New Clinical Study Has Targeted Gut-Brain Axis
Researchers have begun a nationwide study testing food-derived prebiotic formulas to support mental wellness.
Updated on Oct. 9, 2026 in Nutrition
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Holobiome and Radicle Science have launched the GUT-FEELINGS study, a two-year decentralized initiative funded by the Advanced Research Projects Agency for Health. This trial aims to map the gut-brain axis by testing 19 prebiotic formulas in over 6,000 American participants.
Why it matters
The study seeks to identify non-prescription options for mental health support, addressing a critical need for evidence-based nutritional interventions. By mapping biological pathways, researchers hope to determine how specific gut microbes influence emotional well-being.
This 20-arm randomized trial involves 6,000 Americans, with each participant undergoing a 16-week regimen. Researchers are collecting 24,000 fecal and 12,000 blood samples to analyze, though the specific clinical efficacy of the formulas is still being tested.
The players
Holobiome
A biotechnology company focused on developing microbiome-based therapeutics for various health conditions.
Radicle Science
A health-tech firm that conducts large-scale clinical trials on supplements and natural health products.
Advanced Research Projects Agency for Health
A U.S. federal agency that funds high-risk, high-reward biomedical research to accelerate health breakthroughs.
The details
The study utilizes the Reflexive Trials platform to automate data collection across a decentralized cohort. By analyzing fecal and blood samples alongside participant outcomes, the researchers aim to identify how 19 distinct, food-derived prebiotic formulas interact with the microbiome. The goal is to establish a clearer understanding of the gut-brain axis, specifically how microbial metabolites may influence neurological health and mood regulation.
Timeline
October 8, 2026: The GUT-FEELINGS study was officially launched.
Second half of 2027: Initial study results are expected to be released.
2028: The full two-year research initiative is expected to conclude.
Health Landscape
This study aligns with the ARPA-H EVIDENT initiative, which prioritizes large-scale, decentralized research to validate natural health interventions. It represents a shift toward mapping the gut-brain axis with the same rigor typically reserved for pharmaceutical drug development.
For now, this study is in the initial phases of data collection, and it is not a signal to change your current diet or supplement use. It is always a good idea to discuss your mental health and nutritional needs with your physician before adding new prebiotics or other supplements to your routine.
The takeaway
The GUT-FEELINGS study is working to bridge the gap between nutritional intake and mental health outcomes. Interested readers can monitor official announcements from the research team in 2027 to see if specific prebiotic trends emerge from the data.
Further reading
Learn more about the current understanding of gut health in our Nutrition section.
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