Researchers Launched Gut-Brain Health Study
Holobiome and Radicle Science have begun a large-scale clinical trial to study prebiotics.
Updated on Oct. 8, 2026 in Nutrition
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Holobiome and Radicle Science launched the two-year GUT-FEELINGS study, which is funded by the Advanced Research Projects Agency for Health. The trial aims to map the gut-brain axis to identify potential non-prescription prebiotic solutions for mental wellness.
Why it matters
The study seeks to provide scientific evidence for gut-based interventions in mental health by testing food-derived formulas. It represents a significant effort to establish non-prescription wellness alternatives through a decentralized research model.
The study features 19 prebiotic formulas tested in a 20-arm randomized design over 16-week periods per participant. Researchers plan to collect 24,000 fecal samples and 12,000 blood samples to evaluate the gut-brain axis.
The players
Holobiome
A biotechnology company headquartered in Boston, Massachusetts, that focuses on the human microbiome.
Radicle Science
A health-tech company based in San Diego, California, that specializes in conducting large-scale, decentralized clinical trials.
Advanced Research Projects Agency for Health
A United States federal agency within the Department of Health and Human Services that funds high-impact medical research.
The details
This decentralized trial uses a patented Reflexive Trials platform to automate data collection across a national cohort. The program is part of the ARPA-H EVIDENT initiative and operates as a randomized, placebo-controlled study to isolate the impact of different prebiotic interventions.
Timeline
The GUT-FEELINGS study was officially launched on October 8, 2026.
Initial results from the study are expected in the second half of 2027.
The full two-year research initiative is expected to conclude in 2028.
The Big Picture
This study is an official project operating under the ARPA-H EVIDENT initiative to standardize health outcomes research.
The study may eventually lead to new, non-prescription options for managing mental wellness through targeted dietary supplements. Participants and the general public should look for updates in late 2027 to see if these prebiotic formulas demonstrate significant efficacy.
The takeaway
The research highlights an increasing shift toward verifying the effectiveness of dietary interventions for mental health through rigorous, large-scale data collection. Consumers should remain cautious of wellness claims until clinical trial results provide evidence for specific prebiotic formulas.
Further reading
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