Bronson K2 + D3 Extra Strength supplement bottle
Bronson

K2 + D3 Extra Strength

What We Researched
2 active ingredients analyzed · 6 inactive ingredients decoded · 3 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
95
Product Score Excellent
75
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D3 250 mcg 1250%
Vitamin K2 120 mcg
Bioavailability Excellent

Absorption Rating

  • Vitamin D3 Good
  • Vitamin K2 Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Stearic Acid
  • Magnesium Stearate
  • Silicon Dioxide
  • Hydroxypropyl Methylcellulose
  • Polyethylene Glycol Low
Efficacy Very Good

Dosage Analysis

  • Vitamin D3 250 mcg High
  • Vitamin K2 120 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D3 250 mcg 1250%
Vitamin K2 120 mcg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

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

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.

Hydroxypropyl Methylcellulose Safe

It is used as a coating for tablets and capsules.

Polyethylene Glycol Caution

It is used as a binder, coating agent, or to improve solubility.

Price Comparison

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

Brand Trust Report
Bronson

Founded 1960 · Hauppauge, NY, USA · 292 products · bronsonvitamins.com/

Certifications

3 certifications
Consumerlab Verified Source
Fda Gmp Inspections Verified Source
Usda Organic Verified Source

Transparency

3 claims
Third Party Testing Claim — Claimed Source
In House Testing — Verified Source

Violation History

4 incidents
Prop 65 Lead2024-08-25Source
Prop 65 Lead2013-01-22Source
Prop 65 Lead2012-03-08Source
Prop 65 Listed Chemical (not specified in snippet)2008-10-22Source
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Frequently Asked Questions
Is Bronson K2 + D3 Extra Strength a good supplement?

Bronson K2 + D3 Extra Strength received a product quality score of 95/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients with 120 servings per container. Of the 6 inactive ingredients, 5 are rated safe and 1 are flagged for review. The manufacturer, Bronson, holds a brand trust score of 75/100 with 3 verified certifications including Consumerlab, Fda Gmp Inspections, Usda Organic.

What are the ingredients in Bronson K2 + D3 Extra Strength?

Bronson K2 + D3 Extra Strength contains 2 active ingredients: Vitamin D3 (250 mcg), Vitamin K2 (120 mcg). Notable high-dose ingredients include Vitamin D3 at 1250% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Bronson K2 + D3 Extra Strength safe to take?

Bronson K2 + D3 Extra Strength has been analyzed for ingredient safety across all its components. Of 6 inactive ingredients, 5 are rated safe. 1 ingredient is flagged for review: Polyethylene Glycol. 'Caution' doesn't mean dangerous — it indicates the ingredient has some considerations worth being aware of, such as potential sensitivities or ongoing research. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Bronson a trustworthy supplement brand?

Bronson receives a brand trust score of 75/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1960 and headquartered in Hauppauge, NY, USA, the company offers 292 products in their lineup. They hold 3 verified certifications including Consumerlab, Fda Gmp Inspections, Usda Organic. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Bronson has 4 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. 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.