Doctor's Best High Absorption Iron
vs
Klean Athlete Klean Iron
Supplement Comparison

  • Iron: 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 Doctor's Best High Absorption Iron vs Klean Athlete Klean Iron.

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Frequently asked questions

Which active ingredients does Doctor's Best High Absorption Iron have?

  • Iron appears as Ferrochel Ferrous Bisglycinate Chelate (Albion)

Which active ingredients does Klean Athlete Klean Iron have?

  • Iron appears as Ferronyl Iron

Which categories do Doctor's Best High Absorption Iron and Klean Athlete Klean Iron belong to?

  • Single Mineral

What health concerns do Doctor's Best High Absorption Iron and Klean Athlete Klean Iron address?

  • Cellular Health
  • Immune System Support
  • Women's Health
  • Energy & Metabolism
  • General Health

Which product has a higher amount of Iron per serving?

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

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Doctor's Best High Absorption Iron: 1 tablet
    • Klean Athlete Klean Iron: 1 tablet
  • Iron
    • This supplement has 27 mg
    • Recommended Dietary Allowance in men: 8 mg
    • Recommended Dietary Allowance in women: 18 mg
    • Tolerable Upper Intake Level: 45 mg
  • Iron
    • This supplement has 27 mg
    • Recommended Dietary Allowance in men: 8 mg
    • Recommended Dietary Allowance in women: 18 mg
    • Tolerable Upper Intake Level: 45 mg

Last updated: February 3, 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