Life Extension Bone Restore Elite with Super Potent K2
vs
21st Century Magnesium
Supplement Comparison

  • Magnesium: Life Extension Bone Restore Elite with Super Potent K2 has 20% more
  • Calcium: Life Extension Bone Restore Elite with Super Potent K2 has 11× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 14 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Bone Restore Elite with Super Potent K2 vs 21st Century Magnesium.

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Frequently asked questions

Which active ingredients does Life Extension Bone Restore Elite with Super Potent K2 have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin K appears as Vitamin K2 Menaquinone-4 (MK-4)
  • Calcium appears as Calcium Fructoborate
  • Magnesium appears as Magnesium Oxide
  • Zinc appears as Zinc Amino Acid Chelate
  • Manganese appears as Manganese Amino Acid Chelate
  • Boron
  • Silicon appears as Silicon Dioxide

Which active ingredients does 21st Century Magnesium have?

  • Calcium appears as Calcium Carbonate
  • Magnesium appears as Magnesium Oxide

Which categories do Life Extension Bone Restore Elite with Super Potent K2 and 21st Century Magnesium belong to?

  • Joint Formula
  • Mineral Complex

What health concerns do Life Extension Bone Restore Elite with Super Potent K2 and 21st Century Magnesium address?

  • Joint & Bone Health
  • Muscle Support
  • General Health
  • Sleep Quality
  • Stress Management

Which product has a higher amount of Magnesium per serving?

  • Life Extension Bone Restore Elite with Super Potent K2 has the highest total amount of Magnesium: 300 mg per serving

Which product has a higher amount of Calcium per serving?

  • Life Extension Bone Restore Elite with Super Potent K2 has the highest total amount of Calcium: 700 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Bone Restore Elite with Super Potent K2: 4 capsules
    • 21st Century Magnesium: 1 tablet
  • 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 45000 mcg
    • Adequate Intake in men: 120 mcg
    • Adequate Intake in women: 90 mcg
    • Tolerable Upper Intake Level: Not established
  • Calcium
    • This supplement has 700 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Zinc
    • This supplement has 2 mg
    • Recommended Dietary Allowance in men: 11 mg
    • Recommended Dietary Allowance in women: 8 mg
    • Tolerable Upper Intake Level: 40 mg
  • Manganese
    • This supplement has 1 mg
    • Adequate Intake in men: 2.3 mg
    • Adequate Intake in women: 1.8 mg
    • Tolerable Upper Intake Level: 11 mg
  • Calcium
    • This supplement has 65 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg

Last updated: February 13, 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.
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  • Author: VIOscan Research Team