free search engine accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics.
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provides curated consumer health information in English and Spanish
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MedlinePlus
TOXNET
NIH Drug Information Portal
Images from the History of Medicine
Digital Collections
LocatorPlus
MeSH
UMLS
ClinicalTrials.gov
All NLM Databases & APIs
The United States National Library of Medicine (NLM) is operated by the National Institutes of Health (NIH). NLM is the world's largest medical library, and is located in Bethesda, Maryland.