Definition
YMYL is Google's classification for pages whose content could materially affect a reader's finances, health, safety, or wellbeing. Includes medical, legal, financial, news, and consumer-safety content. Google's quality raters apply elevated E-E-A-T scrutiny to YMYL pages. AI engines mirror this elevated bar: citation eligibility for YMYL queries requires demonstrably credentialed authors, verifiable sources, and transparent corrections.
A blog post 'Symptoms of diabetes' must show: medical reviewer credentials, citations to peer-reviewed sources, last-reviewed date, contact info for the publishing entity.
How to optimize
Add author credentials with medical license / law-bar / CFA references. Cite primary sources (PubMed, gov docs). Add a 'medically reviewed by' line with date. Ship reasonable corrections policy.