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

AU$19.25 AU$19.25 (Saved AU$17.40)

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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.

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

WORKS!!!i highly recommend to put the C0'DE: "TA L65 41" for 5 % Any Order!* ( no spa ces)*

Posted by iHerb Customer on January 11 2018 | Verified Purchase

This works just perfect for me! I feel much better with it! I highly recommend putting the c~0 '~d~e "TA L65 41" for 5% AnyOrder!* ( no spa ces)*

Thanks for your feedback!

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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Great Product

Posted by iHerb Customer on April 26 2017 | Verified Purchase

This product is very effective and I highly recommend it for pain management.

Thanks for your feedback!