NOW Foods C-1000 Zinc & D-3
vs
Klean Athlete Klean Collagen+C Tropical Fruit Flavor
Supplement Comparison

  • Vitamin C: NOW Foods C-1000 Zinc & D-3 has 20× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 9 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods C-1000 Zinc & D-3 vs Klean Athlete Klean Collagen+C Tropical Fruit Flavor.

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Frequently asked questions

Which active ingredients does NOW Foods C-1000 Zinc & D-3 have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin D appears as Cholecalciferol (D3)
  • Zinc appears as Zinc Bisglycinate

Which active ingredients does Klean Athlete Klean Collagen+C Tropical Fruit Flavor have?

  • Vitamin C appears as Mixed ascorbates from organic amla (Phyllanthus emblica)
  • Collagen Peptides appears as Hydrolyzed Collagen (from bovine)
  • Protein

Which categories do NOW Foods C-1000 Zinc & D-3 and Klean Athlete Klean Collagen+C Tropical Fruit Flavor belong to?

  • Single Mineral
  • Single Vitamin
  • Collagen

What health concerns do NOW Foods C-1000 Zinc & D-3 and Klean Athlete Klean Collagen+C Tropical Fruit Flavor address?

  • Antioxidant Support
  • General Health
  • Immune System Support
  • Joint & Bone Health
  • Athletic Performance
  • Healthy Aging & Longevity
  • Recovery & Repair
  • Skin, Hair & Nail Health

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

  • NOW Foods C-1000 Zinc & D-3 has the highest total amount of Vitamin C: 1000 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • NOW Foods C-1000 Zinc & D-3: 1 capsule
    • Klean Athlete Klean Collagen+C Tropical Fruit Flavor: 1 scoop
  • 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 D
    • This supplement has 2000 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Zinc
    • This supplement has 15 mg
    • Recommended Dietary Allowance in men: 11 mg
    • Recommended Dietary Allowance in women: 8 mg
    • Tolerable Upper Intake Level: 40 mg
  • Vitamin C
    • This supplement has 50 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg

Last updated: February 2, 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