Stress and the gut are closely linked through a two-way communication network that can influence digestion, stool patterns, and abdominal comfort. This article explores how stress contributes to common bowel symptoms, what triggers them, why people respond differently, and how understanding your gut microbiome can provide clearer insight. If you’ve noticed that digestive issues flare during stressful periods, this guide will help you recognize patterns, evaluate your options, and take informed next steps toward relief.
## Stress and the Gut: Symptoms, Triggers, and Relief (Stress-Related Bowel Problems)
### What “stress-related bowel problems” can look like
Stress-related bowel problems often present as a cluster of symptoms that appear or worsen during periods of psychological or physical strain. Common experiences include sudden diarrhea or urgency, constipation that feels stubborn and slow, abdominal cramping, bloating, or a sense of incomplete evacuation. These symptoms may come and go based on your stress levels, and they frequently overlap with conditions like irritable bowel syndrome (IBS). The key pattern is that the gut reacts when stress rises, and it may settle when stress subsides—though this is not always immediate.
### Why this guide focuses on clues, uncertainty, and next steps
This guide emphasizes clues rather than definitive answers because stress-related bowel problems vary widely from person to person. Two individuals facing the same deadline may develop completely different symptoms—one experiences loose stools, the other feels bloated and constipated. This variability means that guessing at remedies without understanding your personal patterns often leads to frustration. The goal here is to help you identify signals, recognize uncertainty, and decide which next steps—including lifestyle changes, symptom tracking, or deeper testing—are most relevant for your situation.
## How Stress Affects the Gut (Core Explanation)
### The gut–brain axis: communication between stress and digestion
The gut and brain are connected through a complex network known as the gut–brain axis. This involves the vagus nerve, neurotransmitters like serotonin, and hormonal signals that travel between the central nervous system and the enteric nervous system in your gut. When you experience stress, your brain sends signals that can alter gut motility, increase or decrease digestive secretions, and heighten sensitivity to normal sensations. This communication happens in both directions, meaning an upset gut can also send distress signals back to the brain.
### Stress pathways that change motility, secretion, and sensitivity
Stress activates the sympathetic nervous system and the hypothalamic-pituitary-adrenal (HPA) axis. These pathways release hormones like cortisol and adrenaline, which can speed up or slow down gut transit depending on the individual. Secretions of digestive enzymes and mucus may also change, and the gut’s pain-sensing nerve endings become more reactive. This means that normal gas or movement can feel painful during stress, and bowel habits may shift from baseline patterns.
### Why the same stressor can affect people differently
Individual differences in genetics, microbiome composition, past experiences, and baseline gut function determine how your body responds to stress. Some people have a naturally more reactive gut (visceral hypersensitivity), while others experience motility changes first. Prior infections, antibiotic use, or dietary habits can also shape how your gut reacts. This is why your friend might get diarrhea during exams, while you experience constipation—both are valid stress-related responses.
### Short-term vs. chronic stress: different gut effects
Short-term stress, like a public speaking event, often triggers a temporary surge in gut motility and secretion, which may cause urgency or loose stools. Chronic stress, on the other hand, can alter baseline gut function over weeks or months. It may reduce blood flow to the digestive tract, disrupt the gut barrier, and promote low-grade inflammation. These sustained changes can shift stool patterns toward constipation or diarrhea-predominant syndromes and make the gut more vulnerable to flare-ups.
## Why This Matters for Gut Health
### Stress can worsen existing GI conditions
If you already have a digestive condition such as IBS, inflammatory bowel disease, or gastroesophageal reflux, stress can amplify symptoms. Stress does not cause these conditions, but it can worsen inflammation, disrupt motility, and lower the threshold for discomfort. Managing stress is often a key component of treatment plans for chronic gut issues.
### The cycle of symptoms → anxiety → more symptoms
Gut symptoms can create anxiety about when the next flare will occur, which in turn triggers more stress and worsens digestive function. This feedback loop is common and can make it difficult to distinguish whether stress or the gut issue came first. Breaking this cycle often requires addressing both the physical symptoms and the emotional response to them.
### Inflammation, immunity, and gut barrier function link to stress
Chronic stress can increase intestinal permeability—often called “leaky gut”—through changes in tight junction proteins and immune cell activity. This may allow bacterial fragments or food particles to cross into the bloodstream, activating immune responses. Over time, this contributes to low-grade inflammation that affects digestion and overall health.
