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Source Naturals, L-Tryptophan, 500 mg, 120 Tablets

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Source Naturals, L-Tryptophan, 500 mg, 120 Tablets

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Source Naturals, L-Tryptophan, 500 mg, 120 Tablets

In Stock
120 Tablets
120 Tablets
60 Tablets
  • Expiration Date: 05/2021
  • Shipping Weight:
    0.3 lbs
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  • Product Code: SNS-01980
  • UPC Code: 021078019800
  • Package Quantity: 120 Tablets
  • Dimensions:
    2.2 x 2.2 x 4 in, 0.25 lbs
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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: 40
  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

Not As Affective as the capsules

Posted by iHerb Customer on Aug 29, 2017 | Verified Purchase

I recommend the capsules over this pill form. I didn't realize I bought the wrong one. It works somewhat...but not near as affective. I'm going to stick it out with these, because I paid for them...can't wait to go back to the capsules!

Thanks for your feedback!

Great for anxiety and depression!

Posted by iHerb Customer on Jul 25, 2017 | Verified Purchase

I've been taking 2 of these a night for almost a year and swear by them for the relief of anxiety and depression. They don't make me feel drowsy or hyperactive, they just gently make me feel better. It can take a week or two for them to take full effect. I haven't noticed any side effects and don't see myself ever stopping them unless I have to. I take them along with 2 x L-Theanine, also from source naturals.

Thanks for your feedback!


Posted by iHerb Customer on Jul 16, 2017 | Verified Purchase

I didn't find this form of Tryptophan effective. It was better when I crushed the pills and dissolved under my tongue (which was pretty bitter!!), but it still wasn't very effective at decreasing sugar cravings or regulating sleep. I was very disappointed because I usually have great success with Source Naturals.

Thanks for your feedback!

Great help natural medication

Posted by iHerb Customer on Jun 15, 2017 | Verified Purchase

I have found this product to help me better than prescription my head is clearer I feel better myself Before taking this medication my head was messed up I was depressed I was angry now taking this medication I'm clear and focused

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Not right for me

Posted by iHerb Customer on May 09, 2017 | Verified Purchase

I am sure this product is a great one however on this occasion it was not the right fit for my needs. I followed the dosage directions and found my symptoms became worse. After the evening dose I encountered stomach cramps and diarrhoea. The next couple of days I adjusted the dose to less but found my sleep was more broken than normal and I had headaches. As such after 4 days adjusting the dosage With no odoriferous results I stopped taking them.

Thanks for your feedback!