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Doctor's Best Best Nattokinase supplement bottle
Doctor's Best

Best Nattokinase Review

What We Researched
1 active ingredient analyzed · 3 inactive ingredients decoded · 1 brand certification checked · Page generated: Sep 2026
100
Product Score Excellent
61
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
Nattokinase 2000 FU †
Bioavailability Excellent

Absorption Rating

  • Nattokinase Good
Other Ingredients Excellent

Fillers & Additives

  • Modified Cellulose
  • Maltodextrin
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • Nattokinase 2000 FU Effective

Supplement Facts

Ingredient Amount % Daily Value
Nattokinase 2000 FU †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Modified Cellulose Safe

Creates vegetarian capsule shells with controlled dissolution.

Maltodextrin Generally_safe

Helps carry and stabilize active ingredients. Provides bulk.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Brand Trust Report
Doctor's Best

Founded 1990 · Tustin, California, USA · 351 products · doctorsbest.com

Certifications

1 certification
Fda Gmp Inspections Source available Primary evidence

Transparency

2 claims
Third Party Testing Claim — Claimed Evidence available Evidence

Violation History

3 incidents
Lawsuit False advertising and mislabeling of glucosamine supplements.2022 Source available Primary source
Recall Red Yeast Rice2014-06-26 Source available Primary source
Recall Red Yeast Rice 600 mg Capsules, 120-count bottles2014-06-24 Source checked Primary source
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Frequently Asked Questions
Is Doctor's Best Best Nattokinase a good supplement?

Doctor's Best Best Nattokinase 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 30 servings per container. All 3 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Doctor's Best, holds a brand trust score of 61/100.

What are the ingredients in Doctor's Best Best Nattokinase?

Doctor's Best Best Nattokinase contains 1 active ingredients: Nattokinase (2000 FU). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Doctor's Best Best Nattokinase safe to take?

GoodSupp reviewed the inactive-ingredient data available for Doctor's Best Best Nattokinase. All 3 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 Doctor's Best a trustworthy supplement brand?

Doctor's Best receives a brand trust score of 61/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1990 and headquartered in Tustin, California, USA, the company offers 351 products in their lineup. Note: Doctor's Best has 3 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.