NOW Foods Vitamin D3 2500 IU
vs
Natural Factors Vitamin D3 & K2
Supplement Comparison

  • Vitamin D: NOW Foods Vitamin D3 2500 IU has 2.5× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 3 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Vitamin D3 2500 IU vs Natural Factors Vitamin D3 & K2.

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Frequently asked questions

Which active ingredients does NOW Foods Vitamin D3 2500 IU have?

  • Vitamin D appears as Cholecalciferol (D3)

Which active ingredients does Natural Factors Vitamin D3 & K2 have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin K appears as NattoMK-7 Vitamin K2 Menaquinone-7

Which categories do NOW Foods Vitamin D3 2500 IU and Natural Factors Vitamin D3 & K2 belong to?

  • Single Vitamin

What health concerns do NOW Foods Vitamin D3 2500 IU and Natural Factors Vitamin D3 & K2 address?

  • Brain, Focus & Cognitive Function
  • General Health
  • Heart & Cardiovascular Health
  • Immune System Support
  • Joint & Bone Health
  • Respiratory Health

Which product has a higher amount of Vitamin D per serving?

  • NOW Foods Vitamin D3 2500 IU has the highest total amount of Vitamin D: 2500 IU per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Vitamin D3 2500 IU: 1 softgel
    • Natural Factors Vitamin D3 & K2: 1 softgel
  • Vitamin D
    • This supplement has 2500 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Vitamin D
    • This supplement has 1000 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Vitamin K
    • This supplement has 120 mcg
    • Adequate Intake in men: 120 mcg
    • Adequate Intake in women: 90 mcg
    • Tolerable Upper Intake Level: Not established

Last updated: February 2, 2026

  • Sources & Methodology: Nutrient data and forms are taken directly from Supplement Facts labels. Reviewed and standardized by the VIOscan Research Team. Learn more on the Methodology page.
  • We show the Recommended Dietary Allowance (RDA) when available. If no RDA exists, we show the Adequate Intake (AI). Tolerable Upper Intake Levels (UL) are used for upper limits. Unless otherwise noted, RDAs shown correspond to healthy adults aged 19–50 years and are sex-specific. Separate values exist for 51–70 years and >70 years, and pregnancy and lactation are excluded. All values come from the Dietary Reference Intakes (DRIs) published by the National Academies of Sciences, Engineering, and Medicine (NASEM), Food and Nutrition Board (FNB).
  • Transparency: We’re funded by our users. We don’t have sponsors or affiliate links, and we don’t sell supplements.
  • Editorial standards: we provide independent, impartial and objective data analysis.
  • This analysis is for educational purposes only. It is not a substitute for medical advice.
  • Questions? Read our Frequently Asked Questions or contact us, we’re here to help.
  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team