Consensus Report
Vitamin D
Strong Consensus
out of 5
Based on 182 videos (134 hours analyzed) across 5 experts · Updated 2026-03-18
Expert Positions
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.
Where They Disagree
Attia argues that the health benefits attributed to vitamin D may actually come from the outdoor lifestyle (exercise, sunlight exposure) rather than the vitamin itself — a confounding variable that most studies don't adequately control for. Patrick and Hyman disagree, citing intervention studies where supplementation alone improved outcomes.
Optimal blood levels are contested: Patrick and Hyman target 50-80 ng/mL, while Attia is more cautious about overshooting, warning about hypervitaminosis D and noting that assays are unreliable.
+ 2 more disagreements in the full report
About This Analysis
This consensus report on Vitamin D is based on 182 videos (134 hours analyzed) from five longevity experts: Andrew Huberman, Peter Attia, Rhonda Patrick, Bryan Johnson, and Mark Hyman. Each expert's position was independently analyzed from their published video content, including lectures, podcast episodes, and Q&A sessions with 1,000+ guest scientists.
The full report includes 7 key findings, dosage and protocol details, expert deep dives with direct video citations and timestamps, risk considerations, and related supplement synergies.
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Every recommendation traces back to a specific expert, video, and timestamp.
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