Douglas Laboratories C-Max
vs
Metagenics Ultra Potent-C Vitamin C Powder
Supplement Comparison

  • Vitamin C: Douglas Laboratories C-Max has 38% more
  • Citrus Bioflavonoid Complex: Douglas Laboratories C-Max has 3.9× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 14 nutrients compared
Bar chart: per-serving label amounts and listed forms for Douglas Laboratories C-Max vs Metagenics Ultra Potent-C Vitamin C Powder.

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Frequently asked questions

Which active ingredients does Douglas Laboratories C-Max have?

  • Vitamin C appears as Ascorbic Acid
  • Citrus Bioflavonoid Complex
  • Rose Hip Powder appears as Rose Hips (Rosa canina, hips with seeds)

Which active ingredients does Metagenics Ultra Potent-C Vitamin C Powder have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B3 (Niacin) appears as Nicotinic Acid
  • Calcium appears as Calcium Carbonate
  • Magnesium appears as Magnesium Oxide
  • Sodium appears as Sodium Chloride
  • L-Lysine appears as L-Lysine Monohydrochloride
  • Citrus Bioflavonoid Complex

Which categories do Douglas Laboratories C-Max and Metagenics Ultra Potent-C Vitamin C Powder belong to?

  • Single Vitamin

What health concerns do Douglas Laboratories C-Max and Metagenics Ultra Potent-C Vitamin C Powder address?

  • Antioxidant Support
  • Immune System Support

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

  • Douglas Laboratories C-Max has the highest total amount of Vitamin C: 1500 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Douglas Laboratories C-Max: 1 tablet
    • Metagenics Ultra Potent-C Vitamin C Powder: 0.3 teaspoons
  • Vitamin C
    • This supplement has 1500 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 1088 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin B3 (Niacin)
    • This supplement has 84 mg
    • Recommended Dietary Allowance in men: 16 mg
    • Recommended Dietary Allowance in women: 14 mg
    • Tolerable Upper Intake Level: 35 mg
  • Calcium
    • This supplement has 50 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Sodium
    • This supplement has 15 mg
    • Adequate Intake in men: 1500 mg
    • Adequate Intake in women: 1500 mg
    • Tolerable Upper Intake Level: Not established

Last updated: February 21, 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