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 Supplements, L-Phenylalanine 500 mg, Nervous System Support*, Amino Acid, 120 Veg Capsules

Product ID: 255727859

Details

Brand
NOW
Diet type
Gluten Free
Flavour
Unflavored
Item dimensions L x W x H
6.4 x 6.4 x
Item form
Capsule
Item weight
0.1 Kilograms

🌱120 vegan, allergen-free capsules

💊500 mg pure L-Phenylalanine per capsule

🧠Supports dopamine & norepinephrine synthesis

R771

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Description

🧬 Elevate your mind, naturally — because your brain deserves the best!

PURE TRANSPARENT - Non-GMO, soy-free, gluten-free, and free from common allergens for peace of mind.
STRESS MOOD ALLY - Supports nervous system balance to help you stay calm and focused under pressure.
CLEAN VEGAN POWERHOUSE - 120 allergen-free capsules crafted for mindful wellness.
NEURO BOOSTING AMINO ACID - 500 mg of essential L-Phenylalanine fueling your brain’s neurotransmitters.
TRUSTED QUALITY PROVEN RESULTS - NOW brand reliability with 4.4-star rating from over 2,000 health-conscious users.

NOW Supplements L-Phenylalanine delivers 500 mg of a vital amino acid per vegan capsule, essential for protein synthesis and neurotransmitter production. Free from common allergens and GMO ingredients, this supplement supports nervous system health by aiding dopamine and norepinephrine formation. With 120 capsules per bottle, it’s a clean, trusted choice for professionals seeking natural stress relief and cognitive support.

Specifications

ASIN	B000JCN2MW
Age Range Description	Adult
Allergen Information	Dairy Free, Egg Free, Gluten Free, Nut Free, Soy Free
Best Sellers Rank	#36,752 in Health ( See Top 100 in Health ) #622 in Amino Acid Nutritional Supplements
Brand	NOW
Brand Name	NOW
Color	Off White
Container Type	Bottle
Customer Reviews	4.4 out of 5 stars 2,143 Reviews
Diet Type	Gluten Free
Dosage Form	500
Flavor	Unflavored
Flavour	Unflavored
Item Dimensions	6.4 x 6.4 x 11.3 centimeters
Item Form	Capsule
Item Weight	0.1 Kilograms
Item form	Capsule
Item weight	0.1 Kilograms
Manufacturer	NOW Sports - Nutrition and Wellness
Manufacturer Part Number	P8251
Material Features	Vegan
Material Type Free	egg free,gmo free,soy free,wheat free,gluten free
Model Name	upplements, L-Phenylalanine 500 mg, Nervous System Support*, Amino Acid, 120 Veg Capsules
Model Number	0132
Number of Items	1
Primary Supplement Type	multivitamin
Primary supplement type	multivitamin
Product Benefits	Stress Relief
Special Ingredients	Amino Acid
Specific Uses For Product	Laboratory
Total Servings Per Container	120
UPC	733739001320
Unit Count	120 Count
Unit count	120 Count

Reviews

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

M**Y

I've had good results with this product to decrease symptoms with asthma and allergies.

I have always had good results with NOW brands and usually a good price. I've used this product when I would get really ill with asthma and allergies. It pulled me out of serious "colds/flu" many times. Not a cure, but very helpful. I stopped using it for many years as I stopped being so ill, but Juniper allergies has me using it again. I recommend you ask a clinical nutritionist, or other wellness professional for advise in your particular situation as you may not have the same results I have with it. It was recommended in a book, "The Diet Cure." This is a health book about what supplements might help you with different health problems.

7.03.2025

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

Good product

Important supplement for the nervous system

29.10.2025

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

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R771

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

1 month ago

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