NOW Foods C-1000
vs
Klean Athlete Klean Pre-Workout
Supplement Comparison

  • Vitamin C: NOW Foods C-1000 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
    • 9 nutrients compared
Bar chart: per-serving label amounts and listed forms for NOW Foods C-1000 vs Klean Athlete Klean Pre-Workout.

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Frequently asked questions

Which active ingredients does NOW Foods C-1000 have?

  • Vitamin C appears as Ascorbic Acid
  • Citrus Bioflavonoid Complex
  • Rose Hips Powder

Which active ingredients does Klean Athlete Klean Pre-Workout have?

  • Vitamin C appears as Ascorbic Acid
  • Sodium appears as Sodium (naturally occurring)
  • Beet (Beta vulgaris) Root appears as TruBeet Beet Root Extract (providing nitrates)
  • Caffeine appears as PurCaf Organic Green Coffee Bean Extract

Which categories do NOW Foods C-1000 and Klean Athlete Klean Pre-Workout belong to?

  • Single Vitamin
  • Sports Formula

What health concerns do NOW Foods C-1000 and Klean Athlete Klean Pre-Workout address?

  • Antioxidant Support
  • General Health
  • Immune System Support
  • Athletic Performance
  • Energy & Metabolism

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

  • NOW Foods C-1000 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: 1 tablet
    • Klean Athlete Klean Pre-Workout: 10 g
  • 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
  • Sodium
    • This supplement has 140 mg
    • Adequate Intake in men: 1500 mg
    • Adequate Intake in women: 1500 mg
    • Tolerable Upper Intake Level: Not established

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