🦠 Beneficial Probiotic · B Vitamin Producer
Bifidobacterium longum: Your Gut's Lifelong Companion
Present from birth to old age, B. longum persists throughout your entire life. It produces B vitamins, inhibits pathogens, and has a direct line to your brain via the vagus nerve. Clinical trials show it reduces stress and anxiety.
✓ Beneficial probiotic
🧬 Detectable by PCR stool test
🏥 No referral needed
Birth to
old age
old age
persists throughout
your entire life
your entire life
Medically Reviewed
Dr. Samantha Naidoo
MB ChB, FCP (SA) · Medical Director, Epicentre Laboratories
Last reviewed: 19 March 2026
At a glance
Why does B. longum matter?
Lifespan
present from birth through old age
Longest-lasting gut resident
B vits
produces folate, B12, and other B vitamins
Your gut's vitamin factory
↓ Low
in IBS, IBD, depression, obesity
Multiple disease links
🧠
produces GABA and neuroactive compounds
Gut-brain connection
PCR
detectable in all Epicentre gut tests
Walk-in or home kit
Could Your B. longum Levels Be Low?
6 quick questions. Not a diagnosis, but it may help you decide whether testing is worthwhile.
How it works
What does B. longum actually do in your gut?
💊
Produces B vitamins
Synthesises folate, B12, and other B vitamins directly in the gut, supporting energy, red blood cells, and nervous system function.
🍳
Breaks down plant fibres
Ferments dietary fibre into acetate and lactate, nourishing colon cells and lowering gut pH.
🛡️
Detoxifies and protects
Binds toxins and heavy metals. Inhibits pathogens through competitive exclusion and antimicrobial compounds.
🧠
Supports gut-brain axis
Produces GABA and neuroactive compounds. B. longum 1714 reduced stress and cortisol in clinical trials (Allen et al., 2016).
Warning signs
What happens when B. longum levels are low?
Bloating and excess gas after meals
Constipation or irregular bowel movements
Food sensitivities worsening over time
Difficulty digesting high-fibre foods
Increased sugar cravings
B. longum has a direct line to your brain via the vagus nerve. It produces GABA (your calming neurotransmitter) and B vitamins that regulate mood and energy.
Anxiety, low mood, or increased stress sensitivity
Persistent fatigue and brain fog
Weakened immune responses
Skin issues: eczema, acne, or dull complexion
Disrupted sleep patterns
Low B. longum is not a disease in itself, but it is consistently found in people with these conditions.
Anxiety and depression: B. longum 1714 reduced stress and improved cognition (Allen et al., 2016)
IBS: reduces bloating, pain, and bowel irregularity
IBD: lower bifidobacteria in Crohn's and ulcerative colitis
Obesity: altered levels associated with metabolic inflammation
Cognitive decline: emerging evidence for gut-brain axis support in elderly
"
"B. longum is unique because it connects your gut to your brain. When a patient presents with anxiety, brain fog, or fatigue alongside digestive symptoms, low B. longum is one of the first things I investigate."Dr. Samantha Naidoo, MB ChB, FCP (SA), Medical Director, Epicentre
What happens over time
The progression of low B. longum
1
Trigger: stress, antibiotics, ageing, or poor diet
Chronic stress is a particularly strong trigger. Antibiotics, ageing, and low fibre also reduce populations.
2
B vitamin production drops
Less folate and B12 synthesised in the gut. Energy dips. Subtle mood changes begin.
3
Gut-brain communication weakens
Reduced GABA production. Stress feels harder to manage. Sleep and concentration affected.
4
Inflammation and immune decline
Weakened barrier allows endotoxins through. Systemic inflammation rises.
5
Compounding dysbiosis
Harmful bacteria expand. Mood, energy, and immunity continue to decline without intervention.
The good news: B. longum 1714 has specific clinical evidence for stress and mood. Combined with a high-fibre diet, most people notice improvements in energy and mood within 4 to 8 weeks.
Take action
How to boost your B. longum levels
High-fibre foods
Bananas, oats, garlic, onions, resistant starch from cooled potatoes and rice.
Fermented foods
Yoghurt, kefir, kimchi, sauerkraut support the ecosystem B. longum needs.
Targeted supplement
B. longum 1714 for stress/mood. B. longum BB536 for immune/digestive support.
Cut processed sugar
Sugar feeds competitors and worsens inflammation.
Manage stress
Chronic cortisol directly depletes B. longum. Exercise and meditation help.
Prioritise sleep
B. longum supports sleep. Poor sleep depletes it. Break the cycle with consistent habits.
Testing
Test your B. longum levels at Epicentre
All three Epicentre gut packages include B. longum quantification. No referral needed. Walk in or test at home.
Gut Essentials
✓ Includes B. longum
17 probiotic species mapped and quantified.
R1,995
~R499/mo with Payflex · 5% student discount
Complete Gut Profile
✓ Includes B. longum + 44 more targets
Full picture: probiotics, pathogens, parasites, fungi, H. pylori.
R4,850
~R1,213/mo with Payflex · 5% student discount
Gut Deep Dive
✓ Includes B. longum + disease associations
Everything in the Complete Profile plus disease association analysis.
R5,620
~R1,405/mo with Payflex · 5% student discount
Common questions
Frequently asked questions about B. longum
Can I take B. longum as a supplement?
Yes. B. longum 1714 is specifically studied for stress, anxiety, and cognition. B. longum BB536 has evidence for immune and digestive support. Choose named strains with at least 1 billion CFU.
What foods contain or support B. longum?
Fermented dairy often contains bifidobacteria. Prebiotic foods (bananas, oats, garlic, onions, asparagus, resistant starch) feed B. longum in your gut.
How long does it take to restore B. longum levels?
With dietary changes and supplementation (where applicable), most people see measurable improvements within 4 to 8 weeks. A follow-up gut test confirms progress.
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 include VAT. Payflex instalments available. Students get 5% off.
Find Out Where Your B. longum Stands
Explore other gut organisms
Akkermansia muciniphila
B. bifidum
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B. lactis
F. prausnitzii
L. acidophilus
L. gasseri
L. rhamnosus
L. plantarum
R. hominis
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