Quick Summary
Saccharomyces boulardii is one of the world's most researched probiotic strains for travellers' diarrhoea and travel-related digestive health. Unlike many probiotics, it isn't a bacterium—it's a beneficial probiotic yeast. This gives it several unique characteristics that have made it the subject of numerous clinical studies.
Quick Answer
What is Saccharomyces boulardii?
Saccharomyces boulardii is a beneficial probiotic yeast—not a bacterium. It has been extensively researched in relation to travellers' diarrhoea and travel-related digestive health. One reason it has attracted significant scientific interest is because it behaves differently from many bacterial probiotics.
Why This Matters
You've probably never heard anyone say:
"I'm taking Saccharomyces boulardii."
They usually say:
"I'm taking a probiotic."
But as we discussed in our previous guide, not all probiotics are created equal.
The probiotic strain matters.
And few strains have attracted as much attention in travel medicine as Saccharomyces boulardii.
So what makes it different?
Let's take a look.
1. It's Not Actually a Bacterium
One of the biggest surprises about Saccharomyces boulardii is that it isn't a bacterium at all—it's a beneficial yeast.
Most probiotics are bacteria.
Saccharomyces boulardii belongs to an entirely different group of microorganisms.
That difference gives it several unique characteristics.
💡 Did You Know?
The word Saccharomyces comes from Greek and literally means "sugar fungus."
2. It Naturally Survives Stomach Acid and Bile
One of the biggest challenges for many probiotics is surviving the harsh acidic environment of the stomach.
Saccharomyces boulardii naturally survives stomach acid and bile, allowing it to reach the intestines alive.
This is one of the reasons it has attracted significant scientific interest for digestive health during travel.
3. It Can Be Taken Alongside Most Antibiotics
Many bacterial probiotics are reduced or destroyed by antibiotics.
Because Saccharomyces boulardii is a yeast rather than a bacterium, it isn't affected in the same way by most antibiotics.
This makes it a unique option when probiotic support is being considered during or after antibiotic use.
Always follow the advice of your doctor or healthcare professional regarding prescribed medicines.
4. It's One of the World's Most Researched Probiotic Strains for Travellers
Scientific research matters.
Saccharomyces boulardii has been investigated in numerous clinical studies relating to travellers' diarrhoea and travel-related digestive health.
Like all therapeutic ingredients, research continues to evolve, but it remains one of the most extensively researched probiotic strains in this area.
5. It's Convenient for Travel
Travellers don't usually have access to a refrigerator while sightseeing, flying or moving between destinations.
Many Saccharomyces boulardii products are shelf stable, making them particularly convenient for travel.
Always follow the storage instructions provided by the manufacturer.
6. Why Has It Become So Popular With Travellers?
Travel places unique demands on your digestive system.
Different food.
Different water.
Different bacteria.
Different routines.
For these reasons, many travellers choose products containing Saccharomyces boulardii because of its unique characteristics and the extensive scientific research surrounding its use in travellers' diarrhoea and travel-related digestive health.
What Should You Look For?
If you're comparing products containing Saccharomyces boulardii, ask yourself:
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Is the probiotic strain clearly identified?
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How much Saccharomyces boulardii does each serving contain?
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Does the company explain why it has chosen this strain?
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Is the product transparent about all of its ingredients?
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Is the product listed on the Australian Register of Therapeutic Goods (ARTG), where appropriate?
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Can you independently verify the company's claims?
As always, understanding what's behind the label is just as important as reading the front of the pack.
Frequently Asked Questions
Is Saccharomyces boulardii a probiotic?
Yes. It is a probiotic—but unlike many others, it's a beneficial yeast rather than a bacterium.
Is Saccharomyces boulardii the same as other probiotics?
No. Different probiotic strains have different characteristics and have been researched for different purposes. Research supporting one probiotic strain cannot automatically be applied to another.
Does Saccharomyces boulardii survive stomach acid?
Yes. One of its distinguishing characteristics is its ability to survive stomach acid and bile, allowing it to reach the intestines alive.
Can Saccharomyces boulardii be taken with antibiotics?
Because it is a yeast rather than a bacterium, Saccharomyces boulardii is generally not affected by most antibiotics. Always follow the advice of your healthcare professional.
Why is Saccharomyces boulardii popular with travellers?
It has been extensively researched in relation to travellers' diarrhoea and travel-related digestive health, making it one of the best-known probiotic strains used in travel health products.
Evidence Snapshot
Last reviewed: July 2026
Prepared using:
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Peer-reviewed scientific literature
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Australian consumer health information
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Current scientific literature relating to Saccharomyces boulardii
This article is intended for educational purposes and will be reviewed periodically as new research becomes available.
The Bottom Line
Saccharomyces boulardii isn't just another probiotic.
It's a unique probiotic yeast with characteristics that distinguish it from many bacterial probiotics.
Its ability to survive stomach acid and bile, its compatibility with most antibiotics, and its extensive scientific research relating to travellers' diarrhoea are just some of the reasons it has become one of the world's most recognised probiotic strains for travellers.
Understanding these differences can help you make a more informed decision the next time you're choosing a travel probiotic.
Continue Your Travel Health Journey
If you enjoyed this guide, you may also like:
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Not All Probiotics Are Created Equal: What Every Traveller Should Know – Learn how to compare probiotic products, understand why the probiotic strain matters and discover what to look for before you buy.
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