Optibac Probiotics S. Boulardii

Among all the probiotic organisms available today, Saccharomyces boulardii occupies a unique position. Unlike the bacterial strains found in most probiotics, S. boulardii is a probiotic yeast - and that distinction matters. Because it is a yeast rather than a bacterium, it is completely unaffected by antibiotics, making it the go-to probiotic for anyone taking antibiotic treatment or recovering from a course. Optibac Probiotics S. Boulardii delivers this exceptional organism in a high-quality, well-dosed capsule, available in multiple pack sizes to suit different needs.

Saccharomyces boulardii has one of the most extensive research profiles of any probiotic organism, with hundreds of published clinical studies examining its effects across a range of gut health conditions. It is particularly well studied for antibiotic-associated diarrhoea, traveller's diarrhoea, Clostridioides difficile infection, and inflammatory bowel conditions including Crohn's disease and ulcerative colitis. For acute and chronic digestive disruption, few probiotic options come with as robust an evidence base.

How S. Boulardii Works

The mechanisms behind S. boulardii's effectiveness are well characterised. It supports the integrity of the gut mucosal lining, reducing permeability and limiting the ability of pathogens to cross the intestinal barrier. It produces enzymes that can neutralise bacterial toxins - including the toxins produced by C. difficile - and it modulates the gut immune response in ways that reduce inflammation without suppressing normal immune activity. It also helps restore beneficial bacterial populations following disruption, creating conditions that favour the re-establishment of a healthy microbiome.

Because S. boulardii does not colonise the gut permanently, it needs to be taken consistently to maintain its effects. It is active while present and clears naturally once supplementation stops - which is reassuring for those who prefer not to introduce a permanently resident foreign organism.

Multiple Pack Sizes for Different Needs

Optibac S. Boulardii is available in 16, 40, and 80 capsule packs. The 16-capsule pack is ideal for short antibiotic courses or acute digestive upsets. The 40-capsule pack suits a longer course of use or a two-week travel trip. The 80-capsule pack is the best value option for those using S. boulardii as an ongoing part of their gut health routine or for longer travel periods.

Quality, Transparency, and Trust

Optibac uses the clinically validated CNCM I-745 strain of Saccharomyces boulardii - the same strain used in the majority of clinical research. The dose per capsule is clearly stated and independently tested, and the product is free from gluten, dairy, and soya. It is suitable for vegetarians and requires no refrigeration. When it comes to S. boulardii, Optibac is the benchmark.