ChatGPT cites PubMed more, drops Reddit and Wikipedia in US answers
Ahrefs data shows ChatGPT’s most-cited sites in US answers shifted from March to September 2024. PubMed rose from 64th to 4th place, while WebMD fell from 18th to 79th. Government health sites, regulators, and product testers gained prominence, while health/finance explainers like Britannica and Investopedia dropped out of the top 200. Reddit’s share of cited domains dropped from 19.1% to 2.3%,…
Key points
- PubMed climbed to 4th place in ChatGPT’s US citations (March: 64th), while WebMD dropped to 79th (March: 18th)
- Reddit’s share of cited domains fell from 19.1% to 2.3% in US answers, Wikipedia’s from 14.1% to 2.9%
- 14.4% of 66.6M free ChatGPT responses included web searches, averaging 1.6 fan-out queries per search
The story so far
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ChatGPT’s Most-Cited Sites Tilt Toward Primary Sources, Data Shows via @sejournal, @MattGSouthern
Search Engine Journal · 12 October 2026
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This text was published by Search Engine Journal and written by Matt G. Southern. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗
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