Life Extension Black Elderberry + Vitamin C
vs
Doctor's Best Vitamin C
Supplement Comparison

  • Vitamin C: Doctor's Best Vitamin C has 5.0× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 7 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Black Elderberry + Vitamin C vs Doctor's Best Vitamin C.

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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 Doctor's Best Vitamin C have?

  • Vitamin C appears as Q-C Ascorbic Acid

Which categories do Life Extension Black Elderberry + Vitamin C and Doctor's Best Vitamin C belong to?

  • Herbal Extract
  • Single Vitamin

What health concerns do Life Extension Black Elderberry + Vitamin C and Doctor's Best Vitamin C address?

  • Antioxidant Support
  • Immune System Support

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

  • Doctor's Best Vitamin C has the highest total amount of Vitamin C: 1000 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Black Elderberry + Vitamin C: 2 capsules
    • Doctor's Best Vitamin C: 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 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 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