The probiotic market in Ireland is one of the most confusing in the supplement world. Walk into any pharmacy or health food store and you will see products ranging from €5 to €60, with CFU counts from 1 billion to 100 billion, and labels listing anything from one to twenty or more bacterial strains. The marketing is extensive; the clarity is not. This guide cuts through the noise with evidence-based guidance on what actually matters.
The fundamental principle: not all probiotics are created equal, and what works for one condition may not work for another. Probiotic effects are strain-specific — meaning a research result for Lactobacillus rhamnosus GG cannot be extrapolated to a different Lactobacillus rhamnosus strain, or to another species altogether. This is the number one mistake that both consumers and some health professionals make.
CFU stands for Colony Forming Units — the number of viable bacteria in a dose. Higher CFU counts are often used as a marketing claim for "stronger" probiotics, but in practice, the effective dose varies enormously depending on the strain and the condition being addressed.
The most important thing about CFU: it should be guaranteed at end of shelf life, not at time of manufacture. Many cheap products quote the manufacture-date count, which may have halved by the time you take it. Look for labels that say "guaranteed at end of shelf life" or similar.
Antibiotics devastate the gut microbiome. The most important strain for post-antibiotic recovery is Saccharomyces boulardii — notably, a yeast, not a bacterium, and therefore not killed by antibiotics. Multiple Cochrane reviews have confirmed it significantly prevents antibiotic-associated diarrhoea and C. difficile infection. It should ideally be started at the same time as the antibiotic course, taken at a separate time of day, and continued for 1–2 weeks after finishing antibiotics.
After antibiotics, multi-strain probiotics with Lactobacillus and Bifidobacterium species help restore microbiome diversity over 4–8 weeks.
The gut-brain axis is an emerging and exciting field. Early clinical trials have found specific probiotic combinations improve mood, anxiety, and cognitive function through gut-brain signalling pathways. Lactobacillus helveticus R0052 and Bifidobacterium longum R0175 is the best-studied combination for anxiety and mood (found in PrecisionBiotics' Zenflore in Ireland), with a 2011 RCT showing significant anxiety and cortisol reduction.
This is one of the most common questions Pat Coffey gets asked at The Honey Pot, and the answer is more nuanced than the packaging suggests.
Refrigeration requirements depend on the strain and the manufacturing process. Some strains are inherently fragile and require cold storage to maintain viability — these genuinely need to be kept refrigerated. Others have been freeze-dried or microencapsulated and remain viable at room temperature for their full shelf life. A shelf-stable product that has been properly manufactured and tested can be just as effective as a refrigerated one.
Key questions to ask: Has the manufacturer tested viability at room temperature throughout the claimed shelf life? Are the results published or available? For refrigerated products: has the cold chain been maintained throughout distribution and retail storage? A refrigerated probiotic that has been stored incorrectly during distribution may have far lower actual CFU counts than its label claims.
"I tend to recommend refrigerated products from brands I trust where the cold chain is reliably maintained," says Pat. "For convenience, especially for travel or post-antibiotic use, a quality shelf-stable product from a reputable manufacturer is perfectly acceptable."
Many probiotic products now include prebiotics — typically FOS (fructooligosaccharides) or inulin — which feed probiotic bacteria and help them establish in the gut. These combinations are called synbiotics. They can increase the effectiveness of the probiotic, but the prebiotic fibres can also cause bloating and gas in some people, particularly those with IBS. If you are sensitive to FODMAPs (common in IBS), start with a probiotic without prebiotics.
For most conditions, allow 4–8 weeks of consistent use before judging results. Initial temporary bloating or changes in bowel habits in the first week are common and usually settle. If symptoms persist beyond 2 weeks, the strain or dose may not be right for you. For ongoing gut health maintenance, daily probiotics can be taken indefinitely. For specific conditions like post-antibiotic recovery, a defined course of 4–8 weeks is typical.
Ask Pat Which Probiotic Is Right for You — The Honey Pot, Clonmel
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