NOW Foods Calcium & Magnesium
vs
Klean Athlete Klean Electrolytes
Supplement Comparison

  • Magnesium: NOW Foods Calcium & Magnesium has 13× more
  • Calcium: NOW Foods Calcium & Magnesium has 27× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 16 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Calcium & Magnesium vs Klean Athlete Klean Electrolytes.

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Frequently asked questions

Which active ingredients does NOW Foods Calcium & Magnesium have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Calcium appears as Calcium Carbonate and Citrate
  • Magnesium appears as Magnesium Oxide and Citrate
  • Zinc appears as Zinc Oxide

Which active ingredients does Klean Athlete Klean Electrolytes have?

  • Vitamin B6 (Pyridoxine) appears as Pyridoxal 5-Phosphate
  • Calcium appears as Calcium amino acid chelate/complex
  • Magnesium appears as Magnesium Chelate
  • Chloride appears as Chloride from Sodium Chloride
  • Sodium appears as Sodium Chloride
  • Potassium appears as Potassium Chelate

Which categories do NOW Foods Calcium & Magnesium and Klean Athlete Klean Electrolytes belong to?

  • Mineral Complex
  • Single Mineral
  • Sports Formula

What health concerns do NOW Foods Calcium & Magnesium and Klean Athlete Klean Electrolytes address?

  • General Health
  • Heart & Cardiovascular Health
  • Joint & Bone Health
  • Athletic Performance
  • Muscle Support
  • Energy & Metabolism

Which product has a higher amount of Magnesium per serving?

  • NOW Foods Calcium & Magnesium has the highest total amount of Magnesium: 333 mg per serving

Which product has a higher amount of Calcium per serving?

  • NOW Foods Calcium & Magnesium has the highest total amount of Calcium: 667 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Calcium & Magnesium: 2 softgels
    • Klean Athlete Klean Electrolytes: 1 capsule
  • Vitamin D
    • This supplement has 400 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Calcium
    • This supplement has 667 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Zinc
    • This supplement has 25 mg
    • Recommended Dietary Allowance in men: 11 mg
    • Recommended Dietary Allowance in women: 8 mg
    • Tolerable Upper Intake Level: 40 mg
  • Vitamin B6 (Pyridoxine)
    • This supplement has 7 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.3 mg
    • Tolerable Upper Intake Level: 100 mg
  • Calcium
    • This supplement has 25 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Chloride
    • This supplement has 60 mg
    • Adequate Intake in men: 2300 mg
    • Adequate Intake in women: 2300 mg
    • Tolerable Upper Intake Level: 3600 mg
  • Sodium
    • This supplement has 40 mg
    • Adequate Intake in men: 1500 mg
    • Adequate Intake in women: 1500 mg
    • Tolerable Upper Intake Level: Not established
  • Potassium
    • This supplement has 25 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