Swanson Lactobacillus Gasseri - 60 Caps
Swanson Lactobacillus Gasseri - 60 Caps
✎ Too long? Here is what matters:
- ✅ One of the most researched probiotic species in human microbiome science — Lactobacillus gasseri is a naturally occurring resident of the human gut, oral cavity, and urogenital tract, studied in multiple peer-reviewed randomised controlled trials
- ✅ Visceral fat — two independent RCTs — double-blind placebo-controlled trials of L. gasseri SBT2055 documented statistically significant reductions in abdominal visceral fat area at 12 weeks, measured by CT scan
- ✅ Sleep quality — meta-analysis of 6 RCTs — a 2023 systematic review published in Clinical Nutrition found L. gasseri CP2305 produced a significant improvement in Pittsburgh Sleep Quality Index scores versus placebo
- ✅ Native gut coloniser — unlike many probiotic strains, L. gasseri is an autochthonous species — it is indigenous to the human GI tract, with documented tolerance of low pH environments and resistance to bile salts
- ✅ 3 billion CFU per capsule — in a DRCaps® delayed-release vegetarian capsule designed to protect live organisms through stomach acid
- ✅ Vegan ✔ Gluten-free ✔ Dairy-free ✔ No GMOs ✔
- ✅ Ships next day from Dublin — dispatched via DPD across Ireland
ⓘ Food supplement. Not a medicine. Full research references below.
📝 In-Depth Guide
Lactobacillus Gasseri in Ireland: What the Evidence Says and How to Use It
Our editorial team has published a full evidence-led guide to Lactobacillus gasseri — covering the published RCT evidence, strain differences, dosing context, how to interpret probiotic claims under Irish and EU rules, and a verification-first buying framework.
📖 Read the Full Lactobacillus Gasseri Guide →Probiotic.ie Editorial Team | Evidence-led. Not medical advice.
Swanson Lactobacillus Gasseri 3 Billion CFU — What Published Research Has Documented About This Probiotic Species
Lactobacillus gasseri occupies a unique position in probiotic science. Unlike many commercially used strains that originate from fermented foods or dairy, L. gasseri is an autochthonous microorganism — meaning it is indigenous to the human body itself. It is a natural resident of the gastrointestinal tract, oral cavity, and urogenital system, where it has co-evolved with its human host. Published genomic and clinical research describes it as one of the most thoroughly studied probiotic species in modern microbiome science.
This is a food supplement, not a medicine. The research cited below relates to Lactobacillus gasseri as a species and specific strains studied in published settings. It does not constitute a claim that this specific product will produce the same outcomes in any individual.
What Published Research Has Documented About Lactobacillus gasseri
📊 A Natural Coloniser of the Human Gut — The Autochthonous Advantage
Published microbiome research classifies L. gasseri as an autochthonous species — one that is naturally indigenous to the human gastrointestinal tract rather than introduced from an external food source. A comprehensive genomic and clinical review published in FEMS Microbiology Reviews (Selle & Klaenhammer, 2013, PubMed ID: 23488471) documented that L. gasseri's niche-related characteristics include tolerance of low pH environments, resistance to bile salts, and the ability to adhere to the host intestinal epithelium — properties that support its survival and colonisation through the GI tract. These characteristics distinguish it from many commercially used probiotic strains that pass through transiently without establishing residence.
📊 Visceral Fat — Double-Blind RCT Evidence
Two independent multi-centre, double-blind, randomised, placebo-controlled trials have examined the effects of L. gasseri SBT2055 on abdominal fat in Japanese adults with elevated visceral fat areas, using CT scanning as the measurement method.
The first trial (Kadooka et al., 2010, European Journal of Clinical Nutrition) enrolled 87 adults with BMI 24.2–30.7 and randomised them to fermented milk containing L. gasseri SBT2055 or control milk for 12 weeks. In the active group, abdominal visceral and subcutaneous fat areas significantly decreased from baseline by an average of 4.6% and 3.3% respectively.
The second multi-centre dose-response RCT (Kadooka et al., 2013, PubMed ID: 23614897) enrolled 210 healthy adults and tested three dose levels for 12 weeks. Abdominal visceral fat areas at week 12 changed from baseline by an average of -8.5% in the highest dose group, with statistical significance at p<0.01.
