21st Century Potassium Gluconate
vs
Douglas Laboratories Potassium Chelated
Supplement Comparison

  • Potassium: same total amount on both labels
  • 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 21st Century Potassium Gluconate vs Douglas Laboratories Potassium Chelated.

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Frequently asked questions

Which active ingredients does 21st Century Potassium Gluconate have?

  • Potassium appears as Potassium Gluconate

Which active ingredients does Douglas Laboratories Potassium Chelated have?

  • Potassium appears as Potassium Chelate Complex (Krebs: Citrate, Fumarate, Malate, Glutarate, Succinate)

Which categories do 21st Century Potassium Gluconate and Douglas Laboratories Potassium Chelated belong to?

  • Single Mineral

What health concerns do 21st Century Potassium Gluconate and Douglas Laboratories Potassium Chelated address?

  • General Health
  • Heart & Cardiovascular Health
  • Muscle Support
  • Energy & Metabolism

Which product has a higher amount of Potassium per serving?

  • Both products list the same total amount of Potassium per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • 21st Century Potassium Gluconate: 1 tablet
    • Douglas Laboratories Potassium Chelated: 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
  • 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 5, 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