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

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

Regular price $13.99 USD
Regular price $13.99 USD Sale price $13.99 USD
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Helps support healthy mood*

Helps support endorphin metabolism*

Helps support neurotransmitter function*

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Product Overview


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

Doctor's Best D-phenylalanine is a non-protein amino acid that acts as an inhibiting agent to enzymes that degrade enkephalins, naturally occurring peptides in the body that metabolize endorphins. Endorphins are neurotransmitters that play a key role in the function of the nervous system and are associated with feelings of pleasure. By limiting production of enzymes that break down endorphins, the supplement can help support a healthy mood and normal functioning of the nervous system. 

  • Helps support healthy mood
  • Helps support endorphin metabolism
  • Help support neurotransmitter function

Expiration Date

11/30/2025 00:00:00




Hypromellose (vegetarian capsule), microcrystalline cellulose, magnesium stearate (vegetable source). 

Suggested Use

Take 1 capsule daily on an empty stomach at least 20 minutes before meals, or as recommended by a nutritionally informed physician. To ensure optimal phenylalanine absorption, avoid taking other amino acid supplements within 2-3 hours of intake. 


Phenylalanine supplements should not be taken by children, pregnant, nursing, individual with phenylketonuria (PKU), high blood pressure, taking anti-psychotic medications or MAO inhibitors. Consult your physician before use. 

Store in a cool dry place.

Supplement Facts
Serving Size: 1 Veggie Capsule
Servings Per Container: 60 
 Amount Per Serving% Daily Value
D-Phenylalanine500 mg
†Daily Value not established.