NOW Foods Magnesium & Potassium Aspartate
vs
Douglas Laboratories Magnesium Citrate
Supplement Comparison

  • Magnesium: NOW Foods Magnesium & Potassium Aspartate has 67% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 5 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Magnesium & Potassium Aspartate vs Douglas Laboratories Magnesium Citrate.

Try the VIOscan dashboard demo for free

Build comparison charts in seconds – no signup or card needed

This is a free preview of the $9.99/month premium dashboard

Use the interactive demo with multivitamins samples

Try Free Demo

Frequently asked questions

Which active ingredients does NOW Foods Magnesium & Potassium Aspartate have?

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

Which active ingredients does Douglas Laboratories Magnesium Citrate have?

  • Magnesium appears as Magnesium Citrate

Which categories do NOW Foods Magnesium & Potassium Aspartate and Douglas Laboratories Magnesium Citrate belong to?

  • Mineral Complex
  • Single Mineral

What health concerns do NOW Foods Magnesium & Potassium Aspartate and Douglas Laboratories Magnesium Citrate address?

  • Athletic Performance
  • Energy & Metabolism
  • General Health
  • Heart & Cardiovascular Health
  • Muscle Support
  • Joint & Bone Health
  • Sleep Quality
  • Stress Management

Which product has a higher amount of Magnesium per serving?

  • NOW Foods Magnesium & Potassium Aspartate has the highest total amount of Magnesium: 250 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Magnesium & Potassium Aspartate: 2 capsules
    • Douglas Laboratories Magnesium Citrate: 1 capsule
  • Potassium
    • This supplement has 99 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.
  • 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