Source Naturals   DL-Phenylalanine 750 mg - 30 Tablets

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6 Reviews

"DL-Phenylalanine by Source Naturals made me want to sleep all day long - I am sc..."  Read all reviews

Item Number: SN1569
Serving Size: 1 Tablet Servings per Container: 30
Price per Serving:  $0.23 Price per Unit*: $0.23 per Tablet
* Price Per Unit may reflect product's price per capsule, tablet, ounce, fluid ounce, etc.
14 In Stock. This item will ship today if ordered within 14 hr 11 min
Regular Price:  $10.75 $6.95
days. Never run out.
- +

DL-Phenylalanine‚ or DLPA‚ is a 50/50 mixture of the D- and L- forms of the amino acid phenylalanine (phenylalanine is one of the few aminos that can be utilized in its D- form). Researchers believe that D-phenylalanine (DPA) inhibits the action of an enzyme that breaks down endorphins and enkephalins. These are proteins that bind to opioid receptor sites in the brain‚ thereby influencing the perception of minor discomfort that is associated with normal physiological processes. By obstructing the action of this enzyme‚ DPA may extend the life of endorphins and enkephalins and their positive influence on comfort levels. L-Phenylalanine is the precursor to two neurotransmitters that help support an alert state.

These statements have not been evaluated by the Food and Drug Administration (FDA). These products are not meant to diagnose‚ treat or cure any disease or medical condition. Please consult your doctor before starting any exercise or nutritional supplement program or before using these or any product during pregnancy or if you have a serious medical condition.

  • MFG # SN0164
  • UPC # 021078001645
Official Website:

Serving Size: 1 Tablet

Amount Per Serving / % DV

Calcium 54mg / 5%
DL-Phenylalanine 750mg / *

*Daily Value not established.

Other Ingredients:
Dibasic calcium phosphate‚ sorbitol‚ stearic acid‚ magnesium stearate‚ colloidal silicon dioxide‚ and modified cellulose gum.

1 to 3 tablets daily.

Contains phenylalanine. Not to be used by phenylketonurics‚ women who are pregnant‚ may become pregnant‚ or breastfeeding‚ or with antidepressant drugs containing MAO or SSR inhibitors. If you have chronic high blood pressure‚ take after meals and/or consult your health care professional.
Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

  • Made in the USA

Ratings and Reviews

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  • 4.3
4 6
  • 6 Reviews
    • Works as needed

      from Indiana on 4/28/2021
      This manufacturer and dosage works better for me.
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Large tablets

      from CINCINNATI OH on 10/06/2019
      Good DLPA, just large and a little hard to swallow.


      750 mg


      review-checkI would recommend this item to a friend.
    • Hallelujah, this stuff works!

      from TN on 7/07/2017
      I had hot flashes like you would not believe for years and years. I had them during the day, at night, anywhere, anytime even in very cold weather. Finally I realized it was probably not low estrogen related, but something was wrong with my thyroid that regulates body temperature. I did some research and DLPA (DL-Phenylalanine) 750 mg by Source Naturals along with another enzyme, Zinc, Copper, Selenium and vitamins A,C,D, & E are the nutrients that aid the thyroid, the combination completely stopped my hot flashes, I mean stopped them. I am now out of the DLPA and cannot find it in stock on any other site. Please get it back, so I can keep my cool!!


      It works 


      That is too expensive and out of stock!!
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Not sure

      from brooklyn on 10/02/2014
      DL-Phenylalanine by Source Naturals made me want to sleep all day long - I am sceptical about its effect on alertness.



      Not sure - I don't have whole week to test it to give it a chance - I have to stay focus - and they do the opposite.
    • Verified Buyer

      Nice product

      from North Las Vegas, NV on 2/23/2013
      I bought DL-Phenylalanine to add with Montiffs Pure Ltyrosine. Nice product. Inexpensive and fast shipping.
      review-checkI would recommend this item to a friend.
    • Verified Buyer

      Seems to work well

      from Minnesota on 12/04/2012
      Havent taken this brand very long but it seems to work well and is very reasonable.



      review-checkI would recommend this item to a friend.

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If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use. Your healthcare professional is the best source for guidance before beginning an exercise or nutritional supplement program.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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