Probiotics Ireland: Evidence-Based Guide for Irish Consumers (2026)
Written by Darren Grant, Managing Director, Probiotic.ie • Published December 2025 • Updated 1 June 2026
Probiotics Ireland: Evidence-Based Guide for Irish Consumers (2026)
Looking for the deeper clinical comparison? For a strain-by-strain and CFU breakdown of clinical-grade vs everyday probiotics in Ireland — including verified data on Alflorex, Symprove, Optibac and CDS22-formula — see our companion guide: Clinical Probiotics Ireland: Strains, CFU & How to Choose.
At a Glance
- Probiotics are live microorganisms requiring strain-specific identification to match published clinical evidence
- One of the most extensively studied probiotic formulations available in Ireland is the original De Simone Formulation, now supplied as CDS22-formula
- CDS22-formula contains 8 specific strains studied in published research relating to IBS, ulcerative colitis, and pouchitis
- The De Simone Formulation is referenced in ECCO IBD material and the AGA 2024 pouchitis guideline (Barnes et al., Gastroenterology 2024)
- Probiotic supplements in Ireland are regulated as food supplements under FSAI guidelines — health claims are tightly restricted, and no probiotic may be marketed as treating disease
- Key evaluation criteria: strain identity, CFU per daily serving, cold-chain storage, and published trial evidence for the exact formulation
Medical disclaimer (Ireland): This article is for information only and does not replace advice from your GP, pharmacist, gastroenterologist, or hospital team. Probiotics discussed here are food supplements, not medicines, and are not intended to diagnose, treat, cure or prevent any disease.
What Are Probiotics?
Probiotics are live microorganisms — predominantly bacteria and yeasts — consumed through food or food supplements with the intention of conferring a health benefit. They are measured in colony forming units (CFU), which indicates the number of viable microorganisms present at a stated point in time.
The critical distinction that most Irish consumers miss: probiotics are not interchangeable. A product labelled "Lactobacillus acidophilus" is not equivalent to another product with the same genus and species name unless the strain code matches. The strain code — for example, Lactobacillus acidophilus NCIMB 30442 — identifies the exact organism studied in clinical trials.
Key principle: Clinical trial evidence applies to the exact formulation tested — not to products with similar names or ingredients. Always verify the strain code matches the published research before drawing conclusions about efficacy.
One of the Most Studied Probiotic Formulations Available in Ireland
Of the probiotic formulations available to Irish consumers, the original De Simone Formulation has one of the most extensive peer-reviewed evidence bases. Developed by Professor Claudio De Simone, the formulation comprises 8 specific strains and has been the subject of more than 80 peer-reviewed publications across IBS, ulcerative colitis, pouchitis, and antibiotic-associated diarrhoea.
The 8 strains in the De Simone Formulation, as listed on the current Irish product label (NCIMB strain codes), are:
- Streptococcus thermophilus NCIMB 30438
- Bifidobacterium breve NCIMB 30441
- Bifidobacterium animalis subsp. lactis NCIMB 30435
- Bifidobacterium animalis subsp. lactis NCIMB 30436
- Lactobacillus acidophilus NCIMB 30442
- Lactobacillus plantarum NCIMB 30437
- Lactobacillus paracasei NCIMB 30439
- Lactobacillus helveticus NCIMB 30440
Note: older clinical literature and the US Visbiome product list these strains under DSM codes (e.g. DSM 24731–24737). The organisms are the same formulation; the current Irish CDS22-formula label uses the NCIMB designations above. Always check the live product label, as designations and formulations may be updated.
This formulation was previously sold in Ireland as VSL#3 and later as Vivomixx. Following litigation in the United States (concluded around 2016) that separated the De Simone intellectual property from the VSL#3 brand, the original formulation is now available in Ireland as CDS22-formula from Probiotic.ie. The VSL#3 brand belongs to Actial Srl and the Vivomixx brand belongs to Mendes SA; CDS22-formula has no affiliation with those brands.
Clinical guideline recognition
The De Simone Formulation is referenced in ECCO material for inflammatory bowel disease and pouchitis, and the AGA 2024 pouchitis guideline (Barnes et al., Gastroenterology 2024;166(1):59-85) states that the evidence favouring probiotics for preventing pouchitis recurrence is limited to the De Simone Formulation. Trials referenced in this area include Gionchetti et al. (2000) and Mimura et al. (2004) for pouchitis maintenance. These references describe the formulation as studied in the clinical literature; they are not a claim that any product sold here treats these conditions.
