Life Extension Vitamins D and K with Sea-Iodine
vs
Natural Factors Vitamin K2
Supplement Comparison

  • Vitamin K: Life Extension Vitamins D and K with Sea-Iodine has 18× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 8 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Vitamins D and K with Sea-Iodine vs Natural Factors Vitamin K2.

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Frequently asked questions

Which active ingredients does Life Extension Vitamins D and K with Sea-Iodine have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin K appears as Vitamin K1 Phytonadione
  • Vitamin K appears as Vitamin K2 Menaquinone-4 (MK-4)
  • Vitamin K appears as Vitamin K2 Menaquinone-7 (MK-7)
  • Iodine appears as Potassium Iodide

Which active ingredients does Natural Factors Vitamin K2 have?

  • Vitamin K appears as NattoMK-7 Vitamin K2 Menaquinone-7

Which categories do Life Extension Vitamins D and K with Sea-Iodine and Natural Factors Vitamin K2 belong to?

  • Single Mineral
  • Single Vitamin

What health concerns do Life Extension Vitamins D and K with Sea-Iodine and Natural Factors Vitamin K2 address?

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

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

  • Life Extension Vitamins D and K with Sea-Iodine has the highest total amount of Vitamin K: 1000 mcg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Vitamins D and K with Sea-Iodine: 1 capsule
    • Natural Factors Vitamin K2: 1 capsule
  • Vitamin D
    • This supplement has 5000 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 2100 mcg
    • Adequate Intake in men: 120 mcg
    • Adequate Intake in women: 90 mcg
    • Tolerable Upper Intake Level: Not established
  • Iodine
    • This supplement has 1000 mcg
    • Recommended Dietary Allowance in men: 150 mcg
    • Recommended Dietary Allowance in women: 150 mcg
    • Tolerable Upper Intake Level: 1100 mcg
  • 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 12, 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).
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  • 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.
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  • Author: VIOscan Research Team