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Now Foods, L-Phenylalanine, 500 mg, 120 Veggie Caps

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Now Foods, L-Phenylalanine, 500 mg, 120 Veggie Caps

In Stock
  • Expiration Date: Feb 2020
  • Shipping Weight:
    0.14 kg
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  • Product Code: NOW-00132
  • UPC Code: 733739001320
  • Package Quantity: 120 Veggie Caps
  • Dimensions:
    6.4 x 6.4 x 11.2 cm , 0.11 kg
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Product Overview


  • Nervous System
  • Free-Form
  • Non-GMO
  • A Dietary Supplement
  • Vegetarian - Vegan
  • Amino Acids
  • Family Owned Since 1968
  • GMP Quality Assured

L-Phenylalanine is an essential amino acid that is necessary for the synthesis of protein. Because L-Phenylalanine can be readily converted into the amino acid tyrosine, which forms part of the structure of the neurotransmitters dopamine and norepinephrine, it is important for the maintenance of a healthy nervous system.

Suggested Use

Take 1 capsule 1 to 3 times daily as needed, preferably between meals.

Other Ingredients

Cellulose (capsule).

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.


Settling of powder may occur in the capsule, which is filled by weight without added fillers.

Store in a cool, dry place after opening.

Caution: For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition [e.g. high blood pressure of phenylketonuria (PKU)].

Keep out of reach of children.

Natural color variation may occur in this product.

Supplement Facts
Serving Size: 1 Veg Capsule
  Amount Per Serving %Daily Value
L-Phenylalanine (Free-Form) 500 mg *
*Daily Value Not Established
iHerb Customer Reviews

nervous system support

Posted by getpinepollen on Jul 21, 2017 | Verified Purchase

Personally I think this one is overrated and the claim "nervous system support" a bit bold. It won't do that much one time I had a slight up in motivation that I might got from 5 capsules. I am quite high functioning it might work different for people below baseline. That being said the NOW L-tyrosine is better or a grapefruit with a cup of coffee if your looking for cognitive enhancement.

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Posted by iHerb Customer on Jun 20, 2017 | Verified Purchase


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Can be very useful for brain power

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

Very good nutrient for work or motivation. A lot more safer than other stimulants. My body takes what it needs with amino acids. I take it in the morning, and at 5 pm I take l-Tryptophan for serotonin. I think it is very important to have enough Tryptophan too in the afternoon for mood. Phenylalanine and Tryptophan are a must have!! Fast shipping, good quality, good ingredients. Perfect. Thanks.

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Works well for me

Posted by iHerb Customer on May 31, 2017 | Verified Purchase

I suffer from ME/CFS and I find that phenylalanine helps. Up until now I have been using DL phenylalanine but my osteopath tested me and discovered that I need more L at this point. He tested me with this brand and my test response showed that it would do the trick. I am due for another test in a week and am looking forward to seeing if I need to increase my dose. I ordered this from the UK and it arrived promptly. The price, even with postage, is cheaper than I can get locally.

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Improves my mood

Posted by iHerb Customer on Apr 13, 2017 | Verified Purchase

I'm trying L-Phenylalanine for the first time to help with depression. I started on one capsule per day, taken upon waking, on an empty stomach, 30 minutes before breakfast. I didn't notice any improvement in my mood, so gradually increased the dose. I now take four capsules each morning and the improvement to my mood is obvious. Less than four capsules seems to have no effect on me. I like this particular brand because the capsules contain no fillers or additives, just the active ingredient.

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