The Travel Support You Need To Take: Saccharomyces boulardii
As the summer holiday season approaches and travel plans start taking shape, packing lists tend to focus on sun cream, adaptors and the right footwear. Support for digestive health is easy to leave as an afterthought, if it makes the case at all. If you've ever browsed the "traveller's health" shelf of a pharmacy while preparing for a trip, you'll likely have spotted Saccharomyces boulardii. It is one of the most extensively studied probiotics for gut resilience while abroad and worth considering.
Not Your Average Probiotic
Many probiotic products on the market today are bacterial, such as Lactobacillus and Bifidobacterium. However, Saccharomyces boulardii is unique, being a non-bacterial microorganism, a yeast. This yeast strain was first isolated back in the 1920s from lychee and mangosteen fruit by French microbiologist Henri Boulard.
Key Benefits and Mechanisms of Action
The science behind the gut microbiome has exploded over the last decade, now considered a key element impacting the host health. Roles of the gut microbiome include maintenance of the epithelial barrier, protection against pathogen colonisation and modulation of the immune system. Probiotics are thought to exhibit a variety of mechanisms including antitoxin effects, metabolic regulation, signalling pathway modification and regulation of the immune system. Saccharomyces boulardii has been found to participate in several of these effects within its probiotic activity.
Saccharomyces boulardii is one of the most well-researched probiotics specifically for traveller's diarrhoea. Importantly, it produces enzymes that directly break down toxins from common travel pathogens, competes with harmful bacteria for space and nutrients in the gut, reinforces the gut's own protective mucus layer, and helps reduce the inflammatory immune response that drives further symptoms.
Getting the most out of it: Practical Considerations
Timing Matters. As time is needed to establish itself in the gut before it can offer meaningful protection, taking it in the days before you travel and continuing consistently throughout your trip gives it the best chance to do its job and provide the benefits when you're exposed to unfamiliar food, water and routines.
Consistency is key. Protective effects in the study data were closely tied to how rigorously the supplement was taken, sporadic use appears to blunt the benefit considerably.
Temperature and formulation stability. As a live organism, viability can be affected by heat and moisture. This is worth bearing in mind when packing for a hot-climate trip, and a reason some travel-specific formulations favour heat-stable capsule casings.
The prebiotic connection, an emerging consideration. A newer strand of research is examining how co-administering prebiotics, non-digestible fibres such as inulin, fructooligosaccharides (FOS), and galactooligosaccharides can enhance S. boulardii's survival and functional activity. Practically, this suggests that pairing S. boulardii with a modest source of fermentable fibre, such as lightly cooked onions, leeks, oats, slightly underripe bananas, may help the yeast establish itself more robustly, though it is important to note most of this evidence is still early research.
Summary
Saccharomyces boulardii is a well-studied yeast-based probiotic that supports gut resilience during travel by tackling traveller's diarrhoea from multiple angles. Unlike bacterial probiotics, it isn't affected by antibiotics. Shop here
Key takeaways:
Author:
Charlotte, Co-Founder, The Nutritional Biochemist
BSc Biochemistry, MSc Management, MSc Nutrition (King’s College London)
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