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Bio-Kult S. Boulardii 30 Capsules

Bio-Kult S. Boulardii 30 Capsules

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  • ✔️ Contains live Saccharomyces boulardii yeast for gut flora support
  • ✔️ Helps reduce duration of antibiotic-associated diarrhoea
  • ✔️ Suitable for travel diarrhoea prevention before and during trips
  • ✔️ Naturally antibiotic-resistant — effective alongside antibiotic courses
  • ✔️ No refrigeration required — convenient for everyday and travel use

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What Are Saccharomyces Boulardii Capsules?

 

Bio-Kult S. Boulardii 30 Capsules contain a clinically studied live yeast — Saccharomyces boulardii — that has been used for decades to support gut health and help manage various forms of diarrhoea. Unlike bacterial probiotics, this is a yeast-based supplement, which means it survives antibiotic treatment and can be taken alongside a course of antibiotics without being destroyed. If you've ever struggled with an upset stomach after antibiotics, or you're heading abroad and want to protect your digestion, this product is worth knowing about. You'll find it listed alongside other vitamins and supplements at Cured Pharmacy.

Each capsule delivers a measured dose of Saccharomyces boulardii capsules — the same strain referenced in clinical literature for its role in reducing the duration and severity of acute diarrhoea. The NHS acknowledges that probiotics may help with diarrhoea, particularly antibiotic-associated diarrhoea, though individual responses can vary.

 

How Do Bio-Kult S. Boulardii Capsules Work?

 

The mechanism behind S. boulardii is genuinely interesting. Rather than simply adding bacteria to your gut, this live yeast works through several distinct pathways to restore intestinal balance:

  • It temporarily colonises the intestinal tract, competing with harmful pathogens for space and nutrients
  • It produces proteases that break down bacterial toxins, including those produced by Clostridioides difficile
  • It stimulates the production of secretory IgA, an antibody that helps protect the gut lining
  • It reduces intestinal inflammation by modulating immune signalling pathways
  • It supports the integrity of the intestinal epithelial barrier, reducing permeability

Because it is a yeast rather than a bacterium, it is naturally resistant to antibiotics. This makes it particularly useful when gut flora has been disrupted by a course of antibiotics.

 

Who Should Consider Using Bio-Kult S. Boulardii?

 

This supplement suits a fairly wide range of people. It's not a prescription medicine, but that doesn't mean it's right for everyone — so it's worth thinking about whether it fits your situation before you buy.

Bio-Kult S. Boulardii may be suitable for:

  • Adults and children taking antibiotics who want to reduce the risk of antibiotic-associated diarrhoea
  • Travellers heading to destinations where traveller's diarrhoea is a concern
  • People recovering from a gastrointestinal infection who want to restore gut flora balance
  • Those with recurrent loose stools or gut discomfort linked to disrupted intestinal flora

It is not suitable for people who are severely immunocompromised, have a central venous catheter in place, or have a known allergy to yeast. Always speak to your pharmacist or GP if you're unsure.

 

How Does Bio-Kult S. Boulardii Compare to Other Probiotics?

 

Feature Bio-Kult S. Boulardii Typical Bacterial Probiotic
Active organism Live yeast (S. boulardii) Live bacteria (e.g. Lactobacillus)
Survives antibiotics? Yes — naturally antibiotic-resistant No — often killed by antibiotics
Evidence for diarrhoea Strong clinical evidence Varies by strain
Suitable for travel diarrhoea Yes Limited evidence

 

Is Bio-Kult S. Boulardii Suitable to Store at Room Temperature?

 

One practical advantage of this product is that it does not require refrigeration. Store it below 25°C in a cool, dry place away from direct sunlight and moisture. This makes it particularly convenient for travel — you can pack it in your hand luggage without worrying about a cold chain. If you're also managing diarrhoea symptoms while travelling, having a room-temperature-stable supplement is genuinely useful.

Keep the capsules in their original packaging and out of reach of children. Do not use after the expiry date printed on the pack.

This product is a food supplement. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Bio-Kult S. Boulardii 30 Capsules specifications
Treatment category Gut health / Probiotic supplement
Active ingredient Saccharomyces boulardii (live yeast)
Mechanism of action Temporary intestinal colonisation; pathogen inhibition; immune modulation
Suitable for Adults and children (seek advice for under 12s)
Pack size 30 capsules
UK classification Food supplement (not a licensed medicine)
Preparation Capsule
Route of administration Oral
Storage Below 25°C, dry place, away from sunlight

Specifications of Bio-Kult S. Boulardii 30 Capsules

 

What Is Bio-Kult S. Boulardii and What Is It Used For?

 

Bio-Kult S. Boulardii 30 Capsules are a food supplement containing the live yeast Saccharomyces boulardii. This yeast has a well-established history of use in supporting gut health, particularly in situations where the natural balance of intestinal flora has been disrupted. It is used to help manage and reduce the duration of acute diarrhoea, including antibiotic-associated diarrhoea and traveller's diarrhoea. It may also be used as a preventative measure when starting a course of antibiotics or before travelling to higher-risk destinations.

This is not a licensed medicine — it is classified as a food supplement in the UK. It does not treat the underlying cause of infection, but it supports the gut environment during and after disruption. If diarrhoea is severe, bloody, or accompanied by high fever, seek medical advice promptly rather than relying on a supplement alone.

 

What Do You Need to Know Before Using Bio-Kult S. Boulardii?

