Your Cart is Empty
But it doesn't have to be.
Continue Shopping.
Added to Cart
Cart Total:
Customers Also Bought:

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

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

Earn 5% Loyalty Credit ?
Our Price:
Shipping Saver ?
You Save:
$8.31 (44)

Sorry, this product is no longer in stock.

In Stock
  • Expiration Date: Jan 2020
  • Shipping Weight:
    0.3 lbs
    Switch to Metric units
  • Product Code: NOW-00132
  • UPC Code: 733739001320
  • Package Quantity: 120 Veggie Caps
  • Dimensions:
    2.5 x 2.5 x 4.4 in, 0.25 lbs
    Switch to Metric units
Bundle Offer
Save $2.00 when you purchase these items today for only $12.65
Total: $14.65
Combo Discount: - $2.00
Together: $12.65

Sorry, this product is no longer in stock.

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

Improves my mood

Posted by 5343655630868221025 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.

Was this review helpful to you?

Thanks for your feedback!

Better Than the Rest

Posted by safetytowhere on Mar 18, 2016 | Verified Purchase

Definitely the best brand in terms of potency, though your mileage may vary when it comes to the overall usefulness of phenylalanine as a supplement. It did provide a mood lift for me, but I don't think the recommended 1 capsule dose is likely to make a dent in cases of truly intractable depression and/or ADHD. At least not by itself.

Was this review helpful to you?

Thanks for your feedback!


Posted by 5438795166010625951 on Jul 22, 2015 | Verified Purchase

Reduced my depression and tiredness. New order is placed today.

Was this review helpful to you?

Thanks for your feedback!

using for sleep

Posted by 5761101439668124507 on Jun 19, 2015 | Verified Purchase

Using this AA in conjunction with 3 others plus herbs and magnesium - I have managed to turn around a 35 year habit of type 2 insomnia that has responded to no other forms or combinations od treatments. I'm now sleeping through the night and waking fully rested at least 5 nights out of the week. This is nothing short of miraculous in my experience. All the AA products that I use are the Now Brand and their price combined with effectiveness makes this a product that I am more than happy to recommend to anyone.

Was this review helpful to you?

Thanks for your feedback!


Posted by 5436054419938957068 on Nov 15, 2014 | Verified Purchase

Fantastic !!! This is an entirely new level!

Was this review helpful to you?

Thanks for your feedback!