Vitamin D

Expert Positions

Andrew Huberman

Recommends as Foundational

Peter Attia

Cautious — Lifestyle Over Supplement

Rhonda Patrick

Strongly Recommends

Bryan Johnson

Includes in Protocol

Mark Hyman

Strongly Recommends as Essential

The Verdict

4 of 5 experts recommend vitamin D supplementation for those with suboptimal levels, though Attia urges caution — arguing that the health benefits attributed to high vitamin D may actually come from the outdoor lifestyle needed to achieve them naturally. Patrick is the strongest advocate, citing a 40% reduction in dementia risk.