Ending the NIH embargo accelerated public access to funded research, but substantial delays remain

RESUMO

On 1 July 2025 the National Institutes of Health began requiring that funded articles be publicly available in PubMed Central on the day they are published, ending the 12-month embargo that had applied since 2008. Comparing NIH-supported articles with articles in the same journals and months that reported no US federal support, before and after the policy, the share available in PubMed Central within a week of publication rose by 5.6 percentage points more for NIH-supported articles (95% CI 1.9 to 9.6). The change was concentrated in journals outside the Directory of Open Access Journals, where the share of NIH-supported articles in PubMed Central within a week doubled from 11% to 22%, with no differential change in DOAJ-listed journals. A pre-policy comparison showed no difference. For articles published in early 2026, the policy had made NIH-supported research available sooner, and most NIH-supported articles in journals outside the Directory were still not in PubMed Central a week after publication.