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Doctor's Best, Best L-Tryptophan, 500 mg, 90 Veggie Caps

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In Stock
  • Expiration Date: Jun 2019
  • Shipping Weight: 0.24 lbs
  • Product Code: DRB-00126
  • UPC Code: 753950001268
  • Package Quantity: 90 Veggie Caps
  • Dimensions: 2.4 x 2.4 x 4.3 in, 0.2 lbs
  • Doctor's Best uses exclusively the Tryptopure brand of Tryptophan, manufactured by Ajinomoto of Japan.
Product Overview


  • Science-Based Nutrition
  • Dietary Supplement
  • USP Pharmaceutical Grade
  • Featuring Ajinomoto's TryptoPure
  • Vegan
  • Non-GMO and Gluten Free
  • AjiPure Amino Acids

L-tryptophan is an essential amino acid (protein building block) in human nutrition. Essential amino acids are not synthesized by the body and must be obtained in the diet. The L-tryptophan in this product is manufactured and tested for purity according to the Japanese Pharmacopeia (JP) and the United States Pharmacopeia (USP) standards.

Suggested Use

Adult Use: Take 1 or 2 capsules daily, or as directed by a health practitioner. For optimum absorption, take separately from protein-containing foods and dietary supplements containing protein or amino acids.

Other Ingredients

Modified cellulose (vegetarian capsule), cellulose, magnesium stearate (vegetable source), silicon dioxide.

Contains nothing other than listed ingredients

Supplement Facts
Serving Size: 1 capsule
Servings Per Container: 90 servings
  Amount per serving % Daily Value
Ajinomoto L-Tryptophan 500 mg
† Daily Value not established.
iHerb Customer Reviews


Posted by 4983071545317567837 on Jan 14, 2017

Good product. First time user.

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Supports sleep

Posted by 5594173592208823878 on Jan 10, 2017

Makes you noshes and helps you sleep. Haven't had in long enough to check is there any effects on seratonin production and the mood in general.

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Like night and day

Posted by 5460024890231655683 on Aug 05, 2016

I have used this product for over two years now for chronic fatigue symptoms caused by IBS. A true game changer for me!! I take them with C-vitamin (important!) before bedtime and wake up feeling energized. Awesome product!

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Effective without side effects

Posted by 5473203115191728683 on Jun 09, 2016

Very calming, there are no unpleasant side effects. For now I am very happy although I use it only 3 weeks ...

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Works Very Well

Posted by Reviewer2366867 on Jun 01, 2016

I have tried many different brands of L-Tryptophan over the years but this one has stuck with me. I have several things going on which really inhibit my ability to relax or sleep. I begin taking these an hour or two before actually going to bed. I usually take one and then another about an hour later along with other things - sometimes Valerian (liquid) and sometimes 5htp. Within about fifteen or twenty minutes of going to bed, I can actually fall asleep. Such relief!

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