The National Institutes of Health (NIH) is offering a funding opportunity titled "Development and Testing of Novel Interventions to Improve HIV Prevention, Treatment, and Program Implementation for People Who Use Substances" under the R34 planning grant mechanism. This initiative aims to encourage formative research and the development of innovative interventions that target HIV prevention and care, particularly for populations that engage in substance use, addressing critical gaps in HIV care and prevention. Eligible applicants include a wide range of organizations such as higher education institutions, nonprofit entities, and tribal governments, with grants available for up to $450,000 over three years. The application cycle begins on April 7, 2025, with subsequent due dates throughout the year, and interested parties can reach out to NIH Grants Information at grantsinfo@nih.gov for further inquiries.