About
Evidence policy
A source link shows where a statement can be checked; it does not turn a mechanism into a proven outcome. We keep those ideas separate throughout the library.
Policy page; evidence classifications explain scope, not certainty.
Source links
When a page has direct sources, each visible link points to the cited record. Citation-free framework pages say so instead of displaying a fabricated reference.
Evidence labels
Established, emerging, traditional, and contested labels describe the scope and maturity of the material available for a topic. They are not guarantees, diagnoses, or treatment recommendations.
Read the limits
Study species, dose, formulation, population, design, and outcome all matter. A finding in cells or animals is not automatically a finding in people, and a study of one ingredient is not automatically evidence for a finished product.