Life Extension Estrogen For Women
vs
21st Century Biotin 10,000 mcg
Supplement Comparison

  • Calcium: 21st Century Biotin 10,000 mcg has 37% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 13 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Estrogen For Women vs 21st Century Biotin 10,000 mcg.

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Frequently asked questions

Which active ingredients does Life Extension Estrogen For Women have?

  • Calcium appears as DiCalcium Phosphate
  • Phosphorus appears as DiCalcium Phosphate
  • Chaste Tree (Vitex agnus-castus) Extract
  • Licorice Root (Glycyrrhiza glabra)
  • Broccoli Extract
  • Soybean Extract
  • Norway Spruce Lignan Extract appears as HMRlignan Norway spruce (Picea abies) lignan extract
  • Dong Quai Extract

Which active ingredients does 21st Century Biotin 10,000 mcg have?

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

Which categories do Life Extension Estrogen For Women and 21st Century Biotin 10,000 mcg belong to?

  • Hormone Support Formula
  • Single Vitamin

What health concerns do Life Extension Estrogen For Women and 21st Century Biotin 10,000 mcg address?

  • Hormonal Balance
  • Women's Health
  • Energy & Metabolism
  • General Health
  • Skin, Hair & Nail Health

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:
    • Life Extension Estrogen For Women: 1 tablet
    • 21st Century Biotin 10,000 mcg: 1 tablet
  • Calcium
    • This supplement has 70 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 50 mg
    • Recommended Dietary Allowance in men: 700 mg
    • Recommended Dietary Allowance in women: 700 mg
    • Tolerable Upper Intake Level: 4000 mg
  • 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

Last updated: February 1, 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