📊 Sleep Quality — Systematic Review and Meta-Analysis of 6 RCTs
A systematic literature review and meta-analysis published in Clinical Nutrition (Chu et al., 2023, PubMed ID: 37413809) pooled data from six randomised controlled trials examining the effects of L. gasseri CP2305 on sleep parameters in adults. The ingestion of L. gasseri CP2305 resulted in significant improvement in the Pittsburgh Sleep Quality Index (PSQI) global score compared to control, with a mean difference of -0.77 (95% CI: -1.37 to -0.16, P=0.01). In two studies that included electroencephalogram (EEG) data, output was significantly improved for at least half of the measured EEG outcomes.
📊 Gut Microbiome Balance — Autochthonous Colonisation and Bacteriocin Production
Published microbiome research has documented that L. gasseri produces bacteriocins — antimicrobial peptides that exert inhibitory effects against competing and pathogenic bacteria in the gut environment. The genomic and empirical evidence supporting use of L. gasseri in probiotic applications is substantiated by clinical trial data displaying maintenance of vaginal homeostasis, mitigation of Helicobacter pylori infection, and amelioration of diarrhoea. These mechanisms operate through competitive exclusion, acidification of the gut environment through lactic acid production, and immunomodulation of both innate and adaptive immune systems.
📊 Helicobacter pylori — Adjunct Research
Multiple published studies have examined L. gasseri strains as dietary adjuncts in the context of H. pylori — a common gastric bacterium implicated in gastric discomfort and peptic ulcer disease. A multi-centre randomised double-blind controlled trial published in Gastroenterology Research and Practice (2016) examined L. gasseri OLL2716 in the context of H. pylori-associated dyspepsia. This research represents the strain-specific investigation of L. gasseri as a dietary adjunct — it does not constitute a claim that any supplement form of L. gasseri treats or eradicates H. pylori infection, which remains a medical matter requiring clinical management.
📊 The DRCaps® Delivery System — Why Capsule Format Matters for Live Bacteria
This product uses DRCaps® delayed-release capsules — a vegetarian hypromellose capsule specifically designed to resist dissolution in the acidic stomach environment and release its contents in the more neutral pH of the small intestine. Published data on standard probiotic capsules documents significant CFU losses through gastric acid exposure before organisms reach the intestine. DRCaps® technology is designed to address this by delaying release until the capsule has passed through the stomach. This is a meaningful formulation detail — not all probiotic capsules offer this protection.
A Transparent Note on Strain Specificity
The published RCT evidence on Lactobacillus gasseri cited above is strain-specific — each study used a named strain with a documented strain code (SBT2055, CP2305, BNR17, OLL2716). These are distinct research strains, and their findings cannot be automatically applied to all L. gasseri products. This product lists Lactobacillus gasseri without a published strain code on the label. This is common in the supplement industry, but it is something an informed buyer should know. The research above establishes that L. gasseri as a species has a strong and consistent published evidence base across multiple independent research groups and multiple strain variants. What it cannot confirm is that the specific strain in this product has been studied in the same way. This is an honest assessment — and it is the same caveat that applies to the vast majority of probiotic supplements on the market.
Product Facts
- Active strain: Lactobacillus gasseri — 3 billion CFU per capsule (at time of manufacture)
- Capsule type: DRCaps® delayed-release vegetarian capsule — suitable for vegans and vegetarians
- Capsules per bottle: 60 (60-day supply at 1 cap/day)
- Gluten-free ✔
- Dairy-free ✔
- Non-GMO ✔
- Produced in GMP-certified facilities by Swanson Health Products, USA
- Distributed from Dublin, Ireland by Probiotic.ie — next-day DPD delivery across Ireland
Full Ingredient List (per capsule)
- Lactobacillus gasseri — 3 billion CFU
- Microcrystalline cellulose (plant fibre)
- Hypromellose (DRCaps® vegetable capsule shell)
- Silica
- Magnesium stearate
Allergen note: Free from gluten, dairy, soy, egg, fish, shellfish, and tree nuts.
How to Take
Take one capsule daily with water, preferably with or just before a meal. Do not exceed one capsule per day unless directed by a healthcare professional.
Probiotics are generally most effective when taken consistently over time. Published clinical trials on L. gasseri have used supplementation periods of 12 weeks or longer to assess outcomes.
Who Looks at This Product?
