Metagenics Magnesium Glycinate
vs
21st Century Magnesium
Supplement Comparison

  • Magnesium: 21st Century Magnesium 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
    • 4 nutrients compared
Bar chart: per-serving label amounts and listed forms for Metagenics Magnesium Glycinate vs 21st Century Magnesium.

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Frequently asked questions

Which active ingredients does Metagenics Magnesium Glycinate have?

  • Magnesium appears as Magnesium Bisglycinate

Which active ingredients does 21st Century Magnesium have?

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

Which categories do Metagenics Magnesium Glycinate and 21st Century Magnesium belong to?

  • Single Mineral
  • Mineral Complex

What health concerns do Metagenics Magnesium Glycinate and 21st Century Magnesium address?

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

Which product has a higher amount of Magnesium per serving?

  • 21st Century Magnesium has the highest total amount of Magnesium: 250 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Metagenics Magnesium Glycinate: 1 tablet
    • 21st Century Magnesium: 1 tablet
  • 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 4, 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.
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  • Author: VIOscan Research Team