About
Dr. Marcus Webb is the last line of defense before any review goes live on The Well Panel. Every product — regardless of category — passes through his ingredient safety audit before publication. In practice, this means he has reviewed more products than any other panelist, with 182 audits completed since joining in 2022.
His background is clinical pharmacy, not sports nutrition or wellness marketing. He spent 12 years at UCSF Medical Center as a clinical pharmacist, where he developed expertise in drug-supplement interactions, contaminant testing interpretation, and the significant gap between what supplement labels claim and what independent testing reveals. He has seen patients hospitalized from supplement-drug interactions that a simple label audit would have flagged — which is why he takes his role at The Well Panel seriously.
He maintains a proprietary database of over 400 known supplement-drug interactions, updated monthly from primary literature and FDA adverse event reports. He also tracks the FDA's supplement warning letters and Class I recalls, which he cross-references against every product in our review pipeline.
His 71% pass rate is the highest on the panel and reflects a simple standard: if he can't verify what's in the product, he recommends a Pass. He is particularly unforgiving of proprietary blends, which he considers a consumer protection issue rather than a competitive advantage for brands.
He is not a wellness enthusiast. He is a scientist who believes people deserve to know exactly what they're putting in their bodies.
Testing Philosophy
"I don't care about the brand story or the packaging or whether the founder has a PhD. I care about two things: what's actually in the product, and whether it's safe. If you can't tell me what's in it — if it's a proprietary blend with no disclosed doses — I'm going to tell our readers to pass. That's not a high bar. It's the minimum."
Selected Publications
Webb M, et al. Supplement-drug interactions in outpatient cardiology patients. Ann Pharmacother. 2017.
Webb M. Label accuracy in the US dietary supplement market: a 5-year analysis. J Clin Pharm Ther. 2020.
Webb M, Chen S. Third-party certification as a proxy for label accuracy. Nutrients. 2023.
