NOW Foods Potassium Iodide
vs
Metagenics Mg/K Aspartate
Supplement Comparison

  • Potassium: Metagenics Mg/K Aspartate has 62% 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 NOW Foods Potassium Iodide vs Metagenics Mg/K Aspartate.

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Frequently asked questions

Which active ingredients does NOW Foods Potassium Iodide have?

  • Potassium appears as Potassium Iodide

Which active ingredients does Metagenics Mg/K Aspartate have?

  • Magnesium appears as Magnesium Aspartate
  • Potassium appears as Potassium Aspartate

Which categories do NOW Foods Potassium Iodide and Metagenics Mg/K Aspartate belong to?

  • Single Mineral
  • Mineral Complex

What health concerns do NOW Foods Potassium Iodide and Metagenics Mg/K Aspartate address?

  • Thyroid Support
  • Energy & Metabolism

Which product has a higher amount of Potassium per serving?

  • Metagenics Mg/K Aspartate has the highest total amount of Potassium: 160 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Potassium Iodide: 3 tablets
    • Metagenics Mg/K Aspartate: 2 tablets
  • Potassium
    • This supplement has 99 mg
    • Adequate Intake in men: 3400 mg
    • Adequate Intake in women: 2600 mg
    • Tolerable Upper Intake Level: Not established
  • Potassium
    • This supplement has 160 mg
    • Adequate Intake in men: 3400 mg
    • Adequate Intake in women: 2600 mg
    • Tolerable Upper Intake Level: Not established

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.
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  • Author: VIOscan Research Team