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Source Naturals, L-Tryptophan with Coenzyme B-6, 500 mg, 60 Tablets

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In Stock
  • Expiration Date: Feb 2020
  • Shipping Weight: 0.18 lbs (0.08 kg)
  • Product Code: SNS-01987
  • UPC Code: 021078019879
  • Package Quantity: 60 Tablets
  • Dimensions: 1.8 x 1.8 x 3.3 in, 0.15 lbs (0.07 kg)
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Product Overview


  • Dietary Supplement
  • Mood Enhancement and Sleep

The essential amino acid L-tryptophan helps support relaxation, restful sleep, and a positive outlook. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response. This tryptophan includes the activated coenzyme form of vitamin B-6, called P-5-P, that is required to convert tryptophan to serotonin. 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.


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
Vitamin B-6 (from 13 mg of pyridoxal-5'-phosphate [Coenzymated]) 9 mg 450%
Calcium 60 mg 6%
L-Tryptophan 1.5 g
†Daily Value not established.
iHerb Customer Reviews

Helps with sleep and depressions

Posted by Reviewer1972894 on Oct 05, 2016

Take 1 tablet to minimize low moods and 2-3 tablets to help fall asleep. Repeat as necessary. Very grateful for this wonderful product!

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very good product.

Posted by Reviewer2335499 on Aug 02, 2016

It has helped me fall asleep quickly.

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Unexpected results

Posted by 5684444650114378612 on Jul 15, 2016

I took just one the first time I opened my new bottle and didn't notice any difference in my sleep pattern. So, it sat om my nightstand next to my other medications and supplements for a few weeks. Then 2 days ago, I read the back label once, then again, noticing I could be taking them MORE than just at bedtime. So, I began taking one at bedtime and for 2 days in a row I slept through the night. And today I took one in the morning along with my pain med and anxiety med and did a few things and started to feel a difference in my mood. I went to my chiropratic appointment and he was able to do a wonderful manipulation. And I began to really feel good. I plan to give this a chance by taking just the 2 a day and see how I continue doing. Hopefully I can stop taking my anxiety med at some point after speaking with my Primary doctor who I advised ahead of time that I had purchased the L-Tryptophan. Right now I'm ready for my 2nd dose. Quite the unexpected results.

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really works

Posted by 5113275771700385711 on Jun 02, 2016

good and cheap small portions good price

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Posted by 5208514601253008853 on Mar 05, 2016

This seems to do the job as described. I sometimes need a little something for sleep.

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