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Enhancing Mechanistic Research on Precision Probiotic Therapies (R61/R33 Clinical Trial Optional)

National Institutes of Health · Opportunity number PAR-25-211

View the official notice on Grants.gov
229 days left (deadline Jun 2, 2027)

Details summarized from the official notice as of Oct 15, 2026. Always confirm eligibility, deadlines and requirements in the official notice before applying.

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Key facts

Opportunity numberPAR-25-211
AgencyNational Institutes of Health
Department of Health and Human Services
Assistance listing (ALN, formerly CFDA)93.393, 93.121, 93.213, 93.313, 93.866
PostedOct 31, 2024
DeadlineJun 2, 2027
Cost sharing or matching requiredNo
Funding typeGrant
CategoryEducation
Last updated hereOct 15, 2026

Summary from the notice

The purpose of this notice of funding opportunity (NOFO) is to support highly innovative mechanistic research to accelerate precision probiotic interventions using a milestone-driven, biphasic award mechanism, R61/R33 Phased Innovation Award. Specifically, this NOFO solicits applications that will characterize person-specific features affecting probiotic responses to identify subgroups of probiotic responders and to enhance probiotic clinical outcomes. The ultimate goal of this NOFO is to identify, understand, and develop strategies to address barriers in precision probiotic therapies to account for the heterogenicity in humans that causes inconsistent probiotic responses. The first phase, funded by the R61, will providing for up to 2 years to identify unique host biological patterns (e.g., native microbiome, immune system, gender, diet, age, genetic background, lifestyle, and health history) that are correlated with heterogeneity of probiotic clinical effects using observational or secondary data analysis studies. The second phase, funded under the R33, will support studies to assess the ability of the unique patterns determined in the R61 phase to detect the improvement of probiotic responsiveness in rigorously designed mechanistic studies in relevant animal models or in human subjects. The combined R61/R33 should not exceed 5 years. Transition from the R61 to the R33 phase of the award will be administratively reviewed and will be determined based on successful completion of Transition Milestones that need to be clearly specified in the R61 phase application. Support for a single phased award that does not need the R61 Exploratory phase is available in the companion (R33) NOFO, PAR-AT-24-XXX (TEMP-25413).

Who can apply

The official notice lists these applicant types as eligible:

  • Public and state colleges and universities
  • Other Native American tribal organizations
  • Special district governments
  • Public and Indian housing authorities
  • County governments
  • Others named in the notice (see the eligibility text)
  • Nonprofits with 501(c)(3) status (other than colleges)
  • For-profit organizations other than small businesses
  • City or township governments
  • Federally recognized tribal governments
  • State governments
  • Private colleges and universities
  • Independent school districts
  • Nonprofits without 501(c)(3) status (other than colleges)
  • Small businesses

Who should take a closer look

  • Small businesses
  • Nonprofits
  • Colleges and universities
  • State governments
  • Local governments
  • Tribal governments and organizations
  • Larger for-profit companies

Not listed as eligible

  • Individuals

Unless the eligibility text in the notice names you, this opportunity is probably not for you.

Eligibility details from the notice

Other Eligible Applicants include the following: Alaska Native and Native Hawaiian Serving Institutions; Asian American Native American Pacific Islander Serving Institutions (AANAPISISs); Eligible Agencies of the Federal Government; Faith-based or Community-based Organizations; Hispanic-serving Institutions; Historically Black Colleges and Universities (HBCUs); Indian/Native American Tribal Governments (Other than Federally Recognized); Non-domestic (non-U.S.) Entities (Foreign Organizations); Regional Organizations; Tribally Controlled Colleges and Universities (TCCUs) ; U.S. Territory or Possession; Non-domestic (non-U.S.) Entities (Foreign Organizations) are not eligible to apply. Non-domestic (non-U.S.) components of U.S. Organizations are not eligible to apply. Foreign components, as defined in the NIH Grants Policy Statement, are allowed.

Registrations you will likely need

Most applications submitted through Grants.gov need the following. Registration can take several weeks, so start early. The notice lists the exact requirements.

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