Life Extension Black Elderberry + Vitamin C
vs
Douglas Laboratories Querciplex
Supplement Comparison

  • Vitamin C: Life Extension Black Elderberry + Vitamin C has 2.0× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 10 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Black Elderberry + Vitamin C vs Douglas Laboratories Querciplex.

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 Life Extension Black Elderberry + Vitamin C have?

  • Vitamin C appears as Ascorbic Acid
  • Calcium appears as DiCalcium Phosphate
  • Phosphorus appears as DiCalcium Phosphate
  • Black Elderberry Extract

Which active ingredients does Douglas Laboratories Querciplex have?

  • Vitamin C appears as Ascorbic Acid
  • Quercetin appears as Quercefit Quercetin Phytosome (Sophora japonica extract flower sunflower phospholipid complex)
  • Bromelain appears as Bromelain (Ananas comosus stem)

Which categories do Life Extension Black Elderberry + Vitamin C and Douglas Laboratories Querciplex belong to?

  • Herbal Extract
  • Antioxidant Complex

What health concerns do Life Extension Black Elderberry + Vitamin C and Douglas Laboratories Querciplex address?

  • Antioxidant Support
  • Immune System Support
  • Respiratory Health

Which product has a higher amount of Vitamin C per serving?

  • Life Extension Black Elderberry + Vitamin C has the highest total amount of Vitamin C: 200 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Black Elderberry + Vitamin C: 2 capsules
    • Douglas Laboratories Querciplex: 1 capsule
  • Vitamin C
    • This supplement has 200 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 210 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 170 mg
    • Recommended Dietary Allowance in men: 700 mg
    • Recommended Dietary Allowance in women: 700 mg
    • Tolerable Upper Intake Level: 4000 mg
  • Vitamin C
    • This supplement has 100 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 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