There are many platforms that archive preprints; some are subject-specific, others include preprints from multiple disciplines. Users are recommended to search multiple platforms to find the latest research on a specific topic. Preprints can also be found using non-preprint resources such as PubMed and Google Scholar.
Below are resources where users can search for preprints.
The National Library of Medicine (NLM) has launched a pilot project to test the viability of making preprints resulting from NIH-funded research available via PubMed Central (PMC). The primary goal of the NIH Preprint Pilot will be to explore approaches to increasing the discoverability of early NIH research results. The pilot started the week of June 8, 2020 and will initially focus on increasing the discoverability of preprints with NIH support relating to the current COVID-19 pandemic. For more information:
Update as of February 2022
As of February 2022, there are over 3,000 preprints reporting NIH-supported research on COVID-19 in PubMed Central (PMC) and PubMed. See: Public Access in PMC Update.