🦠 Beneficial Probiotic · Metabolic Regulator
Lactobacillus gasseri: Your Gut's Weight Management Ally
L. gasseri has emerged as one of the most promising probiotics for weight management. Clinical trials show it reduces abdominal fat, supports vaginal health, and modulates immune responses.
✓ Beneficial probiotic
🧬 Detectable by PCR stool test
🏥 No referral needed
8.5%
abdominal fat reduction
in clinical trial
in clinical trial
Medically Reviewed
Dr. Samantha Naidoo
MB ChB, FCP (SA) · Medical Director, Epicentre Laboratories
Last reviewed: 19 March 2026
At a glance
Why does L. gasseri matter?
8.5%
abdominal fat reduction in 12-week trial
Kadooka et al., 2010
⚖️
modulates fat storage and metabolism
Metabolic regulator
🛡️
colonises vaginal tract
Protects against infections
↓ Low
in obese individuals and those with metabolic syndrome
Weight-metabolism link
PCR
detectable in all Epicentre gut tests
Walk-in or home kit
Could Your L. gasseri Levels Be Low?
6 quick questions. Not a diagnosis, but it may help you decide whether testing is worthwhile.
How it works
What does L. gasseri actually do in your gut?
⚖️
Reduces abdominal fat
Clinical trials show L. gasseri SBT2055 significantly reduces visceral fat, BMI, and waist circumference over 12 weeks (Kadooka et al., 2010).
🛡️
Protects vaginal health
Colonises the vaginal tract and produces lactic acid and hydrogen peroxide, inhibiting BV and yeast infections.
💪
Modulates immune responses
Enhances immune cell activity and reduces allergic responses. Supports both gut and systemic immunity.
🔥
Reduces inflammation
Lowers inflammatory markers associated with obesity and metabolic syndrome.
Warning signs
What happens when L. gasseri levels are low?
Bloating, especially around the midsection
Irregular bowel movements
Abdominal discomfort after meals
Increased gas production
Strong cravings for sugary or processed foods
L. gasseri influences how your body stores fat and manages inflammation. It also protects the vaginal tract. When levels are low, metabolic and gynaecological symptoms often appear together.
Stubborn abdominal fat that resists diet and exercise
Recurrent vaginal yeast infections or BV
Fatigue and low energy linked to metabolic inflammation
Persistent sugar cravings
Rising inflammatory markers
Low L. gasseri is not a disease in itself, but it is consistently found in people with these conditions.
Obesity: L. gasseri SBT2055 reduced abdominal fat by 8.5% in 12-week trial
Vaginal infections: colonises vaginal tract and inhibits Candida and BV pathogens
Metabolic syndrome: reduces markers associated with insulin resistance
Allergies: modulates immune responses and reduces allergic hypersensitivity
H. pylori: enhances eradication when used alongside standard treatment
"
"L. gasseri is the species I discuss with patients who have stubborn abdominal fat alongside gut symptoms. The clinical data on visceral fat reduction is surprisingly strong for a probiotic. It is not a magic pill, but combined with diet changes, it can shift the needle."Dr. Samantha Naidoo, MB ChB, FCP (SA), Medical Director, Epicentre
What happens over time
The progression of low L. gasseri
1
Trigger: high-sugar diet, antibiotics, or sedentary lifestyle
Processed food and sugar feed competitors. Antibiotics and inactivity further reduce L. gasseri populations.
2
Metabolic signalling disrupts
Without L. gasseri modulating fat storage signals, the body begins storing more visceral fat, especially around the abdomen.
3
Vaginal protection weakens
For women, declining L. gasseri in the vaginal tract increases susceptibility to yeast infections and BV.
4
Inflammation and weight gain compound
Visceral fat itself produces inflammatory compounds, creating a feedback loop. Cravings increase as harmful bacteria expand.
5
Entrenched metabolic dysbiosis
The combination of weight gain, inflammation, and microbial imbalance becomes self-reinforcing. Testing identifies the starting point for intervention.
The good news: L. gasseri SBT2055 has specific clinical evidence for abdominal fat reduction. Combined with dietary changes and exercise, measurable improvements typically appear within 8 to 12 weeks.
Take action
How to boost your L. gasseri levels
Fermented foods
Yoghurt, kefir, kimchi, and other fermented foods support L. gasseri and overall microbial diversity.
High-fibre diet
Whole grains, vegetables, legumes feed beneficial bacteria including L. gasseri.
L. gasseri SBT2055
The strain with the strongest weight management evidence. Look for named strain supplements.
Regular exercise
Physical activity increases L. gasseri abundance and supports metabolic health synergistically.
Cut refined sugar
Sugar directly feeds competitors and promotes fat storage pathways.
Sleep and stress
Both affect metabolism and microbial balance. Consistent patterns support recovery.
Testing
Test your L. gasseri levels at Epicentre
All three Epicentre gut packages include L. gasseri quantification. No referral needed. Walk in or test at home.
Gut Essentials
✓ Includes L. gasseri
17 probiotic species mapped and quantified.
R1,995
~R499/mo with Payflex · 5% student discount
Complete Gut Profile
✓ Includes L. gasseri + 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 L. gasseri + 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 L. gasseri
Can I take L. gasseri as a supplement?
Yes. L. gasseri SBT2055 is the strain with the strongest clinical evidence for weight management. Other strains support vaginal and immune health. Choose products with named strains.
What foods contain or support L. gasseri?
Found in some fermented dairy products and traditional fermented foods. Prebiotic-rich foods (garlic, onions, whole grains) support existing L. gasseri populations.
How long does it take to restore L. gasseri 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 L. gasseri Stands
Explore other gut organisms
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L. plantarum
R. hominis
← Full Gut Health Guide
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