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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

Out of Stock
  • Expiration Date: 04/2019
  • Shipping Weight:
    0.18 lbs
    Switch to Metric units
  • Product Code: DRB-00110
  • UPC Code: 753950001107
  • Package Quantity: 60 Veggie Caps
  • Dimensions:
    2.1 x 2.1 x 3.7 in, 0.15 lbs
    Switch to Metric 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.

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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.

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Not effective

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

Does not help in pain or in mood betterment

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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!