In recent years, the intricate connection between the gut and the brain, known as the gut-brain axis, has become a focal point in neuroscience and mental health research. This fascinating link reveals how the state of our gut can influence our mental well-being, impacting conditions such as anxiety and depression. Flore works on this connection through its data and its personalized probiotic formulations.
Understanding the Gut-Brain Axis
The gut-brain axis refers to the bidirectional communication network that connects the gastrointestinal tract and the central nervous system. This complex system involves multiple pathways, including neural, hormonal, and immune mechanisms. A crucial player in this connection is the microbiome, a vast community of microorganisms residing in our gut.
One of the most significant ways the gut influences the brain is through the production of neurotransmitters. For instance, serotonin, a neurotransmitter that contributes to feelings of happiness and well-being, is predominantly produced in the gut. This discovery has opened new avenues for understanding how gut health can affect mood and mental health.
Serotonin: The Gut's Role in Mental Health
Serotonin is often dubbed the "feel-good" neurotransmitter due to its role in regulating mood, anxiety, and happiness. Surprisingly, about 90% of serotonin is produced in the gut, not the brain. This production highlights the importance of gut health in regulating emotional and psychological states.
Flore's published research includes a 2024 open-label pilot study in autism (mSystems, PMC11097633). In that study of 296 enrolled participants, formulas built from each person's own gut data were associated with increased gut microbiome diversity and reduced GI symptom severity over three months. It was not a randomized controlled trial, and Flore is working toward one in autism.
Challenging Common Assumptions with Real-World Data
While traditional research often relies on in vitro or animal studies, Flore Inc. distinguishes itself by utilizing real-world human outcomes. Flore draws on more than 40,000 personalized formulations to build gut-brain support matched to each person.
This data-driven approach ensures that every formulation is tailored to the individual's unique microbiome, offering a level of personalization that sets Flore apart.
The Flore Neuro Pathway
The Flore Neuro Pathway focuses a personalized formula on the gut-brain connection, to support mood and everyday mental well-being. Flore individually manufactures each formula, drawing from up to 68 curated strains and 40+ prebiotics.
Clinician oversight is available through Flore Clinical, and Flore partners with Evexia Diagnostics.
Quality and Care
Formulations are custom-manufactured in an FDA-registered facility in Joliet, IL.
Probiotics are not a treatment for anxiety, depression or any mental health condition. If you're dealing with one, work with a qualified healthcare provider. A personalized formula is everyday support alongside that care.
Conclusion
The gut-brain axis represents a promising frontier in neuroscience and mental health. Flore builds personalized formulas from real-world data to support the gut-brain connection. The research is still early, and it's moving.
If you want gut-brain support built from your own data, Flore is a place to start.
Frequently Asked Questions
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Q: What is the gut-brain axis?
A: The gut-brain axis is the communication network that links the gastrointestinal tract and the central nervous system, involving neural, hormonal, and immune pathways. -
Q: How does serotonin affect mental health?
A: Serotonin is a neurotransmitter that plays a key role in regulating mood, anxiety, and happiness. A majority of serotonin is produced in the gut, highlighting the importance of gut health for mental well-being. -
Q: What makes Flore Inc.'s approach unique?
A: Flore builds each formula from the person's own gut data, informed by real-world human data, with clinician oversight available through Flore Clinical. -
Q: Can gut health interventions support mental well-being?
A: The research on the gut-brain axis is real and still early. A personalized probiotic can support everyday mood and well-being. It is not a treatment for a mental health condition. -
Q: How does Flore make its formulations?
A: Flore manufactures custom formulations in an FDA-registered facility. Clinician oversight is available through Flore Clinical. -
Q: Do I need to provide a stool sample to get a personalized formulation from Flore?
A: Yes. Flore builds your formula from a gut microbiome test, sequenced by a CLIA-certified partner lab, or from recent results you upload.
Want a probiotic tuned to your ecosystem, not a CFU number?
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Psychobiotics, made personal: neurobiome-directed interventions (NDIs)
This gut–brain science is the foundation of an emerging category we are helping define at Flore — NDIs: precision probiotic interventions matched to your own microbiome for the gut–brain connection. Same biology the research describes; chosen for you rather than for everyone.
Go deeper: see what the neurobiome is — the mood-and-mind slice of your microbiome — and how to map yours with the Neurobiome Test.
Go deeper: most of your body’s serotonin is actually made in your gut — see does the gut produce serotonin? for how gut cells and microbes build this key signaling molecule.
Related: learn what brain fog actually is and what causes it — and where the gut–brain axis genuinely fits in.
Related: your gut has its own nervous system too — see is the gut a second brain? the enteric nervous system, explained.
Related: curious what a test can actually reveal about your gut-brain axis? Read neurobiome testing: how a gut microbiome test reads your gut-brain connection.
Related: Autism and the Gut-Brain Axis.
Feeling the gut–mood connection?
The Bright One (MOOD) is a GoodOnes™ synbiotic built for the gut–brain axis — two targeted strains plus prebiotics to support mood from the gut up.
Meet The Bright One — $49 →
Prefer a formula built from your own gut data? Flore personalizes your probiotic from CLIA-certified lab results →
Not sure where to start with your gut?
Ask the Flore Microbiome Concierge — a guided, personalized walkthrough of testing, your results, and a formula matched to your goals.
Talk to the Concierge →Go deeper on the gut-brain axis and the neurobiome →
Related reading: Does the gut produce GABA? — how gut bacteria make the body’s main calming neurotransmitter — and does the gut produce dopamine?
Related reading: Does gut health affect cortisol? — how the gut microbiome helps regulate the HPA axis behind your main stress hormone.
Go deeper on GoodOnes: Anxiety & the Gut-Brain Axis — The Bright One →