Thorne Ferrasorb
vs
Klean Athlete Klean Pre-Workout
Supplement Comparison

  • Vitamin C: Klean Athlete Klean Pre-Workout has 10× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 15 nutrients compared
Bar chart: per-serving label amounts and listed forms for Thorne Ferrasorb vs Klean Athlete Klean Pre-Workout.

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Frequently asked questions

Which active ingredients does Thorne Ferrasorb have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B6 (Pyridoxine) appears as Pyridoxal 5-Phosphate
  • Vitamin B9 (Folate) appears as L-5-Methyltetrahydrofolate
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • Iron appears as Ferrochel Ferrous Bisglycinate Chelate (Albion)

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 Thorne Ferrasorb and Klean Athlete Klean Pre-Workout belong to?

  • Single Mineral
  • Sports Formula

What health concerns do Thorne Ferrasorb and Klean Athlete Klean Pre-Workout address?

  • Energy & Metabolism
  • Women's Health
  • Antioxidant Support
  • Athletic Performance

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

  • Klean Athlete Klean Pre-Workout has the highest total amount of Vitamin C: 150 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Thorne Ferrasorb: 1 capsule
    • Klean Athlete Klean Pre-Workout: 10 g
  • Vitamin C
    • This supplement has 15 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 5 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.3 mg
    • Tolerable Upper Intake Level: 100 mg
  • Vitamin B9 (Folate)
    • This supplement has 667 mcg DFE
    • Recommended Dietary Allowance in men: 400 mcg DFE
    • Recommended Dietary Allowance in women: 400 mcg DFE
    • Tolerable Upper Intake Level: 1000 mcg DFE
  • Vitamin B12 (Cobalamin)
    • This supplement has 300 mcg
    • Recommended Dietary Allowance in men: 2.4 mcg
    • Recommended Dietary Allowance in women: 2.4 mcg
    • Tolerable Upper Intake Level: Not established
  • Iron
    • This supplement has 36 mg
    • Recommended Dietary Allowance in men: 8 mg
    • Recommended Dietary Allowance in women: 18 mg
    • Tolerable Upper Intake Level: 45 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 9, 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