Douglas Laboratories C-Max
vs
Metagenics Glucosamine Sulfate
Supplement Comparison

  • Vitamin C: Douglas Laboratories C-Max has 17× 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 Douglas Laboratories C-Max vs Metagenics Glucosamine Sulfate.

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 Glucosamine Sulfate have?

  • Vitamin C appears as Ascorbic Acid
  • Potassium appears as Potassium from D-Glucosamine Sulfate Potassium Chloride
  • Glucosamine Sulfate appears as D-Glucosamine Sulfate Potassium Chloride

Which categories do Douglas Laboratories C-Max and Metagenics Glucosamine Sulfate belong to?

  • Single Vitamin
  • Joint Formula

What health concerns do Douglas Laboratories C-Max and Metagenics Glucosamine Sulfate address?

  • Antioxidant Support
  • Immune System Support
  • Joint & Bone Health

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 Glucosamine Sulfate: 3 tablets
  • 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 90 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Potassium
    • This supplement has 240 mg
    • Adequate Intake in men: 3400 mg
    • Adequate Intake in women: 2600 mg
    • Tolerable Upper Intake Level: Not established

Last updated: January 3, 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