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Doctor's Best, D-Phenylalanine, 500 mg, 60 Veggie Caps

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Doctor's Best, D-Phenylalanine, 500 mg, 60 Veggie Caps

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Doctor's Best, D-Phenylalanine, 500 mg, 60 Veggie Caps

In Stock
  • Expiration Date: January 2020
  • Shipping Weight:
    0.08 kg
    Switch to Imperial units
  • Product Code: DRB-00110
  • UPC Code: 753950001107
  • Package Quantity: 60 Veggie Caps
  • Dimensions:
    5.3 x 5.3 x 9.4 cm , 0.07 kg
    Switch to Imperial units
  • This is the D-Phenylalanine form, not DL, or L form.

Product Rank:

Frequently Purchased Together
Product Overview


  • Science-Based Nutrition
  • Helps Support Healthy Mood
  • Dietary Supplement
  • Vegan
  • Non-GMO
  • Gluten Free
  • Soy Free

D-phenylalanine is a non-protein amino acid related to the essential amino acid L-phenylalanine. D- and L-phenylalanine are structural mirror images of each other. A small amount of D-phenylalanine may be converted to L-phenylalanine in the body. D-phenylalanine is reported to inhibit an enzyme that degrades enkephalins, which are naturally occurring substances in the body that belong to the class of compounds known as "endorphins".

  • Helps support healthy mood
  • Helps inhibit the degradation of endorphins
  • Help support neurotransmitter function

Suggested Use

Adult Use: Take 1 capsule daily, without food, or as recommended by a nutritionally-informed physician.

Other Ingredients

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


Caution: Phenylalanine supplements should not be taken by individuals with phenylketonuria (PKU), children, pregnant or lactating women, people with high blood pressure, and anyone taking anti-psychotic medications or MAO inhibitors.

Store in a cool dry place.


While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site. Although items may occasionally ship with alternate packaging, freshness is always guaranteed. We recommend that you read labels, warnings and directions of all products before use and not rely solely on the information provided by iHerb.
Supplement Facts
Serving Size: 1 capsule
Servings Per Container: 60 servings
  Amount per serving % Daily Value
D-phenylalanine 500 mg
† Daily Value not established.
iHerb Customer Reviews

Fast Heartrate

Posted by iHerb Customer on March 30 2018 | Verified Purchase

Just started this supplement as one capsule. I seemed to increase in mood but then got a way too fast heart rate, not good when I take other supplements for anxiety. Will try half dose to see if it helps and then review again.

Thanks for your feedback!

Still Weepy with sad music while taking Doctor's Best d-phenylalanine (DPA)

Posted by Sandra-Reviews on March 27 2018 | Verified Purchase

I got this product based on my reading Dr. Julia Ross, MD book titled THE MOOD CURE, this product (Dr. Best) is NOT the brand she (Julia Ross) recommended (LIDTKE). However, I decided to give the cheaper brand a try first. I have been taking this d-phenylalanine (dpa) for about 7 days and I experienced No side effects, nor any noticeable benefits. DPA is suppose to stop the weepy-ness. I take one cap with B2 and B6, twice a day before a meal in the morning and mid afternoon. I am one of those people who get teary in sad movies even if it is bad acting. Sad music really sets me off. I will finish the bottle to see any improvements later. Anyway, I will add l-tryptophan in a few days to see if my mood shifts. Also, as usual, iherb delivered the correct products on time quickly. Thanks!

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good mood and energy

Posted by GrumpyMcSleepyhead on December 23 2017 | Verified Purchase

Very pleased with these! I take one in the morning, and it's usually enough to keep me cheerful for most of the workday. Just remember not to take them with protein-rich foods.

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No real results except dizziness

Posted by iHerb Customer on November 10 2017 | Verified Purchase

I guess this works or not depending on individual situations. 500 mg is too much for me and resulted in dizziness. I tried the suggestion of another reviewer and took half doses, which relieved some of the dizziness. However, after 2 weeks, I'm experiencing zero results otherwise. I'll keep taking half doses until the bottle is gone just to find out if this stuff works at all once it builds up in the bloodstream. I'm glad this works for others and commend Doctor's Best for making it available.

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Not effective

Posted by iHerb Customer on September 11 2017 | Verified Purchase

Does not help in pain or in mood betterment

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