Mason Natural Vitamin K, 100 mcg, 100 Tablets supplement bottle
Mason Natural

Vitamin K, 100 mcg, 100 Tablets

What We Researched
1 active ingredient analyzed · 7 inactive ingredients decoded · 2 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
87
Product Score Good
66
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin K (phytonadione) 100 mcg 83%
Bioavailability Fair

Absorption Rating

  • Vitamin K (phytonadione) Fair
Other Ingredients Excellent

Fillers & Additives

  • Whey
  • Cellulose
  • Croscarmellose Sodium
  • Alfalfa powder
  • Stearic Acid
  • Dicalcium Phosphate
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • Vitamin K (phytonadione) 100 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin K (phytonadione) 100 mcg 83%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Whey Generally_safe

It is used as a filler or protein source.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Alfalfa powder Unknown
Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Dicalcium Phosphate Safe

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

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$7$6$5$4$3 Mar 12 $5.00
iHerb

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

Brand Trust Report
Mason Natural

Founded 1967 · Miami Lakes, Florida, USA · 161 products · masonvitamins.com

Certifications

2 certifications
Consumerlab Verified Source
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source

Violation History

4 incidents
Recall Herbal Colon Cleanser Capsules2025-09-02Source
Recall Healthy Sense Daily Multiple with Iron and People's Choice Women's Daily Vitamins with Iron2022-11-17Source
Prop 65 Lead2017-03-10Source
Prop 65 Lead2016-03-28Source
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Frequently Asked Questions
Is Mason Natural Vitamin K, 100 mcg a good supplement?

Mason Natural Vitamin K, 100 mcg, 100 Tablets received a product quality score of 87/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 1 active ingredients Of the 7 inactive ingredients, 5 are rated safe and 0 are flagged for review. The manufacturer, Mason Natural, holds a brand trust score of 66/100 with 2 verified certifications including Consumerlab, Fda Gmp Inspections.

What are the ingredients in Mason Natural Vitamin K, 100 mcg?

Mason Natural Vitamin K, 100 mcg contains 1 active ingredients: Vitamin K (phytonadione) (100 mcg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Mason Natural Vitamin K, 100 mcg safe to take?

Mason Natural Vitamin K, 100 mcg, 100 Tablets 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 Mason Natural a trustworthy supplement brand?

Mason Natural receives a brand trust score of 66/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1967 and headquartered in Miami Lakes, Florida, USA, the company offers 161 products in their lineup. They hold 2 verified certifications including Consumerlab, Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Mason Natural has 4 historical regulatory incidents on record, which are factored into the trust score.

How much vitamin d3 should i take daily?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What does vitamin d do?

This is an important question for supplement consumers. The dietary supplement industry is largely self-regulated, which means product quality, ingredient transparency, and safety practices vary significantly between brands and products. The most reliable way to evaluate any supplement is to check for third-party testing certifications, review the full ingredient list and dosages, and research the brand's regulatory track record. GoodSupp's database of over 250,000 analyzed products provides independent quality scores, ingredient safety ratings, and brand trust reports to help you make evidence-based decisions.

How much vitamin d3 per day for a woman?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

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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.