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

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

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

In Stock
  • Expiration Date: 08/2020
  • Shipping Weight:
    0.24 lbs
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  • 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
    Switch to Metric units
  • Doctor's Best uses exclusively the Tryptopure brand of Tryptophan, manufactured by Ajinomoto of Japan.
Frequently Purchased Together
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 iHerb Customer on Mar 01, 2018 | Verified Purchase

best supplement ive used for sleep and you dont wake up feeling groggy. The anti depressant effects starting working within a week and wow it feels very similar to being on an SSRI without any side effects absolutely amazing. will keep continuing to buy this product.

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Amazing sleep aid

Posted by iHerb Customer on Feb 27, 2018 | Verified Purchase

I've been using this for years. I get a natural sleep and feel refreshed after I wake up. I highly recommend.

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Great for Sleep

Posted by iHerb Customer on Feb 13, 2018 | Verified Purchase

Added 1 500mg capsule and 1 P5P B6, 50mg tab to my sleep regime and now my wake ups for the bathroom , with these additions get right back to sleep.

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It really works!

Posted by iHerb Customer on Feb 04, 2018 | Verified Purchase

With this supply you will definitely improve your sleep quality. For me it was enough to get positive results just after a week. I feel myself very well even after 6 hours of sleep. I recommend!

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makes me too wired

Posted by Suppster on Feb 02, 2018 | Verified Purchase

This is probably good for those that are not as sensitive as I am, some might call me a fast oxidizer, but I have a tendency to get wired easily and have multiple allergies, so this wasnt good, made me over-stimulated/wired (so really not good before bed :D)

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