Faecalibacterium prausnitzii: A Key Gut Species in Ulcerative Colitis

    innerbuddies gut microbiome testing

    Key Gut Species: Bacterial Strains Commonly Found in the Gut

    What Is Faecalibacterium prausnitzii?

    Faecalibacterium prausnitzii is a Gram-positive, anaerobic bacterium that lives mainly in the colon. It is one of the most abundant bacterial species in a healthy gut microbiome and belongs to the Firmicutes phylum. It is best known for producing butyrate, a short-chain fatty acid that supports the intestinal lining.

    Although F. prausnitzii is less well known than bifidobacteria or lactobacilli, it is considered a key gut species because of its consistent presence in healthy people and its frequent depletion in people with inflammatory bowel conditions.

    Why Butyrate Matters for the Gut

    Butyrate is a primary energy source for colon cells. It helps maintain the gut barrier, supports normal immune responses and has anti-inflammatory effects. Because F. prausnitzii is a major butyrate producer, low levels may reduce the gut's ability to keep inflammation in check.

    What Is Ulcerative Colitis?

    Ulcerative colitis is a chronic inflammatory bowel disease that affects the colon and rectum. It causes inflammation and ulcers in the lining of the large intestine, leading to symptoms such as diarrhea, abdominal pain, cramping, urgency and sometimes rectal bleeding. Symptoms can flare and then improve over time.

    How the Gut Microbiome Relates to Ulcerative Colitis

    In ulcerative colitis, the gut microbial community is often less diverse, and beneficial bacteria such as F. prausnitzii tend to be less abundant. This imbalance, sometimes called dysbiosis, is associated with intestinal inflammation. Whether low F. prausnitzii is a cause or a consequence of ulcerative colitis is still not fully clear, but research suggests the connection is meaningful.

    Order a test! Order annual subscription with 2 or 3 tests!
    2-minute self-check Is a gut microbiome test useful for you? Answer a few quick questions and find out if a microbiome test is actually useful for you. ✔ Takes 2 minutes ✔ Based on your symptoms & lifestyle ✔ Clear yes/no recommendation Check if a test is right for me
    innerbuddies gut microbiome testing

    How F. prausnitzii Supports Gut Health

    F. prausnitzii does more than occupy space in the colon. Its metabolic activity influences inflammation, the gut barrier and the wider microbial community.

    Butyrate Production and Colon Protection

    When F. prausnitzii ferments dietary fibre and resistant starch, it produces butyrate. Butyrate provides fuel for colonocytes, supports mucus production and helps maintain the integrity of the intestinal barrier. In animal models, butyrate has been associated with reduced intestinal inflammation, although results in humans are more varied.

    Anti-Inflammatory Effects

    F. prausnitzii also produces metabolites that can dampen inflammation. Research has identified a microbial anti-inflammatory molecule, sometimes called MAM, which may reduce inflammatory signalling in intestinal cells. These effects may help balance the immune response, but they do not prove that F. prausnitzii alone can control ulcerative colitis.

    Interactions With Other Gut Bacteria

    F. prausnitzii works with other bacteria through cross-feeding. Some species produce acetate, and F. prausnitzii uses that acetate to make butyrate. This cooperation supports a more resilient gut ecosystem. When the microbial community is disrupted by antibiotics, diet changes or inflammation, F. prausnitzii can decline along with the species that feed it.

    Bifidobacterium breve Benefits: What Research Shows Bifidobacterium adolescentis: Role, Benefits & How to Increase It
    innerbuddies gut microbiome testing

    Key Gut Species: Bacterial Strains Commonly Found in the Gut

    F. prausnitzii and Ulcerative Colitis: What Research Shows

    Research has repeatedly associated lower levels of F. prausnitzii with ulcerative colitis and other inflammatory conditions. Studies using stool samples and gut microbiome testing have found that people with active ulcerative colitis often have reduced abundance of this species compared with healthy controls.

    What Does a Low F. prausnitzii Level Mean?

    A low F. prausnitzii level is a signal, not a diagnosis. It may indicate reduced butyrate production and less anti-inflammatory support in the gut. Low levels have been linked with active ulcerative colitis, but they can also occur after antibiotic use, with certain diets or in people without gut symptoms. A gut microbiome test can show the relative abundance of F. prausnitzii, but results should be interpreted by a healthcare professional who understands your full picture.

    Could F. prausnitzii Be a Biomarker?

    Because F. prausnitzii tends to be lower when ulcerative colitis is active, researchers are investigating whether it could help monitor disease activity or predict relapse. The evidence is promising but not yet strong enough for routine clinical use. It is best considered one piece of a broader assessment.

    What This Means for Ulcerative Colitis Management

    Restoring a healthier gut microbiome may complement ulcerative colitis treatment, but it should not replace prescribed medication. Conventional treatments, dietary adjustments and microbiome support each play different roles, and any changes should be discussed with a gastroenterologist.

