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NIH Exploratory/Developmental Grants Phase II (R33)

Enhancing Mechanistic Research on Precision Probiotic Therapies (R33)

Funds mechanistic work on the host biology that decides who responds to a probiotic and who does not.

OpenNational Institutes of HealthUnited States

Probiotic trials produce inconsistent results, and the usual explanation is that people differ. This notice funds turning that explanation into something measurable.

The goal is precision probiotic therapy: characterising person-specific features that affect probiotic response, so responders can be identified as a subgroup rather than discovered afterwards.

The host features named are wide and c…

Rigorously designed mechanistic studies, in animal models or human subjects, characterising person-specific host features — native microbiome, immune system, gender, diet, age, genetic background, lifestyle and health history — that affect probiotic response, to identify responder subgroups and address the heterogeneity causing inconsistent probiotic outcomes. Clinical trials are optional.

CycleiHow often this grant runs — e.g. annually, on a rolling basis, or a one-off call.Multiple per year
Next deadlineiThe next date applications are due. Rolling means you can apply any time.2 Jun 2027
Decision timeiTypical time from the deadline to the funder's decision.26 weeks
Project durationiHow long the funded work is expected to run.—
Award typeiThe form of funding — grant, equity, loan, tax credit, etc.Grant
Match fundingiThe share of project costs you must cover yourself. 0% = fully funded.—
Funding pooliThe total budget available across all awards in this round.—

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Last verified: 25 Aug 2026Funder reference: PAR-25-210Source: www.grants.gov