Social disconnection and Suicide Risk in Late Life (R21 Clinical Trial Optional) | PAR 25 066

Opportunity Information: Apply for PAR 25 066

The National Institutes of Health (NIH) is offering a discretionary grant opportunity titled "Social disconnection and Suicide Risk in Late Life (R21 Clinical Trial Optional)" under Funding Opportunity Number PAR-25-066 (CFDA 93.242). The focus is on late-life suicide risk and how it is shaped by social disconnection, specifically drawing a clear distinction between objective social isolation (for example, limited social contacts or infrequent interaction) and perceived social isolation, commonly described as loneliness. The opportunity is designed to support research projects that can clarify how these forms of disconnection contribute to suicidal thoughts and behaviors in older adults, and how that knowledge can be used to prevent suicide.

A major emphasis of the announcement is on understanding mechanisms. NIH is encouraging studies that identify neurobiological and environmental pathways through which social isolation and loneliness increase suicide risk in late life. This could include work that examines brain, stress, inflammatory, or other biological processes alongside contextual factors such as bereavement, caregiving burdens, reduced mobility, chronic illness, disability, poverty, discrimination, or barriers to accessing supportive services. The goal is not simply to document correlations, but to pinpoint actionable mechanisms that help explain why social disconnection becomes dangerous for some older adults and under what conditions risk escalates.

Another central priority is the use of an experimental therapeutics approach. In practice, that means proposals should be framed around identifying measurable intervention targets, developing or refining interventions that engage those targets, and testing whether changing the target also changes suicide-related outcomes. The "clinical trial optional" designation signals that applicants may propose either clinical trials or non-trial studies, depending on what best fits the question and stage of research. Projects might, for example, test strategies meant to reduce loneliness, increase meaningful social contact, improve perceived belonging, address maladaptive social cognition, or mitigate biological stress responses linked to isolation, while explicitly tracking effects on suicidal ideation, self-harm risk factors, or related clinical endpoints.

The opportunity also highlights service delivery innovation as a key avenue for impact. NIH is looking for research that develops new service models or modifies existing models to strengthen social connection in late life as a suicide prevention strategy. This could involve healthcare systems, community-based aging services, faith-based organizations, public housing settings, telehealth and digital supports, peer or lay navigator programs, or integrated care approaches that connect older adults to social resources. Importantly, the emphasis is on prevention-oriented models that can be implemented in real-world settings, with attention to how programs reach socially disconnected older adults and how services can be adapted to different communities.

This is an R21 mechanism, which generally supports exploratory or developmental research. In that spirit, the funding is geared toward innovative, early-stage, or proof-of-concept projects that can generate strong preliminary evidence, establish feasibility, validate targets or measures, or open up a new line of inquiry. While the posted source data does not specify an award ceiling or the expected number of awards, the intent of the R21 format is typically to enable focused, high-impact studies that can later be scaled or followed by larger, confirmatory research.

Eligibility is broad and includes many types of domestic organizations and governments: state, county, city or township governments; special district governments; independent school districts; public and state-controlled institutions of higher education; private institutions of higher education; federally recognized Native American tribal governments; tribal organizations that are not federally recognized governments; public housing authorities and Indian housing authorities; nonprofits with or without 501(c)(3) status (other than institutions of higher education); for-profit organizations other than small businesses; and small businesses. The announcement also explicitly calls out additional eligible applicant categories, including Alaska Native and Native Hawaiian Serving Institutions; Asian American Native American Pacific Islander Serving Institutions (AANAPISISs); Hispanic-serving Institutions; Historically Black Colleges and Universities (HBCUs); Tribally Controlled Colleges and Universities (TCCUs); faith-based or community-based organizations; eligible federal agencies; regional organizations; U.S. territories or possessions; and non-U.S. entities (foreign organizations). This wide eligibility signals an interest in a diverse range of perspectives and settings, including community and service systems that interact directly with older adults at risk.

Key timeline details provided include a creation date of November 18, 2024, and an original closing date of September 7, 2026. Overall, the opportunity is aimed at advancing practical, mechanism-informed suicide prevention science for older adults by connecting the dots between social isolation, loneliness, biology, environment, and service delivery, and by supporting studies that can translate those insights into targeted interventions and scalable approaches that strengthen social connection in late life.

• The National Institutes of Health in the health sector is offering a public funding opportunity titled "Social disconnection and Suicide Risk in Late Life (R21 Clinical Trial Optional)" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.242.
• This funding opportunity was created on 2024-11-18.
• Applicants must submit their applications by 2026-09-07. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

Apply for PAR 25 066

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