    Order a test! Order annual subscription with 2 or 3 tests!
    2-minute self-check Is a gut microbiome test useful for you? Answer a few quick questions and find out if a microbiome test is actually useful for you. ✔ Takes 2 minutes ✔ Based on your symptoms & lifestyle ✔ Clear yes/no recommendation Check if a test is right for me
    innerbuddies gut microbiome testing

    How to Support Healthy F. prausnitzii Levels

    There is no single F. prausnitzii supplement that has been proven to restore levels in everyone with ulcerative colitis. The most practical approach is to support the gut ecosystem in which this bacterium thrives.

    Diet and Prebiotics

    A diet rich in plant fibres gives butyrate-producing bacteria more to ferment. Foods that may support the microbiome include vegetables, fruits, legumes, whole grains, onions, garlic and leeks. Prebiotic fibres such as inulin, fructooligosaccharides and resistant starch can also feed beneficial bacteria, although they may cause bloating.

    • Eat a wide range of plant foods rather than focusing on one superfood.
    • Introduce fibre gradually, especially during an inflammatory bowel disease flare.
    • Limit ultra-processed foods, excess sugar and very high-fat meals.
    • Include polyphenol-rich foods such as berries, green tea and olive oil.

    Probiotics and Emerging F. prausnitzii Therapies

    Most commercial probiotics do not contain live F. prausnitzii because the bacterium is very sensitive to oxygen and difficult to manufacture. Some probiotics may indirectly support butyrate producers, but they should not be assumed to raise F. prausnitzii specifically. Researchers are exploring live biotherapeutic products and fecal microbiota transplantation as ways to rebuild the gut microbiome, but these approaches are not yet standard treatments.

    Lifestyle and Antibiotic Stewardship

    The gut microbiome is influenced by more than diet. Sleep, stress and physical activity all affect microbial balance. Antibiotics can temporarily reduce F. prausnitzii and other anaerobes, so they should be used only when medically necessary.

    Bifidobacterium breve Benefits: What Research Shows Bifidobacterium adolescentis: Role, Benefits & How to Increase It
    innerbuddies gut microbiome testing

    F. prausnitzii Compared With Other Butyrate-Producing Bacteria

    F. prausnitzii is not the only butyrate producer in the gut, but it is one of the most abundant. Other species also contribute to short-chain fatty acid production:

    • Roseburia species are common butyrate producers that have also been found at lower levels in inflammatory bowel disease.
    • Eubacterium rectale is a prevalent butyrate producer linked with fibre fermentation.
    • Anaerostipes and Coprococcus species can produce butyrate and are part of a healthy microbial community.

    For gut health, the overall production of butyrate and the diversity of the community may matter more than the abundance of any single species. Still, F. prausnitzii often attracts attention because of how consistently it appears in microbiome research on ulcerative colitis.

    Future Research Directions

    Ongoing research is focused on how to restore F. prausnitzii in people with ulcerative colitis. Areas of interest include oxygen-tolerant strains for probiotic production, encapsulation methods, personalised diet plans and microbiome-based biomarkers. More clinical trials are needed before these approaches become routine.

    The Bottom Line

    Faecalibacterium prausnitzii is a key gut species that supports the intestinal barrier and helps keep inflammation in check. Its low levels in ulcerative colitis make it an important focus of microbiome research. Supporting the gut microbiome with a varied plant-based diet, lifestyle changes and responsible supplement use may help, but it cannot replace medical treatment. If you are living with ulcerative colitis, talk to your gastroenterologist before making significant changes to your diet or supplement routine.

    Frequently Asked Questions

    Can I Buy Faecalibacterium prausnitzii as a Probiotic?

    Live F. prausnitzii is not widely available in over-the-counter probiotic supplements because it is difficult to grow and keep stable. Most products do not contain this species. Products using related strains or postbiotic ingredients may not have the same effects as the live bacterium.

    What Supplements Should Be Avoided With Ulcerative Colitis?

    There is no universal list of supplements to avoid. Some people with ulcerative colitis find that high-dose fibre supplements, certain herbal products or unregulated immune-stimulating products worsen symptoms. Supplements can interact with medications and affect disease activity, so it is best to review everything with a pharmacist or gastroenterologist.

    How Do I Know if I Have Bad Bacteria in My Gut?

    A gut microbiome test can give you a snapshot of the bacterial species in your stool, including diversity and relative abundance. There is no single sign that proves bad bacteria are causing symptoms. If you are experiencing persistent digestive symptoms, a healthcare professional can help interpret the test alongside your medical history.

    Bifidobacterium breve Benefits: What Research Shows Bifidobacterium adolescentis: Role, Benefits & How to Increase It

    Find more details about Key Gut Species

    You can find more information on the related topics below.

    Read more: Faecalibacterium prausnitzii and the Gut Microbiome

    View more articles