The National Institutes of Health (NIH), through the National Heart, Lung, and Blood Institute (NHLBI), is offering a funding opportunity for investigator-initiated single-site clinical trials under the R61/R33 phased award mechanism. This grant aims to support the development and implementation of clinical trials that focus on efficacy, comparative effectiveness, and pragmatic or implementation research, with an emphasis on innovative trial designs and reducing health disparities. The funding is particularly important for enhancing public health knowledge and engaging diverse perspectives in health research. Interested applicants, including higher education institutions, nonprofits, and government entities, can find more information and application guidelines at the NIH website, with submissions accepted until September 11, 2025. For inquiries, contact the NIH OER Webmaster at OERWebmaster03@od.nih.gov.