### When “functional” symptoms may still reflect biology
Functional symptoms like bloating, gas, and altered bowel habits do not show up on standard medical imaging or blood tests, but they are biologically real. They reflect changes in nerve sensitivity, motility, and gut environment that are mediated by stress and other factors. Recognizing this helps validate your experience and opens the door to addressing root causes rather than dismissing symptoms as “all in your head.”
## Common Symptoms and Signals of Stress-Related Bowel Problems
### Diarrhea, urgency, and frequent stools during stressful periods
Stress can speed up intestinal transit, reducing the time for water absorption and resulting in loose, urgent stools. This is especially common during acute stress events, like job interviews or exams. If this happens repeatedly, it may be useful to explore whether other factors—diet, infection history, or microbiome changes—are also contributing.
### Constipation, straining, and slowed transit with stress
In contrast, some people experience slowed gut motility during stress. This occurs when the sympathetic nervous system reduces digestive activity, leading to harder stools, straining, and infrequent bowel movements. Chronic stress may also reduce the frequency of the natural motility waves that move stool through the colon.
### Abdominal pain, cramps, bloating, and discomfort
Stress can lower your threshold for feeling pain and discomfort in the gut. Normal amounts of gas or stool can cause cramping or sharp pains during stressful periods. Bloating may also appear, especially if stress alters fermentation patterns in the colon.
### Bloating patterns that track stress timing
If your bloating predictably worsens during stressful weeks and resolves during calm periods, it suggests a stress-gut link. Bloating arises from gas production and slowed gas transit, both of which can be influenced by stress-induced changes in motility and microbial activity.
### Changes in stool appearance (e.g., Bristol stool pattern shifts)
Tracking stool form using the Bristol Stool Scale can help you notice shifts toward hard pellets, lumpy stools, or liquid stools during stress. These patterns provide useful data for understanding whether your bowel changes are primarily constipation-predominant, diarrhea-predominant, or mixed.
### Associated symptoms (fatigue, sleep disruption, nausea)
Gut symptoms during stress rarely occur in isolation. You may also experience fatigue, trouble sleeping, nausea, or loss of appetite. These associated symptoms can provide additional clues about the broader impact of stress on your body.
## Triggers: What Usually Sets Stress-Related Gut Symptoms in Motion
### Emotional stress vs. physical stress (illness, overtraining)
Both psychological stressors—deadlines, conflict, worry—and physical stressors like illness, overtraining, or sleep deprivation can activate the same stress pathways. Physical stress may have a stronger effect on the gut because it directly impacts immune function and energy demands. Recognizing both types can help you identify patterns.
### Major life events, deadlines, and anticipatory anxiety
Big life changes—moving, starting a new job, relationship stress—are common triggers. Even the anticipation of an upcoming stressful event can activate the HPA axis and trigger gut symptoms before the event occurs. This is why some people feel digestive distress days before a known stressor.
### Sleep loss, circadian disruption, and stress gut flare-ups
Poor sleep disrupts circadian rhythms that regulate digestion and microbial activity. Sleep deprivation also elevates cortisol, which can worsen gut symptoms. A single night of poor sleep may be enough to trigger a flare in sensitive individuals.
### Dietary triggers that interact with stress (caffeine, alcohol, high FODMAP foods)
Stress often changes what we eat—more caffeine, alcohol, sugary or processed foods—and these can independently irritate the gut. Caffeine speeds motility, alcohol disrupts the gut barrier, and high-FODMAP foods cause gas in susceptible people. The combination of stress and these dietary triggers can amplify symptoms.
### Medications that can mimic or amplify stress-related changes
Medications like antibiotics, NSAIDs, laxatives, or even some antidepressants can cause digestive changes that overlap with stress-related symptoms. If you start a new medication and notice bowel changes, it is worth discussing with your clinician.
### Hormonal shifts and stress sensitivity (where relevant)
Hormonal changes during the menstrual cycle, pregnancy, or menopause can affect stress responsiveness and gut function. For example, some women experience worsening of IBS symptoms during certain phases of their cycle, especially when combined with stress.
## Individual Variability: Why Two People Can Have Different Gut Responses
### Genetic factors and baseline GI function
Variations in genes involved in serotonin signaling, immune regulation, and gut motility influence how your gut responds to stress. These differences are present from birth and shape your baseline digestive function.
