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21st Century K2 MK-7 100 mcg supplement bottle
21st Century

K2 MK-7 100 mcg Review

What We Researched
1 active ingredient analyzed · 6 inactive ingredients decoded · 3 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
85
Brand Score Good

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
Vitamin K2 (as Menaquinone-7) (MK-7) 100 mcg **
Bioavailability Excellent

Absorption Rating

  • Vitamin K2 (as Menaquinone-7) (MK-7) Good
Other Ingredients Excellent

Fillers & Additives

  • Cellulose
  • Oat Fiber
  • Dicalcium Phosphate
  • Magnesium Silicate
  • Magnesium Stearate
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • Vitamin K2 (as Menaquinone-7) (MK-7) 100 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin K2 (as Menaquinone-7) (MK-7) 100 mcg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Oat Fiber Generally_safe

It is used as a filler or source of fiber.

Dicalcium Phosphate Safe

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

Magnesium Silicate Generally_safe

It is used to improve powder flow and prevent clumping.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
21st Century

Founded 1991 · Tempe, Arizona, United States · 383 products · 21stcenturyvitamins.com/

Certifications

3 certifications
Nsf Gmp Source available Primary evidence
NSF Contents Certified Supporting evidence unavailable
NSF Certified Supporting evidence unavailable

Transparency

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

Violation History

4 incidents
Prop 65 Lead2021-06-22 Source available Primary source
Recall Vitamin D3 5000 IU Tablets2021-05-19 Source available Primary source
Lawsuit False advertising of Glucosamine/Chondroitin supplements.2012 Source available Primary source
Prop 65 Lead2008-12-23 Source available Primary source
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Frequently Asked Questions
Is 21st Century K2 MK-7 100 mcg a good supplement?

21st Century K2 MK-7 100 mcg 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 All 6 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, 21st Century, holds a brand trust score of 85/100.

What are the ingredients in 21st Century K2 MK-7 100 mcg?

21st Century K2 MK-7 100 mcg contains 1 active ingredients: Vitamin K2 (as Menaquinone-7) (MK-7) (100 mcg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is 21st Century K2 MK-7 100 mcg safe to take?

GoodSupp reviewed the inactive-ingredient data available for 21st Century K2 MK-7 100 mcg. All 6 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 21st Century a trustworthy supplement brand?

21st Century receives a brand trust score of 85/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1991 and headquartered in Tempe, Arizona, United States, the company offers 383 products in their lineup. Note: 21st Century 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 — 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.