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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

By Doctor's Best

34 Reviews
In Stock
  • 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 (0.07 kg)
  • Important Note:

    This is the D-Phenylalanine form, not DL, or L form.

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Save $1.00 when you purchase these items today for only $20.65

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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.

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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

5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Helps anxiety, depression and pain
Some people have a deficiency of serotonin which causes depression and anxiety, but having an endorphin deficiency can also cause depression and anxiety. This helped restore my endorphin levels to normal, which helped my depression a bit but also helped my anxiety HUGELY, in fact this is about the most effective thing I have found for my anxiety. I have an arm injury which left me with long-term mild pain, it did help with this too, though the pain came back after I stopped taking D-Phenylalanine, I might not have taken it for long enough.
Aug 25, 2010
Useful for emotional sensitivity and emotionally difficult times
I would have given this 5 stars, except for the fact that at 500mg it gives me this slight but annoying pressure headache and made it a little difficult to focus my eyes. At 250mg, it works best for me when I am going through an emotionally difficult time (DPA increases endorphins in your brain). It makes me much more emotionally at ease and much less bothered by whatever it is that is bothering me. I could see this as very useful for someone to take when they go through a relationship break-up or lose someone close to them. Just make sure you find the minimal dose that works for you. I open the capsule and pour half out then put the capsule back together and swallow it. I take it on an empty stomach and it works best that way. I also read that most studies have found DPA to be effective if taken every day at 100-200mg. So it seems kind of overkill to have these in 500mg capsules, although I'm sure for some people it is fine at that level. I first read about this in Dr. Priscilla Slagle's "The Way Up From Down" and then in Julia Ross's "The Mood Cure". They are both amazing books if you have depression and want a natural program that works even better than prescription medications. I have been following Slagle's basic program for two weeks now and haven't felt this good in years. Sorry for the rant.
Dec 08, 2013

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