### Past exposures and prior microbiome development
Childhood antibiotic use, diet, infections, and even mode of birth contribute to your unique microbiome composition. These past exposures influence how your gut reacts to stress later in life. A microbiome that developed under different conditions may be more or less resilient.
### Different stress reactivity styles (gut sensitivity vs. motility changes)
Some people primarily experience changes in gut sensation (feeling pain or bloating), while others experience changes in motility (diarrhea or constipation). Your dominant response style matters for choosing the right interventions.
### Co-existing conditions (IBS overlap, lactose intolerance, etc.)
Many people have more than one gut issue at a time. Lactose intolerance, gluten sensitivity, or small intestinal bacterial overgrowth (SIBO) can coexist with stress-related bowel problems, making it harder to pinpoint the main driver. Clarifying these overlapping conditions often requires professional evaluation.
### Recovery capacity: what “settles down” vs. what persists
Some people recover quickly once stress resolves; others experience lingering symptoms for weeks. Recovery capacity depends on your overall resilience, diet, sleep, and the health of your gut barrier and microbiome.
## Why Symptoms Alone Don’t Reveal the Root Cause
### Symptom overlap across multiple gut conditions
Diarrhea, constipation, bloating, and pain are common to many gut issues—IBS, food intolerances, inflammatory bowel disease, infections, and stress-related changes all present similarly. Symptoms alone rarely tell you which process is most active.
### Stress is a contributor—not always the only driver
Even when stress clearly triggers symptoms, other factors like diet, medications, microbiome shifts, or infections may also be involved. Focusing only on stress management may not resolve symptoms if hidden imbalances remain unaddressed.
### Red flags that require medical evaluation (general guidance)
Blood in stools, unintended weight loss, fever, persistent nighttime symptoms, or severe pain warrant prompt medical evaluation. These signs suggest conditions beyond functional stress-related changes and require professional diagnosis.
### Limitations of “trial-and-error” without data
Guessing at dietary changes, supplements, or probiotics without understanding your baseline can lead to wasted effort and frustration. Without data, it is hard to know whether any change is truly helping or just coincidental.
### How to think diagnostically without self-diagnosing
The best approach is to treat symptoms as signals to investigate further, not as final diagnoses. Tracking patterns, ruling out red flags, and gathering objective data—including microbiome testing—can help you build a clearer picture to discuss with your clinician.
## The Role of the Gut Microbiome in Stress and Bowel Symptoms
### What the gut microbiome does for digestion, barrier function, and signaling
Your gut microbiome is a community of trillions of microorganisms that break down fiber, produce vitamins, train your immune system, and communicate with your brain through metabolic signals. A healthy microbiome supports strong gut barrier integrity and normal motility.
### How stress can influence microbiome composition and activity
Chronic stress can alter the composition of your microbiome, reducing beneficial bacteria and increasing potentially inflammatory species. Stress hormones and immune changes also affect microbial metabolism, which can shift the types and amounts of gases produced in the colon.
### Stress-driven changes in diet, sleep, and gut environment
When stressed, people often eat differently—more sugar, less fiber—which directly alters what bacteria can thrive. Sleep disruption and reduced blood flow to the gut also create an environment that favors certain microbes over others.
### Microbiome–immune interactions relevant to bowel symptoms
Your microbiome helps train your immune system to tolerate harmless substances versus reacting to threats. Stress-related microbiome changes can lead to low-grade immune activation, which may contribute to abdominal pain, bloating, and altered stool patterns.
### Why dysbiosis may affect sensitivity to stress
Dysbiosis—an imbalance in the microbial community—can increase gut permeability and heighten nerve sensitivity. This makes your gut more reactive to stress and may explain why some people develop severe symptoms even with minor stress.
## How Gut Microbiome Imbalances May Contribute to Stress-Related Bowel Problems
### “Imbalance” defined: diversity, resilience, and functional capacity
Imbalance does not simply mean “bad bacteria” versus “good bacteria.” It can refer to lower overall diversity, reduced resilience to perturbations, or loss of key functional capacities like butyrate production or mucus regulation. These functional changes matter more than any single species.
