NOW Foods Magnesium Citrate
vs
Metagenics Ultra Potent-C Vitamin C Powder
Supplement Comparison

  • Magnesium: NOW Foods Magnesium Citrate has 50× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 13 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Magnesium Citrate vs Metagenics Ultra Potent-C Vitamin C Powder.

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Frequently asked questions

Which active ingredients does NOW Foods Magnesium Citrate have?

  • Magnesium appears as Magnesium Citrate

Which active ingredients does Metagenics Ultra Potent-C Vitamin C Powder have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B3 (Niacin) appears as Nicotinic Acid
  • Calcium appears as Calcium Carbonate
  • Magnesium appears as Magnesium Oxide
  • Sodium appears as Sodium Chloride
  • L-Lysine appears as L-Lysine Monohydrochloride
  • Citrus Bioflavonoid Complex

Which categories do NOW Foods Magnesium Citrate and Metagenics Ultra Potent-C Vitamin C Powder belong to?

  • Single Mineral
  • Single Vitamin

What health concerns do NOW Foods Magnesium Citrate and Metagenics Ultra Potent-C Vitamin C Powder address?

  • Energy & Metabolism
  • General Health
  • Joint & Bone Health
  • Sleep Quality
  • Immune System Support

Which product has a higher amount of Magnesium per serving?

  • NOW Foods Magnesium Citrate 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 Citrate: 2 tablets
    • Metagenics Ultra Potent-C Vitamin C Powder: 0.3 teaspoons
  • Vitamin C
    • This supplement has 1088 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin B3 (Niacin)
    • This supplement has 84 mg
    • Recommended Dietary Allowance in men: 16 mg
    • Recommended Dietary Allowance in women: 14 mg
    • Tolerable Upper Intake Level: 35 mg
  • Calcium
    • This supplement has 50 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Sodium
    • This supplement has 15 mg
    • Adequate Intake in men: 1500 mg
    • Adequate Intake in women: 1500 mg
    • 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.
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  • Author: VIOscan Research Team