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

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

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

In Stock
  • Expiration Date: 06/2021
  • Shipping Weight:
    0.18 lbs
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  • Product Code: SNS-01987
  • UPC Code: 021078019879
  • Package Quantity: 60 Tablets
  • Dimensions:
    1.8 x 1.8 x 3.3 in, 0.15 lbs
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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 me get to sleep!

Posted by iHerb Customer on Aug 24, 2017 | Verified Purchase

amazing product for helping me to fall asleep and stay asleep

Thanks for your feedback!

I love this stuff!

Posted by iHerb Customer on Aug 02, 2017 | Verified Purchase

I love using Tryptophan. I was looking for something that would help me get a deeper more restful sleep at night after 5 years of sleep deprivation following the arrival of my 3 sons. I was having trouble going to sleep and waking easily through the night. I was feeling quite irritable, out of balance and I have anxiety with OCD traits. My Dr Advised that it may be depression and to journal my symptoms and consider future use of medication. I didn't want to turn to medication right away. I found out about Tryptophan and I liked the idea of how it helps boost the bodies ability to produce melatonin and serotonin in its natural form. So I started on 500mg at bedtime with 500mg of GABA. On the plus side i woke feeling great, well rested and clear thinking, more energy, positivity and no irritability. I actually felt like I really slept and I know I did because I was dreaming big time, I usually don't dream or rarely remember them. On the minus side by noon i was starting to slow down, feeling an afternoon slump and I had bad dreams with one night waking with heart palpitations. I was experiencing horrible nightmares for 3 nights straight so I decided to stop for a day. The irritability returned following a poor night of sleep. I decided to take 250 mg with 500 mg of GABA at bedtime and that seemed to work for me. I'm about 150 lbs and 5'4" so maybe I don't need a high dose. I feel great on it and couldn't imagine going a night without it.

Thanks for your feedback!

stomach problems

Posted by iHerb Customer on Jun 17, 2017 | Verified Purchase

i really liked capsules, they helped me a lot, but these tablets with b6 irritates my sensitive stomach :(

Thanks for your feedback!

Brilliant Product

Posted by iHerb Customer on Apr 06, 2017 | Verified Purchase

This product has a terrifically positive effect on my mental well-being. I recommend it to enhance the effect of SSRIs or on its own for helping bring about a feeling of happiness & well-being.

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helps with sleep and mood

Posted by iHerb Customer on Mar 22, 2017 | Verified Purchase

I usually take melatonin for sleep issues but found especially in the winter that I am very glum and pessimistic probably due to reduced sun exposure. Tryptophan is great at converting to melatonin or seratonin depending on the body's need. I have been taking this for about two weeks and sleep is great and mood is much much better overall. I take one at night. I found that it takes about 2 hours before I feel ready to sleep. No grogginess. Could continue to stay awake if I decided to. I like that it doesn't feel like a drug effect. Very mild but effective.

Thanks for your feedback!