header_search header_signed-out header_signed-in header_cart sharefilled circlex
Added to Cart
Cart Total:
Customers Also Bought:
24/7 Help

Life Extension, D, L-Phenylalanine, 500 mg, 100 Veggie Caps

$14.06 $14.06 (Saved $4.69)

Thank you!

Your email is being processed.

Life Extension, D, L-Phenylalanine, 500 mg, 100 Veggie Caps

Click to zoom
Shipping Saver ?
Our Price:
You Save:
$4.69 (25)
Quantity Discount:
Buy 3+
(5% off)

Sorry, this product is no longer in stock.

Earn 5% Loyalty Credit ?
Quantity Discount
$13.36 each
(5% off)
Combo Offer: $26.01

Sorry, this product is no longer in stock.

Life Extension, D, L-Phenylalanine, 500 mg, 100 Veggie Caps

In Stock
  • Expiration Date: 07/2019
  • Shipping Weight:
    0.24 lbs
    Switch to Metric units
  • Product Code: LEX-16711
  • UPC Code: 737870167112
  • Package Quantity: 100 Veggie Caps
  • Dimensions:
    2.1 x 2.1 x 3.7 in, 0.2 lbs
    Switch to Metric units
Frequently Purchased Together
Product Overview


  • Foundation for Longer Life
  • Enhances Mood
  • Dietary Supplement

L-phenylalanine is an essential amino acid that can be converted to L-tyrosine in the liver. L-tyrosine can be converted in the brain and in the adrenal glands to dopamine, norepinephrine, and epinephrine (adrenaline) hormones that are depleted by stress, overwork and certain drugs. By replenishing norepinephrine in the brain, mental energy levels are enhanced and a feeling of contentment often occurs. The conversion step from L-tyrosine to norepinephrine may be enhanced if the co-factors (vitamins B6 and C) are included.

Cells in the adrenal medulla synthesize and secrete norepinephrine and epinephrine. Since both norepinephrine and epinephrine can cause smooth muscle (arterial) contraction, care with blood pressure should be taken when supplementing with L-phenylalanine or tyrosine.

D, L-phenylalanine is a 50/50 mixture of its two stereoisomers.

Suggested Use

Read the entire label and follow the directions carefully prior to use.

Take one (1) capsule daily on an empty stomach in the morning, or as recommended by a healthcare practitioner. Best utilized if taken with the co-factors vitamins B6 and C.

Other Ingredients

Vegetable cellulose (capsule), microcrystalline cellulose, vegetable stearate.


Store tightly closed in a cool, dry place.

Caution: May cause anxiety, high blood pressure, and headache. Do not use if you have phenylketonuria. Do not use phenylalanine or tyrosine if you have cancer or muscular dystrophy. Because phenylalanine can elevate blood pressure in hypertensives, consult your healthcare practitioner if you have hypertension. Insomnia may occur from overstimulation if taken too close to bedtime.

  • Keep out of reach of children.
  • Do not exceed recommended dose.
  • Do not purchase if outer seal is broken or damaged.
  • When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.
Supplement Facts
Serving Size: 1 Vegetarian Capsules
  Amount Per Serving %Daily Value
D, L-Phenylalanine 500 mg **
**Daily Value not established.
iHerb Customer Reviews

mood booster

Posted by DrJah24 on Dec 27, 2017 | Verified Purchase

Works good at boosting ones mood.

Thanks for your feedback!

Feeling great

Posted by iHerb Customer on Nov 29, 2017 | Verified Purchase

I started to take DLPE as it's complementary effect was recommended to combine with Naltrexone (MS Medication). However, after a few months, I realised it's side effect of helping depression was effective. I never considered myself depressed, but the unexpected feeling of well being helps everything else!

Thanks for your feedback!

A bit of a lift

Posted by iHerb Customer on Aug 24, 2017 | Verified Purchase

I read about the benefits of this amino acid. And now I experience them. I take a few more than the bottle says but find they help me though the day.

Thanks for your feedback!

Cravings gone!

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

DLPA is fabulous for stopping cravings within 48 hours - sugar, chocolate, pastries, chips and other carbs, alcohol even - anything I usually reach for outside myself for internal comfort! Instead the DLPA helps create natural feel-good endorphins on the inside. Life Extension DLPA is the perfect dose at a great price

Thanks for your feedback!


Posted by iHerb Customer on May 05, 2017 | Verified Purchase

I have been taking this along with SAM-e, 5HTP and GABA for low mood. This combination has definately helped sognificantly but it is hard to say the impact the phenylalanine has had in particular. I recommend reading The Mood Cure to find out more re the use of amino acids for mental wellbeing.

Thanks for your feedback!