Probiotic Products Available in Ireland: Honest Comparison
Irish consumers typically encounter four main probiotic products when researching evidence-based options. Here is a factual comparison. Note that CFU count alone does not predict clinical outcome — the studied strain and dose matter more than the headline number.
| Product | Strains | CFU | Studied for | Storage |
|---|---|---|---|---|
| CDS22-formula | 8 De Simone strains (NCIMB) | 450B (sachet) / 112B (capsule) | UC, pouchitis, IBS (as VSL#3/Vivomixx); ECCO & AGA 2024 pouchitis guidance | Cold-chain |
| Alflorex | 1 (B. longum subsp. infantis 35624) | 1B | IBS (Whorwell et al. 2006, PMID 16863564) | Ambient |
| Symprove | 4 strains (liquid) | 10B per 70ml | IBS symptom severity (Sisson et al. 2014, PMID 24805095) | Ambient; refrigerate after opening |
| Optibac Every Day | 6 strains + FOS | 5B | General daily maintenance | Ambient |
Among these, CDS22-formula carries the formulation referenced in pouchitis guidance. Alflorex has the strongest single-strain evidence for IBS specifically. Symprove and Optibac Every Day are positioned for general gut health maintenance rather than specific clinical conditions. The right choice depends on the goal, not the CFU number. For a full guide to what to expect once you start — including a timeline by condition — see our Signs Probiotics Are Working Ireland guide.
Probiotics for Specific Conditions in Ireland
IBS (Irritable Bowel Syndrome)
Published trials of the De Simone Formulation have reported reductions in IBS symptom scores in studied populations. Alflorex (B. longum subsp. infantis 35624) has specific RCT evidence for IBS from Whorwell et al. (2006). For IBS, strain specificity matters more than CFU count, and responses vary between individuals. Discuss options with your GP or dietitian.
Ulcerative Colitis (UC)
The De Simone Formulation has been studied as an add-on to standard therapy in mild-to-moderate UC, with randomised placebo-controlled data from Sood et al. (2009, PMID 19631292) and Tursi et al. (2010, PMID 20517305). This is research on the formulation, used alongside — not instead of — medical care. Any UC management decisions should be made with your gastroenterology team.
Pouchitis
The AGA 2024 pouchitis guideline states the evidence favouring probiotics for preventing pouchitis recurrence is limited to the De Simone Formulation. For patients post-IPAA surgery, this is a discussion to have with a gastroenterologist; CDS22-formula carries that formulation in Ireland.
Post-Antibiotic Recovery
Lactobacillus rhamnosus GG and Saccharomyces boulardii have published evidence relating to antibiotic-associated diarrhoea, commonly taken with a 2-hour separation gap from the antibiotic dose. Anyone immunocompromised or seriously unwell should speak to a doctor before taking probiotics.
How to Evaluate a Probiotic in Ireland
Five-point evaluation checklist
- Strain identity: Is the full strain code listed (e.g. Lactobacillus acidophilus NCIMB 30442)? Generic names without codes cannot be verified against published research.
- CFU per daily serving: What is the stated CFU at end of shelf life, and is it per daily serving rather than per capsule if multiple capsules are required?
- Cold-chain integrity: If refrigeration is required, how is the product packed and shipped? Probiotic.ie dispatches CDS22-formula via temperature-controlled cold-chain from its facility in Ireland.
- Published trial evidence: Does peer-reviewed evidence exist for this exact formulation — not the genus, not the species, but the exact strain combination at the stated dose?
- FSAI compliance: Are claims on the label compliant with EU Regulation 1924/2006? Be cautious of products making unauthorised medicinal claims.
Probiotics Regulation in Ireland
Probiotic supplements in Ireland are regulated as food supplements under FSAI (Food Safety Authority of Ireland) guidelines and EU Regulation 1924/2006 on nutrition and health claims. This means:
- Probiotics cannot be marketed as medicines in Ireland
- Health claims must be pre-approved under EU law — most probiotic-specific claims have not received authorisation, and the FSAI treats the word "probiotic" itself as an implied health claim
- The HPRA (Health Products Regulatory Authority) oversees products that may be classified as borderline medicinal
- Irish consumers should be cautious of products making strong therapeutic claims without citing published trial evidence
Buying Probiotics in Ireland: Practical Guidance
Cold-chain products
CDS22-formula requires refrigeration and is dispatched via cold-chain from Probiotic.ie. Free DPD priority delivery is available on orders over €75. Products are packed to maintain temperature integrity during transit across Ireland.
Pharmacy versus specialist retailer
Irish pharmacies stock general maintenance probiotics including Alflorex and Optibac. CDS22-formula is sold through Probiotic.ie, the sole authorised Irish distributor of the De Simone Formulation.
Summary
- The De Simone Formulation (CDS22-formula) has one of the most extensive clinical evidence bases of any probiotic available in Ireland — 80+ peer-reviewed publications, ECCO material, and AGA 2024 pouchitis guidance
- For ulcerative colitis, pouchitis, and IBS, strain specificity and formulation identity matter more than brand name or CFU count alone
- Alflorex is the strongest single-strain option studied for IBS specifically
- Probiotic supplements are regulated as food supplements in Ireland under FSAI guidelines — not medicines
- CDS22-formula is available from Probiotic.ie, dispatched cold-chain with free DPD delivery over €75
Frequently Asked Questions
What is the most clinically studied probiotic available in Ireland?
