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Best Naturals L-Phenylalanine 500 mg supplement bottle
Best Naturals

L-Phenylalanine 500 mg Review

What We Researched
1 active ingredient analyzed · 7 inactive ingredients decoded · 1 brand certification checked · Page generated: Sep 2026
100
Product Score Excellent
74
Brand Score Fair

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Phenylalanine 500 mg †
Bioavailability Excellent

Absorption Rating

  • L-Phenylalanine Good
Other Ingredients Excellent

Fillers & Additives

  • Dicalcium Phosphate
  • Microcrystalline Cellulose
  • Croscarmellose Sodium
  • Stearic Acid
  • Magnesium Stearate
  • Silicon Dioxide
  • Pharmaceutical Glaze
Efficacy Excellent

Dosage Analysis

  • L-Phenylalanine 500 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Phenylalanine 500 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Dicalcium Phosphate Safe

Serves as both a filler and a supplemental source of calcium and phosphorus.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Pharmaceutical Glaze Generally_safe

It is used to coat tablets or capsules for easier swallowing or controlled release.

Brand Trust Report
Best Naturals

Founded 2012 · Piscataway, New Jersey, USA · 129 products · shopbestnaturals.com

Certifications

1 certification
Consumerlab Source available Primary evidence

Transparency

4 claims
Third Party Testing Claim — Claimed Evidence available Evidence
In House Testing — Verified Evidence available Evidence
Contains Proprietary Blend — True Brand claim; evidence unavailable

Violation History

2 incidents
Prop 65 Lead and lead compounds2021-12-29 Source available Primary source
Lawsuit Falsely advertising krill oil supplements that allegedly contain no krill.2021 Source available Primary source
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Frequently Asked Questions
Is Best Naturals L-Phenylalanine 500 mg a good supplement?

Best Naturals L-Phenylalanine 500 mg received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients with 180 servings per container. All 7 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Best Naturals, holds a brand trust score of 74/100.

What are the ingredients in Best Naturals L-Phenylalanine 500 mg?

Best Naturals L-Phenylalanine 500 mg contains 1 active ingredients: L-Phenylalanine (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Best Naturals L-Phenylalanine 500 mg safe to take?

GoodSupp reviewed the inactive-ingredient data available for Best Naturals L-Phenylalanine 500 mg. All 7 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Best Naturals a trustworthy supplement brand?

Best Naturals receives a brand trust score of 74/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2012 and headquartered in Piscataway, New Jersey, USA, the company offers 129 products in their lineup. Note: Best Naturals has 2 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.