New research indicates that YouTube is the most frequently cited source in Google's AI Overviews for vitamin and supplement-related searches, appearing in over half of the AI-generated summaries. This study analyzed 350 AI Overviews from August 30 to September 5, 2026, using queries derived from Google Autocomplete. While YouTube dominated, other health-focused websites like GoodRx, Healthline, and Cleveland Clinic were also frequently cited, though less often than the video platform. The research also highlighted that a significant portion of cited pages in AI Overviews did not appear in the standard organic search results. AI
IMPACT Highlights how AI search features are surfacing video content, potentially impacting traffic to health information sites.
RANK_REASON Analysis of Google AI Overviews citing external sources.
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- AI Overviews
- Cleveland Clinic
- GoodRx
- Google Suggest
- Healthline
- United States National Institutes of Health
- YouTube
AI-generated summary · Google Gemini · from 1 sources. How we write summaries →