Is there a different between phenylalanine and l-phenylalanine? Why does the L have to be in front of phenylalanine?

Yes. There are two forms of phenylalanine: D-Phenylalanine and L-Phenylalanine. They are mirror forms of each other - identical except one is 'left-handed' (L-) the other 'right-handed' (D-). (This is L/D dichotomy is true for all amino acids). D-Phenylalanine is synthetic and generally used more for reducing pain, while L-Phenylalanine is the naturally occurring form that is more readily converted into dopamine and norepinephrine and used to help with mood, energy and focus.

How does this compare to Naltrrxone?

Reading the reference to Naltrexone, one has nothing to do with the other. L-Phenylalanine is a brain food supplement.

How does this compare to gaba?

I use both for different reasons. I use GABA when I need to settle my mind down. I have anxiety and gabba really helps that. I take L- Phenelaline (2-100mg) with a B6 and that specifically helps the fact that I can’t swallow without food getting stuck. I do that in the morning and evening where as GABA you can take when ever and it seems to work within 20 minutes. I find that the GABA-effects work for about 3-4 hours then I may need to take another one (750mg).

Is this product equivalent of Phentermine

We do not have any information on pharmaceuticals. L-Phenylalanine is an essential amino acid that is necessary for the synthesis of proteins. Because L-Phenylalanine can be readily converted into the amino acid tyrosine, which forms part of the structure of the neurotransmittters dopamine and norepinephrine, it is important for the maintenance of a healthy nervous system.

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Now Foods L - Phenylalanine, 120 Caps 500 mg

Now Foods L - Phenylalanine, 120 Caps 500 mg

Product ID: 97392686

Details

Age Range (Description)
Adult
Brand
Now Foods
Diet Type
Gluten Free
Flavour
Unflavoured
Item Form
Capsule
Item Weight
0.1 Kilograms

🌱100% vegetarian & allergen-free

💊500 mg pure L-Phenylalanine per capsule

🔋120 capsules for 4-month supply

$56.51

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Description

💼 Elevate your brainpower with clean, consistent L-Phenylalanine fuel!

LONG LASTING SUPPLY - With 120 capsules per bottle, stay consistently fueled for up to four months without interruption.
PRECISION DOSAGE POWER - Each capsule delivers a potent 500 mg of L-Phenylalanine, supporting optimal nervous system function.
TRUSTED BRAND HERITAGE - Manufactured by NOW Foods in the USA, a leader in quality supplements with over 2,000 positive reviews.
CLEAN CONSCIOUS FORMULA - Free from gluten, dairy, soy, nuts, and eggs—perfect for the mindful, health-savvy professional.
UNFLAVORED EASY TO TAKE - Neutral taste capsules designed for seamless integration into your daily wellness routine.

Now Foods L-Phenylalanine offers a high-quality, 500 mg vegetarian capsule supplement designed to support nervous system health. Packaged in a 120-count bottle, it provides a reliable four-month supply free from common allergens like gluten, dairy, soy, and nuts. Manufactured in the USA by a trusted brand, this unflavored supplement fits seamlessly into a professional's daily wellness regimen.

Specifications

ASIN	B000JCN2MW
Age Range Description	Adult
Allergen Information	Dairy Free, Egg Free, Gluten Free, Nut Free, Soy Free
Best Sellers Rank	#100,726 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #649 in Combination Multivitamins & Minerals
Brand	Now Foods
Container Type	Bottle
Country of Origin	USA
Customer Reviews	4.4 out of 5 stars 2,137 Reviews
Diet Type	Gluten Free
Dosage Form	Capsule
Flavor	Unflavoured
Flavour	Unflavoured
Item Dimensions	6.4 x 6.4 x 11.3 Centimeters
Item Form	Capsule
Item Weight	0.1 Kilograms
Manufacturer	NOW Foods
Manufacturer Part Number	P8251
Material Features	Vegetarian
Model number	0132
Net Quantity	1.00 Count
Number of Items	1
Primary Supplement Type	L - Phenylalanine
Total Servings Per Container	120
UPC	733739001320
Unit Count	1.00 Count
Warranty Description	no warranty available

Reviews

A**R

Good product

Important supplement for the nervous system

29.10.2025

M**E

Never buy

It’s a scam

31.10.2025

な**な

効いているような気がします！

色々口コミを読み購入。飲むと気分が落ち着く気がします。

10.01.2024

W**K

Do not take if you ave G.I. issues

I found most amino acids are hard on people with G.I issues.

9.04.2019

A**R

Increase your IQ! Take morning and night!

I'm way smarter now than I was as a young person! I can't credit the keto diet entirely but I think it is the main factor. Taking this kind of supplement is second. It has repaired my brains and kept me sharp. I take it morning and night! Every single day!!

30.01.2026

E**S

... a little bit of a strange taste but that's fine. Have only been taking them for a few ...

Has a little bit of a strange taste but that's fine. Have only been taking them for a few days so cannot tell if they are working or not

23.02.2017

F**E

１週間ちょっとで届きました。

無事届きました。海外から送料込で１３７５円、効果あるのか！？という半信半疑な気持ちで購入。飲み始めて３日。朝と夕方の２回、１カプセルずつ飲んでみました。効果は。。。。微妙。ですが、飲んだ直後、ちょっと頭がフラフラするような気がします。集中力は、微妙に改善されたようなないような。気のせいなのか！？そんな感じです。劇的に何かがかわるものではありません。今のところ。おなかの調子や体調がわるくなることもないです。今のところ。プラセボ効果（プラシーボ効果）で集中力が得られるなら、それはそれで良し！

7.12.2017

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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