Doctor's Best Natto-Serra, 90 Veggie Caps supplement bottle
Doctor's Best

Natto-Serra, 90 Veggie Caps

What We Researched
3 active ingredients analyzed · 2 inactive ingredients decoded · 1 brand certification checked · 3 retailers compared · Last updated: Mar 2026
83
Product Score Good
61
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium (from tricalcium phosphate and calcium stearate in Serrateric™) 29 mg 2%
Serrapeptase Enzyme (from Serratio sp.) 40,000 SPU**
Nattokinase (from fibrinase enzyme) 2,000 FU***
Bioavailability Good

Absorption Rating

  • Calcium (from tricalcium phosphate and calcium stearate in Serrateric™) Fair
  • Serrapeptase Enzyme (from Serratio sp.) Fair
  • Nattokinase (from fibrinase enzyme) Good
Other Ingredients Excellent

Fillers & Additives

  • Serrateric
  • Modified Cellulose
Efficacy Good

Dosage Analysis

  • Calcium (from tricalcium phosphate and calcium stearate in Serrateric™) 29 mg Under-dosed
  • Serrapeptase Enzyme (from Serratio sp.) 40,000 SPU** Effective
  • Nattokinase (from fibrinase enzyme) 2,000 FU*** Effective

Supplement Facts

Ingredient Amount % Daily Value
Calcium (from tricalcium phosphate and calcium stearate in Serrateric™) 29 mg 2%
Serrapeptase Enzyme (from Serratio sp.) 40,000 SPU**
Nattokinase (from fibrinase enzyme) 2,000 FU***

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Serrateric Unknown
Modified Cellulose Safe

Creates vegetarian capsule shells with controlled dissolution.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$29$27$25$23$21 Mar 12 $26.99$23.00
iHerb
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Doctor's Best

Founded 1990 · Tustin, California, USA · 186 products · doctorsbest.com

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source

Violation History

1 incident
Recall Red Yeast Rice2014-06-26Source
Related Supplements
Frequently Asked Questions
Is Doctor's Best Natto-Serra, 90 Veggie Caps a good supplement?

Doctor's Best Natto-Serra, 90 Veggie Caps received a product quality score of 83/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 3 active ingredients with 90 servings per container. Of the 2 inactive ingredients, 1 are rated safe and 0 are flagged for review. The manufacturer, Doctor's Best, holds a brand trust score of 61/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Doctor's Best Natto-Serra, 90 Veggie Caps?

Doctor's Best Natto-Serra, 90 Veggie Caps contains 3 active ingredients: Calcium (from tricalcium phosphate and calcium stearate in Serrateric™) (29 mg), Serrapeptase Enzyme (from Serratio sp.) (40,000 SPU**), Nattokinase (from fibrinase enzyme) (2,000 FU***). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Doctor's Best Natto-Serra, 90 Veggie Caps safe to take?

Doctor's Best Natto-Serra, 90 Veggie Caps has been analyzed for ingredient safety across all its components. 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 186 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Doctor's Best has 1 historical regulatory incident 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. 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.