Thorne Quercetin Phytosome
vs
Life Extension Vitamin C and Bio-Quercetin
Supplement Comparison

  • Quercetin: Thorne Quercetin Phytosome has 50× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 4 nutrients compared
Bar chart: per-serving label amounts and listed forms for Thorne Quercetin Phytosome vs Life Extension Vitamin C and Bio-Quercetin.

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Frequently asked questions

Which active ingredients does Thorne Quercetin Phytosome have?

  • Quercetin appears as Quercetin Phytosome

Which active ingredients does Life Extension Vitamin C and Bio-Quercetin have?

  • Vitamin C appears as Ascorbic Acid
  • Quercetin appears as Bio-Quercetin Phytosome

Which categories do Thorne Quercetin Phytosome and Life Extension Vitamin C and Bio-Quercetin belong to?

  • Antioxidant Complex
  • Single Vitamin

What health concerns do Thorne Quercetin Phytosome and Life Extension Vitamin C and Bio-Quercetin address?

  • Anti-Inflammatory Support
  • Healthy Aging & Longevity
  • Immune System Support
  • Respiratory Health
  • Antioxidant Support
  • Heart & Cardiovascular Health

Which product has a higher amount of Quercetin per serving?

  • Thorne Quercetin Phytosome has the highest total amount of Quercetin: 250 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Thorne Quercetin Phytosome: 1 capsule
    • Life Extension Vitamin C and Bio-Quercetin: 1 tablet
  • Vitamin C
    • This supplement has 1000 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg

Last updated: February 9, 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.
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  • Author: VIOscan Research Team