NOW Foods Iron
vs
California Gold Nutrition Organic Spirulina
Supplement Comparison

  • Iron: NOW Foods Iron has 26× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 8 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods Iron vs California Gold Nutrition Organic Spirulina.

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Frequently asked questions

Which active ingredients does NOW Foods Iron have?

  • Iron appears as Ferrochel Ferrous Bisglycinate Chelate (Albion)

Which active ingredients does California Gold Nutrition Organic Spirulina have?

  • Iron
  • Sodium
  • Chlorophyllin
  • Spirulina (Arthrospira platensis) Microalgae appears as Parry's Organic Spirulina
  • Phycocyanin
  • Total Carotenoids

Which categories do NOW Foods Iron and California Gold Nutrition Organic Spirulina belong to?

  • Single Mineral
  • Algae

What health concerns do NOW Foods Iron and California Gold Nutrition Organic Spirulina address?

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

Which product has a higher amount of Iron per serving?

  • NOW Foods Iron has the highest total amount of Iron: 18 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods Iron: 1 capsule
    • California Gold Nutrition Organic Spirulina: 3 tablets
  • Iron
    • This supplement has 18 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 0.7 mg
    • Recommended Dietary Allowance in men: 8 mg
    • Recommended Dietary Allowance in women: 18 mg
    • Tolerable Upper Intake Level: 45 mg
  • Sodium
    • This supplement has 15 mg
    • Adequate Intake in men: 1500 mg
    • Adequate Intake in women: 1500 mg
    • Tolerable Upper Intake Level: Not established

Last updated: February 2, 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