🦠 Beneficial Probiotic · Butyrate Producer
Faecalibacterium prausnitzii: Your Gut's Anti-Inflammatory Powerhouse
This single species makes up 5 to 15% of all bacteria in a healthy gut. It produces butyrate, the fuel your gut lining needs to stay intact. When levels drop, inflammation rises and the effects spread far beyond your stomach.
✓ Beneficial probiotic
🧬 Detectable by PCR stool test
🛡️ Anti-inflammatory
🏥 No referral needed
5–15%
of all bacteria
in a healthy gut
in a healthy gut
Medically Reviewed
Dr. Samantha Naidoo
MB ChB, FCP (SA) · Medical Director, Epicentre Laboratories
Published: 7 September 2025 · Last reviewed: 18 March 2026
At a glance
Why does F. prausnitzii matter?
5–15%
of total gut bacteria in healthy adults
One of the most abundant species
#1
butyrate producer in the human gut
Fuel for your gut lining
↓ Low
in Crohn's, colitis, IBS, obesity
He et al., 2021
70%
of your immune system is gut-based
F. prausnitzii helps regulate it
PCR
detectable in all Epicentre gut tests
Walk-in or home kit
Could Your F. prausnitzii Levels Be Low?
6 quick questions. Not a diagnosis, but it may help you decide whether testing is worthwhile.
How it works
What does F. prausnitzii actually do in your gut?
Faecalibacterium prausnitzii does more than most probiotics. It has a specific and measurable role in keeping your gut lining intact, your inflammation low, and your immune system balanced.
🧱
Produces butyrate
Butyrate is the primary fuel for the cells lining your colon. Without it, the gut barrier weakens and toxins can leak into the bloodstream.
🛡️
Reduces inflammation
Actively suppresses pro-inflammatory pathways in the gut. People with higher levels have measurably lower gut inflammation.
🔒
Seals the gut barrier
Strengthens tight junctions between gut cells, preventing "leaky gut" where toxins and bacteria enter the bloodstream.
⚖️
Regulates immune balance
Balances pro-inflammatory and anti-inflammatory immune responses. Prevents the immune system from attacking your own tissues.
Warning signs
What happens when F. prausnitzii levels are low?
Low levels affect more than just your digestion. Because butyrate influences inflammation and immune function throughout the body, the effects can show up in surprising places.
Chronic bloating and excess gas, especially after meals
Alternating diarrhoea and constipation without clear cause
Abdominal discomfort or cramping
Heartburn or acid reflux that doesn't respond to antacids
Food sensitivities that seem to be getting worse over time
The gut-body connection: Your gut produces over 90% of your serotonin and communicates directly with your brain, skin, and immune system via the vagus nerve. Low butyrate production has ripple effects.
Persistent fatigue and brain fog
Skin flare-ups: acne, eczema, rosacea
Low mood, anxiety, or irritability
Catching colds and infections more often
Sugar cravings (harmful bacteria drive these when F. prausnitzii is low)
Low F. prausnitzii is not a disease in itself, but it is consistently found in people with these conditions. Testing your levels gives you the chance to act before symptoms progress.
Crohn's disease: F. prausnitzii is significantly depleted in Crohn's patients (He et al., 2021)
Ulcerative colitis: lower levels correlate with more severe flare-ups
IBS: reduced butyrate production worsens gut motility and pain
Obesity and type 2 diabetes: associated with metabolic inflammation from low butyrate
Colon cancer: butyrate protects colon cells; less butyrate = less protection (Fava et al., 2022)
Autoimmune conditions: leaky gut from low F. prausnitzii can trigger immune overreaction
"
"When I see low F. prausnitzii on a gut test, it tells me the patient's gut barrier is probably compromised. These are the patients who come in with fatigue, skin problems, and mood issues that nobody has been able to explain. The gut is always worth investigating."Dr. Samantha Naidoo, MB ChB, FCP (SA), Medical Director, Epicentre
What happens over time
The progression of low F. prausnitzii
Low levels don't cause problems overnight. This is a gradual process where each stage makes the next one more likely.
1
Trigger: antibiotics, stress, or poor diet
A course of antibiotics, chronic stress, or a diet low in fibre and high in processed food reduces F. prausnitzii populations. You probably won't notice anything yet.
2
Butyrate production drops
Less fuel for your gut lining. The cells that form the intestinal barrier start to weaken. Subtle symptoms may appear: mild bloating, occasional fatigue, sugar cravings.
3
Gut barrier weakens ("leaky gut")
Toxins and bacterial fragments cross into the bloodstream. The immune system detects them and triggers low-grade inflammation. Skin, mood, and energy may be affected.
4
Chronic inflammation sets in
Sustained inflammation affects the gut, joints, skin, and brain. This is the stage where conditions like IBS, IBD flare-ups, metabolic syndrome, and autoimmune triggers become more likely.
5
Dysbiosis feeds itself
Harmful bacteria thrive in the inflamed environment while beneficial species like F. prausnitzii decline further. Without testing and intervention, this cycle is difficult to break.
