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PubMed (NIH)

The NIH's free database of biomedical literature, indexing 36M+ citations from MEDLINE and scientific journals. The canonical primary-source clinical-evidence layer AI engines retrieve from — especially Perplexity and Claude on clinical-fact queries.

PubMed is the National Institutes of Health's free database of biomedical and life-sciences literature, indexing more than 36 million citations from MEDLINE, scientific journals, and online books. It is maintained by the National Library of Medicine at NIH and operates as the canonical primary-source layer for clinical evidence in U.S. healthcare.

EPR's cross-industry AI citation research finds that Perplexity rewards NIH and PubMed primary sources more than any trade publication on healthcare queries, meaning healthcare PR programs running only trade-press outreach are leaving half the AI citation prize unclaimed. Trade press drives ChatGPT, Gemini, and Google AI Overviews on industry-news queries. PubMed and NEJM drive Perplexity and Claude on clinical-fact queries.

See: Healthcare PR Now Needs Two AI Strategies · The Healthcare Pillar.

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