21st Century Biotin 10,000 mcg
vs
Douglas Laboratories Calcium-D-Glucarate
Supplement Comparison

  • Calcium: 21st Century Biotin 10,000 mcg has 52% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 5 nutrients compared
Bar chart: per-serving label amounts and listed forms for 21st Century Biotin 10,000 mcg vs Douglas Laboratories Calcium-D-Glucarate.

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 Biotin 10,000 mcg have?

  • Vitamin B7 (Biotin) appears as D-Biotin
  • Calcium appears as Calcium Carbonate

Which active ingredients does Douglas Laboratories Calcium-D-Glucarate have?

  • Calcium appears as Calcium as Calcium-D-Glucarate
  • Calcium D-Glucarate

Which categories do 21st Century Biotin 10,000 mcg and Douglas Laboratories Calcium-D-Glucarate belong to?

  • Single Vitamin
  • Antioxidant Complex

What health concerns do 21st Century Biotin 10,000 mcg and Douglas Laboratories Calcium-D-Glucarate address?

  • Energy & Metabolism
  • General Health
  • Skin, Hair & Nail Health
  • Liver & Detox Support

Which product has a higher amount of Calcium per serving?

  • 21st Century Biotin 10,000 mcg has the highest total amount of Calcium: 96 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • 21st Century Biotin 10,000 mcg: 1 tablet
    • Douglas Laboratories Calcium-D-Glucarate: 1 capsule
  • Vitamin B7 (Biotin)
    • This supplement has 10000 mcg
    • Adequate Intake in men: 30 mcg
    • Adequate Intake in women: 30 mcg
    • Tolerable Upper Intake Level: Not established
  • Calcium
    • This supplement has 96 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 63 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg

Last updated: February 19, 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