The original De Simone Formulation, now available as CDS22-formula, has been the subject of more than 80 peer-reviewed publications and is referenced in ECCO material and the AGA 2024 pouchitis guideline for ulcerative colitis and pouchitis. It is one of the most extensively studied formulations available to Irish consumers.
What is CDS22 and where can I buy it in Ireland?
CDS22-formula is the current product containing the original De Simone Formulation at 450 billion CFU per sachet and 112 billion CFU per capsule. It is available in Ireland from Probiotic.ie — the sole authorised Irish distributor — with cold-chain dispatch and free DPD delivery on orders over €75.
Are probiotics regulated in Ireland?
Yes. Probiotic supplements are regulated as food supplements under FSAI guidelines and EU Regulation 1924/2006. Health claims are tightly restricted and the FSAI treats the term "probiotic" as an implied health claim. The HPRA oversees borderline medicinal products. Consumers should be cautious of products making unauthorised therapeutic claims.
What is the difference between CDS22, VSL#3, and Vivomixx?
All three names connect to the original De Simone Formulation. Following US litigation concluded around 2016, the De Simone intellectual property was separated from the VSL#3 brand. The current VSL#3 does not contain the original formulation. The original 8-strain De Simone Formulation is now supplied as CDS22-formula. The VSL#3 brand belongs to Actial Srl and Vivomixx to Mendes SA; CDS22-formula has no affiliation with those brands.
Can I take probiotics with antibiotics in Ireland?
Probiotics are commonly taken alongside antibiotics with a 2-hour separation gap from the antibiotic dose. Lactobacillus rhamnosus GG and Saccharomyces boulardii have published evidence relating to antibiotic-associated diarrhoea. Anyone immunocompromised, seriously ill, or hospitalised should speak to a doctor first.
Which probiotic is best for IBS in Ireland?
No single probiotic is best for everyone with IBS. The De Simone Formulation (CDS22-formula) has been studied across IBS subtypes, and Alflorex (B. longum subsp. infantis 35624) has specific RCT evidence from Whorwell et al. (2006). Both are clinically referenced options; the choice depends on subtype, severity and clinician advice.
How long do probiotics take to work and what are the signs they are working?
The most commonly reported early signs are reduced bloating, more regular bowel movements, and improved stool consistency — typically within 2–4 weeks of consistent daily use. How long probiotics take to work depends on the strain and the condition. Published trial data: IBS improvement measured at 4 weeks (Whorwell et al., PMID 16863564); pouchitis maintenance measured over 9–12 months (Gionchetti et al., PMID 10930365). For a full evidence-based timeline by condition, see our Signs Probiotics Are Working Ireland guide.
Related guides (Ireland)
- Clinical Probiotics Ireland: Strains, CFU & How to Choose (in-depth companion guide)
- Signs Probiotics Are Working Ireland: Evidence Guide — timeline by condition, what to expect and when
- Best Probiotic for UC, IBS & Pouchitis Ireland
- Probiotics for Bloating Ireland: What the Evidence Actually Says
- Has Vivomixx Been Discontinued? Availability in Ireland Explained
CDS22-formula: The Original De Simone Formulation — Available in Ireland
CDS22-formula carries the original 8-strain De Simone Formulation at 450 billion CFU per sachet. Dispatched cold-chain from Ireland. Free DPD priority delivery on orders over €75. Food supplement, not a medicine. Irish VAT included.
Shop CDS22-formula in Ireland →Scientific References and Irish Regulatory Sources
- Sood A, et al. (2009). The probiotic preparation, VSL#3 induces remission in patients with mild-to-moderately active ulcerative colitis. Clin Gastroenterol Hepatol, 7(11), 1202-1209. PMID 19631292.
- Tursi A, et al. (2010). Treatment of relapsing mild-to-moderate ulcerative colitis with the probiotic VSL#3 as adjunctive to standard pharmaceutical treatment. Am J Gastroenterol, 105(10), 2218-2227. PMID 20517305.
- Gionchetti P, et al. (2000). Oral bacteriotherapy as maintenance treatment in patients with chronic pouchitis. Gastroenterology, 119(2), 305-309. PMID 10930365.
- Mimura T, et al. (2004). Once daily high dose probiotic therapy for maintaining remission in recurrent or refractory pouchitis. Gut, 53(1), 108-114. PMID 14684584.
- Whorwell PJ, et al. (2006). Efficacy of an encapsulated probiotic Bifidobacterium infantis 35624 in women with irritable bowel syndrome. Am J Gastroenterol, 101(7), 1581-1590. PMID 16863564.
- Barnes EL, et al. (2024). AGA Clinical Practice Guideline on the Management of Pouchitis and Inflammatory Pouch Disorders. Gastroenterology, 166(1), 59-85. PMID 38128971.
- Food Safety Authority of Ireland (FSAI) — Food supplements guidance
- Food Safety Authority of Ireland (FSAI) — Probiotic health claims
- Health Products Regulatory Authority (HPRA) — Ireland