Iron (naturally occurring) 570 mcg 3%
L-Tryptophan 1.5 g
†Daily Value not established.
iHerb Customer Reviews

Great Calm Down To Sleep!

Posted by iHerb Customer on January 26 2018 | Verified Purchase

I just joined iherb to reorder this. I tried gaba calm which really had minimal effect for me. This however I could definitely feel a calm down drowsy effect to get me off to sleep when mind was racing. I still had vivid hectic dreams as I have my entire life but skeot nearly 8 hours. I'm yet to try during the day....that was only on one tablet at night when they say three. So thumbs up so far to feel an effect that helps.

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Replaces anti depressants

Posted by iHerb Customer on January 16 2018 | Verified Purchase

This is the best and most natural product I have found to relieve mild depressions and help with sleep. No side effects!

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Posted by iHerb Customer on December 3 2017 | Verified Purchase


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Helps fall asleep

Posted by iHerb Customer on August 28 2017 | Verified Purchase

Have been taking and it helps me fall asleep but have still been waking up at 3am panicking so I need something else to add to it.

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still undecided

Posted by iHerb Customer on May 7 2017 | Verified Purchase

im happy with product as results seem positive

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