Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml) supplement bottle
Nature's Answer

Vitamin D3 & K2, 0.5 fl oz (15 ml)

What We Researched
2 active ingredients analyzed · 3 inactive ingredients decoded · 5 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
100
Product Score Excellent
78
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Vitamin D3** (as Cholecalciferol) (1000 IU) 25 mcg 126%
Vitamin K2 (as menaquinone-4) 120 mcg 100%
Bioavailability Excellent

Absorption Rating

  • Vitamin D3** (as Cholecalciferol) (1000 IU) Good
  • Vitamin K2 (as menaquinone-4) Good
Other Ingredients Excellent

Fillers & Additives

  • Olive Oil
  • Rosemary Extract
  • Natural Lemon Flavor
Efficacy Excellent

Dosage Analysis

  • Vitamin D3** (as Cholecalciferol) (1000 IU) 25 mcg Effective
  • Vitamin K2 (as menaquinone-4) 120 mcg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin D3** (as Cholecalciferol) (1000 IU) 25 mcg 126%
Vitamin K2 (as menaquinone-4) 120 mcg 100%

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Olive Oil Safe

Helps dissolve and absorb fat-soluble vitamins (A, D, E, K).

Rosemary Extract Safe

Prevents oxidation and extends shelf life naturally.

Natural Lemon Flavor Safe

It is used to add a lemon flavor to supplements.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$21$20$19$18$17 Mar 12 $18.74$18.74
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
Nature's Answer

Founded 1972 · Hauppauge, New York, United States · 234 products · naturesanswer.com

Certifications

5 certifications
Consumerlab Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Nsf Gmp Verified Source
Usda Organic Verified Source

Transparency

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

Violation History

3 incidents
Recall Coral Calcium2021-05-13Source
Fda Warning Product (Coral Calcium) contained cesium chloride, which is considered a new dietary ingredient that has not been shown to be safe. The product was deemed adulterated.2021-05-05Source
Prop 65 Lead2014-08-19Source
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Frequently Asked Questions
Is Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml) a good supplement?

Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml) 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 2 active ingredients with 250 servings per container. All 3 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Nature's Answer, holds a brand trust score of 78/100 with 5 verified certifications including Consumerlab, Fda Gmp Inspections, Non Gmo Project, Nsf Gmp.

What are the ingredients in Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml)?

Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml) contains 2 active ingredients: Vitamin D3** (as Cholecalciferol) (1000 IU) (25 mcg), Vitamin K2 (as menaquinone-4) (120 mcg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml) safe to take?

Nature's Answer Vitamin D3 & K2, 0.5 fl oz (15 ml) has been analyzed for ingredient safety across all its components. All 3 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Nature's Answer a trustworthy supplement brand?

Nature's Answer receives a brand trust score of 78/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1972 and headquartered in Hauppauge, New York, United States, the company offers 234 products in their lineup. They hold 5 verified certifications including Consumerlab, Fda Gmp Inspections, Non Gmo Project, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Nature's Answer has 3 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.