21st Century Vitamin B-12 1000 mcg
vs
Metagenics Cardiogenics® Intensive Care
Supplement Comparison

  • Calcium: 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
    • 15 nutrients compared
Bar chart: per-serving label amounts and listed forms for 21st Century Vitamin B-12 1000 mcg vs Metagenics Cardiogenics® Intensive Care.

Try the VIOscan dashboard demo for free

Build comparison charts in seconds – no signup or card needed

This is a free preview of the $9.99/month premium dashboard

Use the interactive demo with multivitamins samples

Try Free Demo

Frequently asked questions

Which active ingredients does 21st Century Vitamin B-12 1000 mcg have?

  • Vitamin B12 (Cobalamin) appears as Cyanocobalamin
  • Calcium appears as Calcium Carbonate

Which active ingredients does Metagenics Cardiogenics® Intensive Care have?

  • Calcium appears as Calcium Citrate
  • Magnesium appears as Magnesium Citrate
  • Selenium appears as Selenium L-Aspartate
  • Potassium appears as Potassium Aspartate
  • Taurine
  • Hawthorn Berry (Crataegus spp.) extract appears as Hawthorn (Crataegus monogyna) Leaf and Flower 4:1 Extract contains hyperosides
  • Arjuna Extract appears as Arjuna (Terminalia arjuna) Bark 5:1 Extract contains tannins

Which categories do 21st Century Vitamin B-12 1000 mcg and Metagenics Cardiogenics® Intensive Care belong to?

  • Single Vitamin
  • Metabolic Support Formula

What health concerns do 21st Century Vitamin B-12 1000 mcg and Metagenics Cardiogenics® Intensive Care address?

  • General Health
  • Heart & Cardiovascular Health

Which product has a higher amount of Calcium per serving?

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

How do the serving sizes compare between the two supplements?

  • Serving size:
    • 21st Century Vitamin B-12 1000 mcg: 1 tablet
    • Metagenics Cardiogenics® Intensive Care: 3 tablets
  • Vitamin B12 (Cobalamin)
    • This supplement has 1000 mcg
    • Recommended Dietary Allowance in men: 2.4 mcg
    • Recommended Dietary Allowance in women: 2.4 mcg
    • Tolerable Upper Intake Level: Not established
  • Calcium
    • This supplement has 100 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 100 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Selenium
    • This supplement has 51 mcg
    • Recommended Dietary Allowance in men: 55 mcg
    • Recommended Dietary Allowance in women: 55 mcg
    • Tolerable Upper Intake Level: 400 mcg
  • Potassium
    • This supplement has 100 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.
  • 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