People who typically seek Lactobacillus gasseri supplements include those who:
- Have researched the specific probiotic species literature and want a standalone L. gasseri supplement rather than a multi-strain blend
- Are interested in the body composition, sleep quality, or gut microbiome balance research published on this species
- Are looking for a vegan, gluten-free, dairy-free probiotic in a delayed-release capsule format
- Are working alongside a healthcare professional and want a straightforward single-strain supplement to discuss
This product is intended for adults aged 18 and over. It is not a medicine and is not intended to diagnose, treat, cure, or prevent any disease or health condition.
Frequently Asked Questions
What is Lactobacillus gasseri and where does it come from?
Lactobacillus gasseri is a gram-positive lactic acid bacterium that is naturally indigenous to the human gastrointestinal tract, oral cavity, and urogenital system. Unlike many probiotic strains derived from fermented dairy foods, L. gasseri is classified as an autochthonous species — meaning it is a natural resident of the human body itself. Published microbiome research describes it as one of the most thoroughly studied probiotic species in modern microbiome science. For a full overview read our Lactobacillus gasseri Ireland guide.
What does the research say about L. gasseri and body composition?
Two independent multi-centre, double-blind, placebo-controlled randomised controlled trials examined L. gasseri SBT2055 in adults with elevated visceral fat, using CT scanning to measure fat area. Both trials documented statistically significant reductions in abdominal visceral fat at 12 weeks in the L. gasseri groups versus placebo. These findings relate to the SBT2055 strain specifically. This product does not carry a published strain code, and these outcomes cannot be guaranteed for any individual.
What is the DRCaps® capsule and why does it matter?
DRCaps® is a delayed-release vegetarian capsule technology designed to resist dissolution in stomach acid and release its contents in the small intestine instead. Standard probiotic capsules can lose significant numbers of live organisms through gastric acid exposure before reaching the intestine. DRCaps® is designed to protect the live bacteria through the stomach environment. It is also suitable for vegans and vegetarians.
How many CFU does this product contain?
Each capsule provides 3 billion CFU (colony forming units) of Lactobacillus gasseri at the time of manufacture. CFU counts in probiotic products can decline over shelf life — always store this product as directed (cool, dry place, away from direct heat and sunlight) to preserve viability.
Is this product suitable for vegans and vegetarians?
Yes. The DRCaps® capsule shell is made from hypromellose — a plant-derived cellulose. The formula contains no gelatin, no dairy, no gluten, and no animal-derived ingredients. It is suitable for vegans and vegetarians.
Can I take this alongside other probiotics or supplements?
Yes, L. gasseri can generally be taken alongside other supplements. If you are combining multiple probiotic products, or are on prescription medication, consult your doctor or pharmacist first so they can advise based on your full intake.
Are there any known side effects?
Lactobacillus gasseri has been classified as Generally Recognised as Safe (GRAS) by the US FDA. In published clinical trials it has demonstrated a generally favourable tolerability profile. Mild gastrointestinal symptoms such as bloating or changes in bowel habits are occasionally reported when starting a new probiotic, typically settling within the first week. If you experience any persistent adverse effects, discontinue use and consult a healthcare professional.
How quickly will my order arrive in Ireland?
Orders are dispatched from Dublin, Ireland via DPD next-day delivery. Most orders placed before the daily dispatch cut-off arrive the following working day within Ireland.
What is the returns policy?
Probiotic.ie processes returns in line with Irish and EU consumer protection law. If your product arrives damaged or is not as described, contact Probiotic.ie directly and the team will resolve it for you.
Where can I read a full evidence guide to Lactobacillus gasseri in Ireland?
We have published a complete evidence-led guide covering the published RCT evidence, strain differences, dosing context, and how to interpret probiotic claims under Irish and EU rules. Read the full Lactobacillus gasseri Ireland guide here →
Important Information
This product is a food supplement. It is not a medicine and is not intended to diagnose, treat, cure, or prevent any disease or health condition. Research cited on this page relates to Lactobacillus gasseri as a species and specific named strains studied in published settings. It does not constitute a claim that this specific product will produce the same results in any individual.
Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Do not exceed the stated recommended daily dose. Intended for adults aged 18 years and over.
If you are pregnant, breastfeeding, taking any medication, or under medical supervision, consult your doctor or qualified healthcare professional before use.
Discontinue use and seek medical advice if any adverse reaction occurs. Do not use if the tamper-evident seal under the cap is broken or missing. Store in a cool, dry place, away from direct sunlight. Keep out of reach of children.
Manufactured by: Swanson Health Products, Fargo, North Dakota, USA
Distributed by: Probiotic.ie, Dublin, Ireland