Google’s AI Overviews may be relying on YouTube more than official medical sources when answering health questions, according to new research from SEO platform SE Ranking.
The study analyzed 50,807 German-language health prompts and keywords, captured in a one-time snapshot from December using searches run from Berlin.
The report lands amid renewed scrutiny of health-related AI Overviews. Earlier this month, The Guardian published an investigation into misleading medical summaries appearing in Google Search. The outlet later reported Google had removed AI Overviews for some medical queries.
What The Study Measured
SE Ranking’s analysis focused on which sources Google’s AI Overviews cite for health-related queries. In that dataset, the company says AI Overviews appeared on more than 82% of health searches, making health one of the categories where users are most likely to see a generated summary instead of a list of links.
The report also cites consumer survey findings suggesting people increasingly treat AI answers as a substitute for traditional search, including in health. It cites figures including 55% of chatbot users trusting AI for health advice and 16% saying they’ve ignored a doctor’s advice because AI said otherwise.
YouTube Was The Most Cited Source
Across SE Ranking’s dataset, YouTube accounted for 4.43% of all AI Overview citations, or 20,621 citations out of 465,823.
The next most cited domains were ndr.de (14,158 citations, 3.04%) and MSD Manuals (9,711 citations, 2.08%), according to the report.
The authors argue that the ranking matters because YouTube is a general-purpose platform with a mixed pool of creators. Anyone can publish health content there, including licensed clinicians and hospitals, but also creators without medical training.
To check what the most visible YouTube citations looked like, SE Ranking reviewed the 25 most-cited YouTube videos in its dataset. It found 24 of the 25 came from medical-related channels, and 21 of the 25 clearly noted the content was created by a licensed or trusted source. It also warned that this set represents less than 1% of all YouTube links cited by AI Overviews.
Government & Academic Sources Were Rare
SE Ranking categorized citations into “more reliable” and “less reliable” groups based on the type of organization behind each source.
It reports that 34.45% of citations came from the more reliable group, while 65.55% came from sources “not designed to ensure medical accuracy or evidence-based standards.”
Within the same breakdown, academic research and medical journals accounted for 0.48% of citations, German government health institutions accounted for 0.39%, and international government institutions accounted for 0.35%.
AI Overview Citations Often Point To Different Pages Than Organic Search
The report compared AI Overview citations to organic rankings for the same prompts.
While SE Ranking found that 9 out of 10 domains overlapped between AI citations and…
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