The good news: F. prausnitzii levels respond well to dietary changes and targeted prebiotics. Testing shows you exactly where you stand, and a follow-up test confirms your progress.
Take action
How to boost your F. prausnitzii levels
Because F. prausnitzii is an obligate anaerobe (it dies in oxygen), you can't take it as a standard supplement. The most effective approach is to feed the F. prausnitzii already in your gut.
Prebiotic fibre
Bananas, garlic, onions, leeks, asparagus, oats, and artichokes. These directly feed F. prausnitzii.
Polyphenol-rich foods
Berries, dark chocolate, green tea, and red wine (in moderation). Polyphenols selectively encourage F. prausnitzii growth.
Fermented foods
Yoghurt, kefir, kimchi, sauerkraut. These introduce diverse bacteria that support the ecosystem F. prausnitzii needs.
Cut processed sugar
Sugar feeds Candida and other harmful species that compete with F. prausnitzii for space and resources.
Manage stress
Chronic cortisol alters gut motility and bacterial balance. Regular exercise, sleep, and stress reduction help.
Targeted supplementation
A gut test tells you exactly which species are low. Supplement with purpose, not guesswork.
Testing
Test your F. prausnitzii levels at Epicentre
All three Epicentre gut packages include F. prausnitzii quantification. No referral needed. Walk in or test at home.
Gut Essentials
✓ Includes F. prausnitzii
17 probiotic species mapped and quantified. Shows whether your beneficial bacteria are at healthy levels.
R1,995
~R499/mo with Payflex (4x interest-free) · 5% student discount
Complete Gut Profile
✓ Includes F. prausnitzii + 44 more targets
Full picture: probiotics, pathogens, parasites, fungi, H. pylori. The test most patients choose.
R4,850
~R1,213/mo with Payflex · 5% student discount
Gut Deep Dive
✓ Includes F. prausnitzii + disease associations
Everything in the Complete Profile, plus analysis linking your results to conditions like IBS, IBD, and metabolic disorders.
R5,620
~R1,405/mo with Payflex · 5% student discount
Home collection kits available. All gut tests can be done at home. We deliver a stool collection kit in discreet packaging with prepaid return. Results in 5 to 7 working days.
Common questions
Frequently asked questions about F. prausnitzii
What is Faecalibacterium prausnitzii?
One of the most abundant beneficial bacteria in the healthy human gut, making up 5 to 15% of all intestinal bacteria. It produces butyrate, a short-chain fatty acid that fuels your gut lining, reduces inflammation, and helps regulate immune function. Low levels are consistently found in people with Crohn's disease, ulcerative colitis, IBS, and metabolic disorders.
Can I take F. prausnitzii as a supplement?
Not easily. F. prausnitzii is an obligate anaerobe, meaning it dies when exposed to oxygen. This makes it extremely difficult to produce as a viable supplement. The most effective approach is to feed the F. prausnitzii already in your gut using prebiotic fibres (garlic, onions, oats, bananas), polyphenol-rich foods (berries, green tea), and fermented foods. A gut test tells you which species need support.
What causes F. prausnitzii to become depleted?
The most common causes are antibiotics (which kill beneficial and harmful bacteria alike), chronic stress, diets high in processed foods and sugar, and low fibre intake. Age is also a factor: microbial diversity naturally declines after 50. Even a single course of antibiotics can reduce F. prausnitzii levels for months.
How do I know if my F. prausnitzii levels are low?
There is no way to know without testing. Symptoms like chronic bloating, fatigue, skin problems, and frequent illness can all point to low butyrate production, but these symptoms overlap with many other conditions. A PCR stool test at Epicentre quantifies your exact F. prausnitzii levels. All three gut packages include this species.
How long does it take to restore F. prausnitzii levels?
With consistent dietary changes (more fibre, fermented foods, less sugar), most people see measurable improvements within 4 to 8 weeks. A follow-up gut test confirms progress. Recovery is slower after prolonged antibiotic use or in people with IBD.
Do I need a doctor's referral for gut testing?
No. Walk into any Epicentre branch in Durban (Hillcrest), Cape Town (Observatory), or Johannesburg (Parktown North). Or order a home stool collection kit delivered to your door in discreet packaging with prepaid return.
How much does a gut test cost?
Gut Essentials (17 probiotic targets): R1,995. Complete Gut Profile (45 targets): R4,850. Gut Deep Dive (45 targets + disease associations): R5,620. All prices are cash rates inclusive of VAT. Payflex interest-free instalments available. Students get 5% off gut health packages.
Find Out Where Your F. prausnitzii Stands
Explore other gut organisms
Akkermansia muciniphila
Bifidobacterium breve
Bifidobacterium lactis
Bifidobacterium longum
Lactobacillus acidophilus
Lactobacillus rhamnosus
Roseburia hominis
Candida albicans
Helicobacter pylori
Giardia lamblia
← Full Gut Health Guide
Epicentre Walk-In Labs
Practice #1117394 · Founded 2001 · Durban (Hillcrest) · Cape Town (Observatory) · Johannesburg (Parktown North)
