Added to Cart
Cart Total:
Customers Also Bought:
24/7 Help

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

$18.21 $18.21 (Saved $15.78)

Thank you!

Your email is being processed.

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

Shipping Saver ?
Our Price:
You Save:
$15.78 (46)
  • Quantity Discount
  • Buy 3+
    Save 10%

Sorry, this product is no longer in stock.

Earn 5% Loyalty Credit ?

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

In Stock
  • Expiration Date: 05/2020
  • Shipping Weight:
    0.24 lbs
    Switch to Metric units
  • 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.
Combo Offer!
Save $2.00 when you purchase these items today for only $23.21
Together: $23.21

Sorry, this product is no longer in stock.

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

No effect

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

I take 2 capsules in the morning, and 2 in the evening. I tried taking it for 4 months, but I experiened no effect whatsoever. Nothing, nada.

Thanks for your feedback!

Not as helpful as I would have liked

Posted by iHerb Customer on Oct 05, 2017 | Verified Purchase

I have serious sleep issues, only relieved through the use of conventional sleep meds. The problem with them is that the longer you take them, the more you need to keep upping the dose as they become less effective and the more you become completely dependent on them. Therefore I began to look for something that would resolve this issue but wouldn't cause dependence. Among others, I discovered L-tryptophan, an ingredient in one of the other supplements I was trying and decided to try it on its own, hoping it would be more effective than what I was taking. i've been taking it now for several weeks and my experience has been, that it helps me to sleep longer hours; instead of getting up at 3:30, 4 am, i get up at 5:30, 6, and although I haven't been able to get off my sleep meds completely, I have been able to reduce the dose. The trick is finding the right dose and how to administer it; at this point, I'm taking 6; 2 each time, several times over the course of the evening. In summary, I feel that although they have allowed me to sleep longer hours, I have not yet been able to eliminate the need for conventional sleep meds which is my goal.

Thanks for your feedback!

Product Thoughts

Posted by iHerb Customer on Apr 30, 2017 | Verified Purchase

Works Great

Thanks for your feedback!

Ce produit est très bien.

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

Je prends ce produit depuis trois ans et j'en suis très contente

Thanks for your feedback!

Excelent, effective

Posted by iHerb Customer on Mar 04, 2017 | Verified Purchase

I take this for OCD and anxiety, it works very well and doesn't make me as sleepy as 5-HTP. Because it has to be converted to 5-HTP by the body, the onset is about 2 to 3 hours from taking it, preferably on an empty stomach. When it kicks in, you notice a mild relaxing effect that peaks for about 1-2 hours and then fades away within 8 hours aprox.. I recommend taking it with L-Theanine for a more accentuated relaxing effect. Don't take too much, just 1 pill in the evening/night or 1 pill in the morning and 1 in the night.

Thanks for your feedback!