Doctor's Best Fully Active Folate 400
vs
Klean Athlete Klean Collagen+C
Supplement Comparison

  • Vitamin C: Klean Athlete Klean Collagen+C has 25% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 7 nutrients compared
Bar chart: per-serving label amounts and listed forms for Doctor's Best Fully Active Folate 400 vs Klean Athlete Klean Collagen+C.

Try the VIOscan dashboard demo for free

Build comparison charts in seconds – no signup or card needed

This is a free preview of the $9.99/month premium dashboard

Use the interactive demo with multivitamins samples

Try Free Demo

Frequently asked questions

Which active ingredients does Doctor's Best Fully Active Folate 400 have?

  • Vitamin C appears as Ascorbic Acid
  • Vitamin B9 (Folate) appears as Quatrefolic (6S)-5-MTHF Glucosamine Salt

Which active ingredients does Klean Athlete Klean Collagen+C have?

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

Which categories do Doctor's Best Fully Active Folate 400 and Klean Athlete Klean Collagen+C belong to?

  • Single Vitamin
  • Collagen

What health concerns do Doctor's Best Fully Active Folate 400 and Klean Athlete Klean Collagen+C address?

  • Brain, Focus & Cognitive Function
  • Immune System Support
  • Methylation Support
  • Mood Support
  • Athletic Performance
  • Healthy Aging & Longevity
  • Joint & Bone Health
  • Recovery & Repair
  • Skin, Hair & Nail Health

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

  • Klean Athlete Klean Collagen+C has the highest total amount of Vitamin C: 50 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Doctor's Best Fully Active Folate 400: 1 capsule
    • Klean Athlete Klean Collagen+C: 1 scoop
  • Vitamin C
    • This supplement has 40 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Vitamin B9 (Folate)
    • This supplement has 400 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 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 15, 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