PubMed is a free online resource developed and maintained by the National Center for Biotechnology Information (NCBI), at the U.S. National Library of Medicine (NLM), located at the National Institutes of Health (NIH). It is a popular resource for academic and students conducting biomedical research.
"PubMed comprises over 29 million citations for biomedical literature from MEDLINE, life science journals, and online books. PubMed citations and abstracts include the fields of biomedicine and health, covering portions of the life sciences, behavioral sciences, chemical sciences, and bioengineering. PubMed also provides access to additional relevant web sites and links to the other NCBI molecular biology resources."
The duality of PubMed is that while it continues to index high-ranking biomedical journals, its additional indexing of life science journals, and online books has caused an infiltration of predatory resources into the database.
This libguide provides 2 simple ways of navigating around the problem.