NOW Foods Magnesium
vs
Metagenics Magnesium L-Threonate
Supplement Comparison

  • Magnesium: NOW Foods Magnesium has 4.1× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 2 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Magnesium vs Metagenics Magnesium L-Threonate.

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Frequently asked questions

Which active ingredients does NOW Foods Magnesium have?

  • Magnesium appears as Magnesium Oxide, Citrate and Aspartate

Which active ingredients does Metagenics Magnesium L-Threonate have?

  • Magnesium appears as Magtein Magnesium L-Threonate

Which categories do NOW Foods Magnesium and Metagenics Magnesium L-Threonate belong to?

  • Single Mineral

What health concerns do NOW Foods Magnesium and Metagenics Magnesium L-Threonate address?

  • Energy & Metabolism
  • General Health
  • Joint & Bone Health
  • Sleep Quality
  • Stress Management
  • Muscle Support
  • Brain, Focus & Cognitive Function

Which product has a higher amount of Magnesium per serving?

  • NOW Foods Magnesium has the highest total amount of Magnesium: 400 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Magnesium: 1 capsule
    • Metagenics Magnesium L-Threonate: 2 capsules

Last updated: February 15, 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