### Potential links to diarrhea-predominant patterns
Certain microbial patterns—such as reduced short-chain fatty acid producers or increased pathogens—can accelerate transit and reduce water absorption, contributing to loose stools. Stress may worsen these patterns by altering the gut environment.
### Potential links to constipation-predominant patterns
Low microbial diversity, reduced methane-producing archaea, or fewer fiber-fermenting bacteria can slow transit. Stress-related changes may further consolidate these patterns by reducing motility-enhancing signals.
### Bloating and gas: fermentation patterns and microbial byproducts
Bloating often results from rapid or excessive fermentation of undigested carbohydrates. Stress can shift the types of carbohydrates that reach the colon and alter the microbial groups that break them down, leading to more gas production and discomfort.
### Reduced short-chain fatty acid (SCFA) support and gut barrier signaling (conceptual)
SCFAs like butyrate are essential for nourishing colon cells and maintaining a strong gut barrier. When stress-related changes reduce SCFA-producing bacteria, barrier integrity may weaken, making the gut more sensitive and prone to symptoms.
### Inflammation-related microbial changes (conceptual)
Some microbial species produce inflammatory molecules like lipopolysaccharides, which can activate immune responses. Stress-related dysbiosis can increase these inflammatory signals, contributing to gut discomfort and systemic effects.
## How Gut Microbiome Testing Provides Insight (Decision-Oriented)
### Testing vs. guessing: why microbiome data can narrow uncertainty
Without data, managing stress-related bowel problems involves broad guesses about diet, probiotics, or fiber strategies. Microbiome testing provides a baseline view of your microbial community, allowing you to make more targeted decisions rather than relying on trial and error. For example, a gut microbiome test can identify whether your microbiome shows patterns linked to slower transit, gas production, or reduced SCFA potential.
### What microbiome testing is designed to measure
Microbiome testing measures the relative abundance of different bacterial groups, overall diversity, and sometimes functional markers related to metabolism or inflammation. It provides a snapshot of your gut ecosystem at a given point in time.
### When a test can support hypothesis-building
If you notice that your bloating correlates with stress and you suspect your microbiome is involved, a test can help you explore whether low diversity, reduced butyrate producers, or specific imbalances are present. This information can guide dietary and lifestyle changes.
### When a test may not be the most efficient next step
If you have not yet tracked your symptoms, addressed sleep or stress basics, or ruled out obvious dietary triggers, testing may add more information than you can act on. In those cases, starting with simple symptom tracking is often more practical.
## What a Microbiome Test Can Reveal in This Context
### Relative abundance vs. “functional potential” (what to understand before interpreting)
Relative abundance tells you what proportion of your microbiome belongs to each bacterial group, but it does not directly measure activity. Some labs also estimate functional potential based on known metabolic abilities of detected species.
### Diversity and stability signals
Higher diversity is generally associated with better resilience to stress and diet changes. Lower diversity may indicate a less adaptable microbiome that is more vulnerable to disruptions.
### Indicators that may correlate with fermentation, gas production, or stool pattern changes
Certain bacterial groups produce more hydrogen, methane, or hydrogen sulfide gas. Their abundance can offer clues about whether excessive gas production or altered transit patterns are part of your picture.
### Community signatures associated with constipation vs. diarrhea (general framing)
Some studies suggest that constipation-predominant patterns may be associated with higher levels of methane-producers, while diarrhea-predominant patterns may involve different community structures. These are population-level trends, not strict diagnostic markers.
### Signs of imbalance that could be influenced by stress-related habits
Low abundance of butyrate producers, high levels of potentially inflammatory bacteria, or reduced diversity can all reflect the impact of stress-related habits like poor sleep, irregular eating, or high sugar intake.
### Useful outputs for next-step planning (dietary fiber mapping, probiotic/supplement considerations)
Test results can suggest which types of fiber your microbiome is best equipped to process, and whether probiotics targeting specific functions—such as soothing inflammation or improving barrier function—may be worth considering. For those interested in monitoring changes over time, a gut microbiome test subscription and longitudinal testing can provide ongoing insight into how your microbiome responds to interventions.
## Who Should Consider Microbiome Testing?
### Ongoing stress-related bowel problems despite lifestyle changes
If you have already improved sleep, added movement, and reduced known triggers but still experience gut symptoms, testing may reveal underlying imbalances that lifestyle alone has not addressed.
