Overview
- SE Ranking analyzed 50,807 German‑language health searches and found AI Overviews cited YouTube in 4.43% of references, more than any single medical site.
- AI Overviews appeared on more than 82% of health queries in the snapshot, indicating any systemic sourcing pattern could affect many users.
- Google argues the study misclassifies trustworthy sources and says 96% of the 25 most‑cited YouTube videos came from medical channels such as hospitals and clinics.
- The report estimates about 34% of citations came from institutions it classed as trusted medical sources, with the remainder from general or commercial sites.
- Researchers and outside experts warn that drawing from a general video platform poses structural safety risks, while noting the findings reflect a December 2025 German snapshot that may not generalize.