Life Extension Cognitex® Elite Pregnenolone
vs
21st Century Vitamin D3 5000 IU
Supplement Comparison

  • Calcium: Life Extension Cognitex® Elite Pregnenolone has 2.2× more
  • 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 Life Extension Cognitex® Elite Pregnenolone vs 21st Century Vitamin D3 5000 IU.

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Frequently asked questions

Which active ingredients does Life Extension Cognitex® Elite Pregnenolone have?

  • Calcium appears as DiCalcium Phosphate
  • Phosphorus appears as DiCalcium Phosphate
  • Phosphatidylserine
  • Uridine-5-Monophosphate
  • Pregnenolone
  • Ashwagandha appears as Sensoril Ashwagandha
  • Wild Blueberry Complex
  • Sage appears as SIBELIUS SAGE extract
  • Vinpocetine

Which active ingredients does 21st Century Vitamin D3 5000 IU have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Calcium appears as Calcium Carbonate

Which categories do Life Extension Cognitex® Elite Pregnenolone and 21st Century Vitamin D3 5000 IU belong to?

  • Antioxidant Complex
  • Hormone Support Formula
  • Single Vitamin

What health concerns do Life Extension Cognitex® Elite Pregnenolone and 21st Century Vitamin D3 5000 IU address?

  • Brain, Focus & Cognitive Function
  • Hormonal Balance
  • Mood Support
  • General Health
  • Heart & Cardiovascular Health
  • Immune System Support
  • Joint & Bone Health

Which product has a higher amount of Calcium per serving?

  • Life Extension Cognitex® Elite Pregnenolone has the highest total amount of Calcium: 200 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Cognitex® Elite Pregnenolone: 2 tablets
    • 21st Century Vitamin D3 5000 IU: 1 tablet
  • Calcium
    • This supplement has 200 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 160 mg
    • Recommended Dietary Allowance in men: 700 mg
    • Recommended Dietary Allowance in women: 700 mg
    • Tolerable Upper Intake Level: 4000 mg
  • Vitamin D
    • This supplement has 5000 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Calcium
    • This supplement has 90 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg

Last updated: February 13, 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