### Persistent symptoms after a period of improved stress management
If your stress levels have decreased but gut symptoms remain, it suggests that other factors—like microbiome shifts or dietary patterns—may be perpetuating the issue.
### Frequent flares with unclear triggers
When you cannot pinpoint what sets off symptoms, testing can help you see whether microbial patterns correlate with flare times.
### High uncertainty: multiple suspected causes (diet, stress, meds, infections)
When diet, stress, medications, and past infections could all be contributing, testing provides one more piece of data to help differentiate between them.
### People who want a more personalized approach to gut relief
If you are tired of generic advice and want a plan tailored to your gut community, testing offers a starting point for personalization.
### Situations where testing can complement clinician-led evaluation
Testing is not a replacement for medical diagnosis, but it can provide additional information that your doctor or dietitian can use to refine recommendations.
## When Testing Makes Sense (Decision-Support Section)
### Your symptom pattern matches “gut–stress coupling” (timing and flare logic)
If your symptoms reliably worsen before or during known stressors and improve during calm periods, testing can help you understand the microbial component of this coupling.
### You’re willing to act on results (diet, fiber strategy, targeted interventions)
Testing is most valuable when you are ready to make changes based on the data. Without action, it remains just information.
### You can pair microbiome testing with symptom tracking (stool diary, trigger log)
The combination of test data and symptom logs is far more powerful than either alone. Testing gives you biological context for your experiences.
### You have already ruled out common medical red flags and serious causes
Before testing, ensure that serious conditions have been evaluated by a healthcare provider. Testing is for functional insight, not diagnostic screening.
### You understand testing is one input, not a final diagnosis
Testing provides a hypothesis-generating snapshot, not a definitive label. It is best used to inform conversations with professionals rather than to replace them.
### How to discuss results with a clinician or dietitian for safer interpretation
Bring your test report along with symptom logs to a clinician or dietitian experienced in gut health. They can help you determine which findings are relevant and which may not warrant concern. For clinicians interested in offering such insights to their clients, a B2B gut microbiome platform may support integration into practice.
## Practical Path From Stress Relief to Gut Improvement (Grounded, Non-Promotional)
### First steps: symptom tracking to establish patterns
Use a simple diary to record stool form (Bristol scale), symptom severity, timing, and stress levels each day. After two to three weeks, you may notice clear patterns linking stress to specific gut changes.
### Lifestyle factors that influence microbiome outcomes (sleep, stress tools, movement)
Prioritize consistent sleep, stress-reduction practices like breathwork or walking, and regular movement—all of which support a more resilient microbiome and less reactive gut.
### Nutrition basics that often matter for both stress and the microbiome (fiber sources, meal timing)
Eat a variety of fiber sources (fruits, vegetables, legumes, whole grains) to feed diverse bacteria. Regular meal timing can also support digestive rhythm. Reduce caffeine and alcohol when symptoms are active.
### Reducing “confounders” before making microbiome-related changes
Before changing diet or supplements based on testing, stabilize your sleep, stress, and movement patterns. This helps ensure that later changes have a clear effect.
### Pairing targeted food choices with stress management strategies
If testing indicates low butyrate producers, you might increase cooked legumes and cooked starches. If gas production is high, working with a professional to identify fermentable triggers may help.
### When to escalate care: persistent symptoms or concerning features
If symptoms persist despite consistent lifestyle changes, or if red flags appear, seek medical evaluation. Functional tests like microbiome analysis are complements to, not substitutes for, medical care.
## Conclusion: Use Stress-Related Bowel Problems to Understand Your Personal Gut Microbiome
### Connect the dots—symptoms, uncertainty, microbiome testing relevance
Stress-related bowel problems are not just about managing stress; they are also clues about your personal gut ecosystem. Symptoms point to a deeper interaction between your nervous system and microbial community.
### How individualized microbiome insights can guide a more precise plan
A one-size-fits-all approach rarely works for stress-related gut issues. By understanding your unique microbiome patterns, you can choose strategies that address your specific imbalances rather than guessing at solutions.
### Next steps to take (tracking + clinician conversation + testing when appropriate)
Start by tracking your symptoms for two weeks. Review patterns and consider a conversation with a healthcare professional. If uncertainty remains, microbiome testing can provide the missing context to move from managing symptoms to understanding your gut.
