Life Extension Effervescent Vitamin C Magnesium Crystals
vs
Klean Athlete Klean Antioxidant
Supplement Comparison

  • Vitamin C: Life Extension Effervescent Vitamin C Magnesium Crystals has 36× 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 Life Extension Effervescent Vitamin C Magnesium Crystals vs Klean Athlete Klean Antioxidant.

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Frequently asked questions

Which active ingredients does Life Extension Effervescent Vitamin C Magnesium Crystals have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl
  • Magnesium appears as Magnesium Carbonate

Which active ingredients does Klean Athlete Klean Antioxidant have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B7 (Biotin) appears as D-Biotin
  • Alpha Lipoic Acid
  • Astaxanthin appears as AstaReal Astaxanthin (supercritical CO2 extract of Haematococcus pluvialis)
  • Acetyl-L-Carnitine appears as Acetyl-L-Carnitine Chloride
  • Maqui Berry appears as Delphinol

Which categories do Life Extension Effervescent Vitamin C Magnesium Crystals and Klean Athlete Klean Antioxidant belong to?

  • Single Mineral
  • Single Vitamin
  • Antioxidant Complex
  • Sports Formula

What health concerns do Life Extension Effervescent Vitamin C Magnesium Crystals and Klean Athlete Klean Antioxidant address?

  • Antioxidant Support
  • Digestive Support
  • General Health
  • Immune System Support
  • Athletic Performance
  • Cellular Health
  • Recovery & Repair

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

  • Life Extension Effervescent Vitamin C Magnesium Crystals has the highest total amount of Vitamin C: 4500 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Effervescent Vitamin C Magnesium Crystals: 1 teaspoon
    • Klean Athlete Klean Antioxidant: 3 capsules
  • Vitamin C
    • This supplement has 4500 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin B6 (Pyridoxine)
    • This supplement has 4 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.3 mg
    • Tolerable Upper Intake Level: 100 mg
  • Vitamin C
    • This supplement has 125 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin B7 (Biotin)
    • This supplement has 300 mcg
    • Adequate Intake in men: 30 mcg
    • Adequate Intake in women: 30 mcg
    • Tolerable Upper Intake Level: Not established

Last updated: February 12, 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