What we know, and how well we know it.

133 claims across 20 topics, drawn from 80 sources (80 peer-reviewed). Every one carries the conditions it depends on, who it does not apply to, how confident we are and why, and where the sources disagree with each other. Anything supported only by one person asserting it is not on these pages — how we count evidence.

This is a summary of published research, not medical advice. It cannot account for your medications, conditions or history. Talk to a clinician before acting on any of it.