About Marcus Webb — Senior Fact-Checker

Marcus Webb — Senior Fact-Checker

Marcus Webb leads the fact-checking desk at True Canine Probiotics, where he independently verifies every health, nutrition, and marketing claim published on this site. His work ensures that our readers receive accurate, evidence-based information about canine supplements and gut health.

Professional Background

Marcus spent 8 years at a national newspaper’s verification desk, where he developed rigorous methodologies for evaluating scientific claims, tracing sources, and identifying misleading marketing language. His fact-checks have been cited in consumer protection proceedings and industry publications.

Before transitioning to independent fact-checking, Marcus covered science and health beats, giving him deep familiarity with how research findings get distorted as they move from peer-reviewed journals to press releases to product labels.

Education & Credentials

  • B.S. in Biology — University of Michigan
  • Certificate in Science Communication — Massachusetts Institute of Technology (MIT)
  • 8 years professional fact-checking experience at a national publication

Areas of Expertise

  • Supplement label analysis and regulatory compliance (FDA, AAFCO, NASC)
  • Clinical trial methodology and statistical literacy
  • Marketing claim verification and source tracing
  • Science communication and evidence synthesis
  • Consumer protection standards in the pet supplement industry

Fact-Checking Methodology

Marcus applies a structured verification framework to every claim:

  1. Source identification — Trace the claim to its origin (peer-reviewed study, regulatory filing, or marketing assertion)
  2. Evidence evaluation — Assess study quality, sample sizes, conflicts of interest, and reproducibility
  3. Context verification — Determine whether the claim is supported, contradicted, or misrepresented by the evidence
  4. Verdict assignment — Apply standardized ratings: Verified, False, Misleading, or Unverifiable

Editorial Independence

Marcus operates with full editorial independence. His verdicts are based solely on available evidence, regardless of commercial relationships. True Canine Probiotics does not accept advertising from supplement brands, and no advertiser has input into fact-check outcomes.

Contact

For corrections, tip-offs, or right-of-reply requests: factcheck@truecanineprobiotics.com

All articles by Marcus Webb are independently fact-checked and reviewed before publication.