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L-Phenylalanine 500 mg

NOW
4.5
★ ★ ★ ★ ★
(4578 ratings)
Phenylalanine 500 mg
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Score87
A focused and economical L-phenylalanine capsule with limited source detail and a critical phenylketonuria restriction.
How scoring works
Quantity:120 Capsule(s) • (120 servings)
Goals:

Score 87

A focused and economical L-phenylalanine capsule with limited source detail and a critical phenylketonuria restriction.
How scoring works
$6.90($0.05 per serving)
Pure Formulas
$ 11.89
iHerb
$ 12.24
Vitacost
$ 13.13
Daily Vita
$ 11.60
Daily Vita
$ 6.90
Amazon
$ 11.60
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Analysis

The 500 mg L-phenylalanine capsule offers a straightforward amino-acid serving without competing ingredients. Its active form and amount are easy to assess.

The formula avoids other large neutral amino acids that could compete for transport. No branded source, fermentation method, or purity grade is disclosed.

Excellent value and a large supply make it practical for users who specifically want phenylalanine. It should never be treated as appropriate for people with phenylketonuria.

Who is it for
  • Adults specifically seeking standalone L-phenylalanine
  • Value-focused users without phenylketonuria
Best for
  • Simple amino-acid supplementation
  • Long-supply daily routines

Pros

  • Provides 500 mg of the L-form
  • No competing amino acids
  • Simple single-active formula
  • Excellent value

Cons

  • No branded source
  • Purity and fermentation details are absent
  • Narrow single-pathway formula

Warnings

  • People with phenylketonuria must not use phenylalanine.

Nutrient quality

96 Highest impact

The clearly identified L-form is appropriate for targeted phenylalanine use. The phenylalanine amount is substantial for targeted supplementation.

Ingredient transparency

83 Highest impact

Every listed active has an individual amount and no proprietary blend hides key doses. Daily directions and the complete inactive-ingredient list are not supplied.

Customer satisfaction

69 High impact

The supplied average is favorable and the aggregate pool is large. No specific feedback is provided to assess recurring complaints or whether experience matches the intended use.

Value for money

97 Highest impact

Serving cost is low for the disclosed active amount. The focused design avoids paying for unnecessary active ingredients.

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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 OverallScore94
A+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyA+ Value

The standalone L-form provides a focused and practical phenylalanine option at 500 mg per capsule. Its simple format avoids competition from other large neutral amino acids and offers strong value for the active amount. The supplied information does not show the important phenylketonuria warning, so people with PKU should not use it.

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77 Performance

Ciltep

NS Natural Stacks
<p>Active vitamin B6, a standardized artichoke extract, acetyl-L-carnitine, phenylalanine, and forskolin create a coherent nootropic stack. Compared with the original single amino acid, the added cognitive or essential-amino-acid ingredients broaden potential use, while phenylalanine remains unsuitable for people with phenylketonuria.</p>
77 Performance

Amino Complex Berry Flavored

Thorne
<p>A clearly disclosed essential-amino-acid profile provides useful structural nutrition, though several secondary amino acids are lightly dosed. Compared with the original single amino acid, the added cognitive or essential-amino-acid ingredients broaden potential use, while phenylalanine remains unsuitable for people with phenylketonuria.</p>
74 Performance

True Focus

NOW
<p>A substantial tyrosine dose and supporting phenylalanine, grape-seed extract, DMAE, and ginkgo create a plausible focus formula. Compared with the original single amino acid, the added cognitive or essential-amino-acid ingredients broaden potential use, while phenylalanine remains unsuitable for people with phenylketonuria.</p>
60 Budget

Daily Amino Acid

21st Century
<p>Several L-amino acids use clear forms, but DL-methionine includes an avoidable non-L isomer. No eligible candidate costs less than the original, so this is a functional fallback rather than a truly cheaper option.</p>
66 Budget

Essential Aminos

Pure Encapsulations
<p>The essential amino acids are clearly identified as L-isomers or stable hydrochloride forms. No eligible candidate costs less than the original, so this is a functional fallback rather than a truly cheaper option.</p>
75 Budget

Dopamine Brain Food

NS Natural Stacks
<p>Tyrosine, phenylalanine, trimethylglycine, and active B-vitamin forms create a focused neurotransmitter-support formula with clear doses. No eligible candidate costs less than the original, so this is a functional fallback rather than a truly cheaper option.</p>
72 Value

Neuro Fuel

NS Natural Stacks
<p>Pyridoxal phosphate, standardized artichoke, acetyl-L-carnitine hydrochloride, phenylalanine, and forskolin create a well-specified nootropic stack. The broader active profile may add utility beyond the original, but its higher serving cost limits the value advantage.</p>
60 Value

Daily Amino Acid

21st Century
<p>Several L-amino acids use clear forms, but DL-methionine includes an avoidable non-L isomer. The broader active profile may add utility beyond the original, but its higher serving cost limits the value advantage.</p>
66 Value

Essential Aminos

Pure Encapsulations
<p>The essential amino acids are clearly identified as L-isomers or stable hydrochloride forms. The broader active profile may add utility beyond the original, but its higher serving cost limits the value advantage.</p>
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