On January 30, 2023, the NIH launched a project to make preprints that are the result of NIH funding fully available in PubMed Central and, by extension, making their citations listed in PubMed.
This includes preprints posted to the following servers:
The National Library of Medicine defines a preprint a "complete and public drafts of scientific documents, not yet certified by peer review" (NIH Preprints). After researchers write a paper and submit it to a journal for peer review, they will upload the paper to a preprint server like bioRxiv, Research Square, or medRxiv where anyone can read the work. It is important to note that preprints are not certified by peer review, which is the primary distinction between a preprint version of a paper and the final published version.
On the citation page: If a publication is a preprint, it will generally have a large, light-blue banner at the top of the PubMed Entry.
