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L-Phenylalanine 500 mg

NOW
4.5
★ ★ ★ ★ ★
(4515 ratings)
Phenylalanine 500 mg
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Score97

A high-quality, 500 mg amino acid supplement that supports the brain's natural chemistry for focus and mood.

How scoring works
Quantity:120 Capsule(s) • (120 servings)
Goals:

Score 97

A high-quality, 500 mg amino acid supplement that supports the brain's natural chemistry for focus and mood.

How scoring works
$6.90($0.05 per serving)
Pure Formulas
$ 11.89
iHerb
$ 12.24
Vitacost
$ 13.09
Daily Vita
$ 11.60
Daily Vita
$ 6.90
Amazon
$ 11.60
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Analysis

L-phenylalanine is an essential amino acid that serves as a building block for dopamine and norepinephrine. This 500 mg dose is often used to support mental alertness and a balanced mood throughout the day.

Because it is provided in a free-form state, it can be absorbed easily without competing with other proteins for transport. It fits well into a routine for someone looking for straightforward brain health support.

Pros

  • Reliable 500 mg dose
  • Free-form for easy absorption
  • Very affordable per serving
  • Simple, single-ingredient formula

Cons

  • Capsule size might be large for some
  • Requires consistent daily use

Warnings

  • Not for individuals with phenylketonuria (PKU)
  • Check with a professional if taking mood-related medications

Nutrient quality

96 Highest impact

Free-form amino acids offer excellent biological availability for metabolic use. The 500 mg dosage aligns well with standard protocols for amino acid repletion.

Ingredient transparency

100 Highest impact

Active ingredients are listed with precise dosages and specific nomenclature. Clear usage instructions assist in safe and effective daily supplementation.

Customer satisfaction

95 Highest impact

Consistently strong ratings across a large volume of feedback suggest high user satisfaction. Most reviews indicate the experience matches the intended cognitive support goals.

Value for money

98 Highest impact

The price per serving is exceptionally low for a high-quality amino acid supplement. Large bottle size and effective dosing provide significant value for the user.

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Ingredients

IngredientAmount per serving
L-Phenylalanine
500 mg
Gluten Free Adults 18–50 Vegan Dairy Free Vegetarian
Report overview
Phenylalanine · 500 mg OverallScore100
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
This is a high-quality, standalone supplement providing a therapeutic dose of L-phenylalanine optimized for absorption. It is an ideal choice for individuals seeking targeted support for dopamine synthesis and cognitive clarity.
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Amino Complex Berry Flavored

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★★★★★
(6102 ratings)
L-phenylalanine is delivered within a balanced blend of essential amino acids, including 1.25 grams of L-leucine. High-purity standards ensure a reliable source of building blocks for individuals focusing on overall structural health.
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93 Value

True Focus

NOW
4.5
★★★★★
(358 ratings)
Combining L-phenylalanine with L-tyrosine and Taurine offers a more complex nutritional profile for cognitive maintenance at a competitive price. Vitamin B6 and C further support the metabolic conversion of amino acids into vital neurotransmitters.
Other sellers (1)
90 Value

Daily Amino Acid

21st Century
4.7
★★★★★
(8679 ratings)
A diverse array of amino acids including L-lysine and L-threonine ensures a balanced intake of building blocks for systemic support. These tablets provide a practical way to maintain general protein requirements alongside targeted phenylalanine intake.
Other sellers (1)
90 Value

Amino Complex Berry Flavored

Thorne
4.5
★★★★★
(6102 ratings)
Thorne utilizes high-quality forms of essential amino acids to support muscle and structural protein synthesis. This formula is particularly suitable for those seeking broad nutritional support with excellent ingredient transparency.
Other sellers (3)
89 Performance

Dopamine Brain Food

NS Natural Stacks
4.5
★★★★★
(441 ratings)
Premium nutrient forms like pyridoxal 5-phosphate and methylcobalamin are paired with L-phenylalanine to support efficient enzymatic pathways. Added folate and trimethylglycine provide specialized support for neurological metabolism and mental drive.
Other sellers (0)
92 Performance

Ciltep

NS Natural Stacks
4.6
★★★★★
(514 ratings)
Artichoke extract and forskolin work together with L-phenylalanine to assist with cognitive clarity and sustained attention. Acetyl-L-carnitine supports mitochondrial function, providing a multi-faceted approach to brain health.
Other sellers (0)
93 Performance

True Focus

NOW
4.5
★★★★★
(358 ratings)
Potassium ascorbate and CoQ10 are included to support antioxidant defenses during periods of high mental demand. The combination of amino acids and botanical extracts provides a comprehensive profile for maintaining cognitive function.
Other sellers (1)
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