Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength supplement bottle
Why Not Natural

Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength

What We Researched
3 active ingredients analyzed · 1 inactive ingredient decoded · 1 retailer compared · Last updated: Mar 2026
89
Product Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D3 (as Cholecalciferol) 250.0 mcg (10,000 IU) 1250%
Vitamin K2 (as MK-7 from Natto) 100.0 mcg 83%
Organic Spirulina (Arthrospira Platensis) 320.0 mg
Bioavailability Excellent

Absorption Rating

  • Vitamin D3 (as Cholecalciferol) Good
  • Vitamin K2 (as MK-7 from Natto) Good
  • Organic Spirulina (Arthrospira Platensis) Good
Other Ingredients Excellent

Fillers & Additives

  • Vegetable Capsules
Efficacy Fair

Dosage Analysis

  • Vitamin D3 (as Cholecalciferol) 250.0 mcg (10,000 IU) High
  • Vitamin K2 (as MK-7 from Natto) 100.0 mcg Effective
  • Organic Spirulina (Arthrospira Platensis) 320.0 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D3 (as Cholecalciferol) 250.0 mcg (10,000 IU) 1250%
Vitamin K2 (as MK-7 from Natto) 100.0 mcg 83%
Organic Spirulina (Arthrospira Platensis) 320.0 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$22$21$20$19$18 $19.97
Target

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

Brand Trust Report
Related Supplements
Frequently Asked Questions
Is Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength a good supplement?

Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength received a product quality score of 89/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 3 active ingredients with 60 servings per container. Of the 1 inactive ingredients, 0 are rated safe and 0 are flagged for review.

What are the ingredients in Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength?

Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength contains 3 active ingredients: Vitamin D3 (as Cholecalciferol) (250.0 mcg (10,000 IU)), Vitamin K2 (as MK-7 from Natto) (100.0 mcg), Organic Spirulina (Arthrospira Platensis) (320.0 mg). 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 Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength safe to take?

Why Not Natural Vitamin D3 K2 (MK-7) with Organic Spirulina, 10000 IU Extra Strength 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.

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.