21st Century Vitamin C
vs
Metagenics Bone Builder® with Boron
Supplement Comparison

  • Calcium: Metagenics Bone Builder® with Boron has 21× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 9 nutrients compared
Bar chart: per-serving label amounts and listed forms for 21st Century Vitamin C vs Metagenics Bone Builder® with Boron.

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Frequently asked questions

Which active ingredients does 21st Century Vitamin C have?

  • Vitamin C appears as Ascorbic Acid
  • Calcium appears as Calcium Carbonate

Which active ingredients does Metagenics Bone Builder® with Boron have?

  • Calcium appears as Calcium (MCHC, dicalcium phosphate)
  • Phosphorus appears as Phosphorus (MCHC, dicalcium phosphate)
  • Boron appears as Boric Acid
  • Microcrystalline Hydroxyapatite Concentrate (MCHC)

Which categories do 21st Century Vitamin C and Metagenics Bone Builder® with Boron belong to?

  • Single Vitamin
  • Joint Formula

What health concerns do 21st Century Vitamin C and Metagenics Bone Builder® with Boron address?

  • Antioxidant Support
  • Immune System Support
  • Joint & Bone Health

Which product has a higher amount of Calcium per serving?

  • Metagenics Bone Builder® with Boron has the highest total amount of Calcium: 620 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • 21st Century Vitamin C: 1 tablet
    • Metagenics Bone Builder® with Boron: 3 tablets
  • Vitamin C
    • This supplement has 500 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Calcium
    • This supplement has 30 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Calcium
    • This supplement has 620 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Phosphorus
    • This supplement has 350 mg
    • Recommended Dietary Allowance in men: 700 mg
    • Recommended Dietary Allowance in women: 700 mg
    • Tolerable Upper Intake Level: 4000 mg

Last updated: February 20, 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