## Key Takeaways
- Stress-related bowel problems result from communication between the gut and brain via the gut–brain axis, affecting motility, sensitivity, and secretions.
- Symptoms vary widely—diarrhea, constipation, bloating, and pain can all appear, depending on individual biology and stress reactivity.
- Chronic stress can alter the gut microbiome, reduce diversity, and weaken barrier function, contributing to persistent symptoms.
- Symptoms alone rarely reveal the root cause; dietary, microbial, and lifestyle factors often overlap.
- Gut microbiome testing offers a snapshot of your microbial community, helping you move from guessing to personalized insight.
- Testing is most useful when paired with symptom tracking and when you are ready to act on results.
- Lifestyle basics—sleep, movement, stress management—should come before dietary or microbial interventions.
- No test replaces medical evaluation; testing should be used to inform conversations with clinicians or dietitians.
- Individual variability means your path to relief may look very different from someone else’s.
- Understanding your microbiome is a step toward connecting gut symptoms to their deeper biological context.
## Frequently Asked Questions
**1. Can stress cause long-term damage to my gut?**
Chronic stress can alter gut permeability, immune activation, and microbiome composition over time, but the gut is generally resilient. With proper stress management, diet, and sleep, many stress-related changes can improve.
**2. How do I know if my bowel problems are from stress or something else?**
Tracking symptom timing in relation to stress periods is a helpful first step. If symptoms consistently appear during stress and resolve when calm, stress is likely a major contributor. However, other factors like diet or infections can co-occur.
**3. Is it normal to have diarrhea every time I feel anxious?**
Yes, many people experience “anxiety diarrhea” due to accelerated gut motility triggered by the stress response. If it happens regularly, it may be worth investigating whether your microbiome or diet also play roles.
**4. Can constipation really be caused by stress?**
Absolutely. Some people experience slowed gut motility under stress, leading to harder, less frequent stools. The fight-or-flight response reduces digestive activity, which can result in constipation.
**5. How quickly can the gut microbiome change with stress?**
Some microbial changes can occur within days of a major stressor, especially if it disrupts your sleep or diet. However, a stable shift usually requires ongoing exposure or lifestyle changes.
**6. Will taking probiotics help stress-related gut symptoms?**
Probiotics may help some people, but the effects are strain-specific and variable. Without knowing your baseline microbiome, it is often a guess. Testing can help identify whether specific probiotic strains are likely to be beneficial.
**7. Should I cut out certain foods when I’m stressed to help my gut?**
Reducing caffeine, alcohol, and high-FODMAP foods during acute stress can help, but eliminating entire food groups long-term is not usually necessary. A low-FODMAP diet should ideally be done with professional supervision.
**8. Can gut microbiome testing tell me if I have IBS or SIBO?**
No. Microbiome testing is not designed to diagnose conditions like IBS or SIBO. It provides information about your microbial community, which can offer supportive context, but clinical diagnosis requires medical evaluation.
**9. How often should I do microbiome testing to track progress?**
If you are making significant changes to diet or lifestyle, a repeat test every 6–12 months can show whether your microbiome is moving in a more resilient direction. More frequent testing is rarely necessary.
**10. Is it safe to use microbiome test results to choose supplements on my own?**
It is safer to discuss results with a clinician or dietitian who can interpret them in context. Self-prescribing supplements based on test data can lead to inappropriate choices or interactions.
**11. Can improving my gut microbiome reduce my stress reactivity?**
Possibly. Since the gut and brain communicate in both directions, supporting a healthy microbiome through diet, sleep, and stress management may help reduce overall stress reactivity for some individuals.
**12. What is the first step I should take if I suspect stress-related bowel issues?**
Start with symptom tracking for two weeks. Note stool form, timing, stress levels, and food intake. This data is invaluable for identifying patterns and discussing next steps with a professional.
## Relevant Keywords
stress-related bowel problems, gut-brain axis, stress and digestion, stress and gut health, gut microbiome, microbiome imbalance, stress and IBS, stress diarrhea, anxiety constipation, bloating and stress, gut microbiome testing, personalized gut health, functional gut symptoms, gut barrier function, stress-related bloating, cortisol and digestion, gut motility, microbial diversity, butyrate and gut health, SCFA production, gut microbiome analysis, symptom tracking, visceral hypersensitivity, IBS triggers, gut health subscription, B2B microbiome platform.