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


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

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

In Stock
  • Expiration Date: 04/2019
  • Shipping Weight:
    0.08 kg
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  • 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.

Frequently Purchased Together
    Product Overview


    • Science-Based Nutrition
    • Dietary Supplement
    • Suitable for Vegetarians

    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".

    • Aids in the relief of minor pain

    Suggested Use

    Adult Use: Take 1 or 2 capsules daily, between meals.

    Other Ingredients

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

    Contains nothing other than listed ingredients


    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.

    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 Jan 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 Dec 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.

    Thanks for your feedback!

    No real results except dizziness

    Posted by iHerb Customer on Nov 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.

    Thanks for your feedback!

    Not effective

    Posted by iHerb Customer on Sep 11, 2017 | Verified Purchase

    Does not help in pain or in mood betterment

    Thanks for your feedback!

    Great Product

    Posted by iHerb Customer on Apr 26, 2017 | Verified Purchase

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

    Thanks for your feedback!