Doctor's Best Vitamin C
vs
Metagenics Sinuplex
Supplement Comparison

  • Vitamin C: Doctor's Best Vitamin C has 6.7× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 8 nutrients compared
Bar chart: per-serving label amounts and listed forms for Doctor's Best Vitamin C vs Metagenics Sinuplex.

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Frequently asked questions

Which active ingredients does Doctor's Best Vitamin C have?

  • Vitamin C appears as Q-C Ascorbic Acid

Which active ingredients does Metagenics Sinuplex have?

  • Vitamin C appears as Ascorbic Acid
  • N-Acetyl-L-Cysteine (NAC)
  • Quercetin
  • Bromelain appears as Bromelain (from pineapple stem, 2,400 GDU/gram)
  • Stinging Nettle (Urtica dioica) Root appears as Stinging Nettle (Urtica dioica) Root 7:1 Extract

Which categories do Doctor's Best Vitamin C and Metagenics Sinuplex belong to?

  • Single Vitamin
  • Herbal Extract

What health concerns do Doctor's Best Vitamin C and Metagenics Sinuplex address?

  • Antioxidant Support
  • Immune System Support
  • Respiratory Health

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:
    • Doctor's Best Vitamin C: 1 capsule
    • Metagenics Sinuplex: 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
  • Vitamin C
    • This supplement has 150 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg

Last updated: February 15, 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