 

Before taking this supplement, there are some important contraindications and precautions to be aware of:

  • Do not take if you have a known allergy or hypersensitivity to yeast or any ingredient in the capsule
  • Do not take if you are severely immunocompromised (e.g. undergoing chemotherapy, have HIV/AIDS with low CD4 count, or are on high-dose immunosuppressants) without first consulting your doctor
  • Do not take if you have a central venous catheter in place — there is a small risk of fungaemia in this group
  • Consult your GP or pharmacist before use if you are pregnant or breastfeeding
  • Seek medical advice before giving to children under 12

Regarding drug interactions, the following should be noted:

  • Antifungal medicines (e.g. fluconazole, itraconazole) may reduce the effectiveness of S. boulardii as they act against yeasts — avoid taking them together
  • No significant interactions have been identified with antibiotics, as S. boulardii is naturally antibiotic-resistant

 

How Should You Use Bio-Kult S. Boulardii?

 

Always follow the directions on the product label or as advised by your pharmacist. The capsules are taken orally with water. If you find swallowing capsules difficult, you can open them and mix the contents into a cool (not hot) drink or soft food — heat may damage the live yeast.

  1. Wash your hands before handling the capsules
  2. Take one to two capsules per day, or as directed
  3. Swallow whole with a glass of water, or open and mix contents with cool food or drink
  4. Take with or just before a meal to help protect the yeast from stomach acid
  5. Continue for the recommended duration — do not stop early if symptoms improve
Indication Age Group Dose Frequency
Antibiotic-associated diarrhoea Adults 1–2 capsules Daily, during and after antibiotic course
Traveller's diarrhoea prevention Adults 1–2 capsules Daily, starting a few days before travel
General gut support Adults 1 capsule Daily

If you are travelling and also want to explore other travel health products, Cured Pharmacy stocks a range of relevant items to help you prepare.

 

What Are the Possible Side Effects of Bio-Kult S. Boulardii?

 

Bio-Kult S. Boulardii is generally well tolerated. Most people experience no side effects at all. However, as with any supplement that introduces live organisms into the gut, some mild digestive symptoms can occur — particularly in the first few days of use as your gut adjusts.

Common side effects:

  • Bloating
  • Flatulence (wind)
  • Mild abdominal discomfort

Less common side effects:

  • Nausea
  • Constipation (rare)
  • Allergic reaction — stop use and seek medical advice if you develop a rash, itching, or swelling

In very rare cases, particularly in severely immunocompromised individuals, S. boulardii has been associated with fungaemia (yeast entering the bloodstream). This is why the product is not recommended for this group without medical supervision. If you experience any unusual or severe symptoms, stop taking the supplement and contact your GP or pharmacist promptly. You can also browse our IBS and cramps range if you're managing ongoing gut discomfort alongside probiotic use.

 

How Should You Store Bio-Kult S. Boulardii?

 

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and sources of heat or moisture
  • No refrigeration required — suitable for travel
  • Keep in the original packaging with the lid tightly closed
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the pack
  • Do not mix capsule contents with hot food or drinks — heat damages the live yeast

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Bio-Kult S. Boulardii capsules online in the UK?

You can buy Bio-Kult S. Boulardii 30 Capsules directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for £15.98. No prescription is needed as this is an over-the-counter food supplement. Simply add it to your basket and it will be dispatched to your door.

How do Saccharomyces boulardii capsules work in the body?

Saccharomyces boulardii is a live yeast that temporarily colonises the intestinal tract, competing with harmful pathogens and producing enzymes that neutralise bacterial toxins. It also stimulates the gut's immune defences by increasing secretory IgA production and helps maintain the integrity of the intestinal lining. Because it is a yeast rather than a bacterium, it is not affected by antibiotic treatment.

How do I take Bio-Kult S. Boulardii step by step?

Take one to two capsules daily with a glass of water, ideally with or just before a meal. If you find swallowing capsules difficult, open the capsule and stir the contents into a cool drink or soft food — avoid hot liquids as heat can damage the live yeast. Continue taking for the recommended duration even if your symptoms improve early.

What is the best time of day to take Bio-Kult S. Boulardii?

There is no single "correct" time, but taking the capsule with or just before a meal is generally recommended. Food helps buffer stomach acid, which may improve the survival of the live yeast as it passes through the upper digestive tract. Consistency matters more than timing — try to take it at the same time each day.

What are the side effects of Bio-Kult S. Boulardii?

Most people tolerate this supplement without any problems. Mild bloating or flatulence can occur in the first few days as your gut adjusts to the live yeast — this usually settles on its own. In rare cases, particularly in immunocompromised individuals, more serious reactions can occur, so always seek medical advice if you are in a high-risk group.

Who should not take Bio-Kult S. Boulardii capsules?

This supplement is not suitable for people who are severely immunocompromised, have a central venous catheter, or have a known allergy to yeast. Pregnant or breastfeeding women and children under 12 should consult a healthcare professional before use. If you have any underlying medical condition, speak to your GP or pharmacist first.

Can I take Bio-Kult S. Boulardii with antibiotics?

Yes — this is actually one of the most common reasons people take it. Because S. boulardii is a yeast, it is not killed by antibiotics, unlike bacterial probiotics. Taking it alongside an antibiotic course can help reduce the risk of antibiotic-associated diarrhoea, which the NHS notes is a common side effect of many antibiotics. Continue taking it for at least a week after finishing the antibiotic course.

How long should I take Bio-Kult S. Boulardii for?

Duration depends on why you are taking it. For antibiotic-associated diarrhoea, take it throughout the antibiotic course and for one to two weeks afterwards. For travel diarrhoea prevention, start a few days before departure and continue for the duration of your trip. For general gut support, it can be taken on an ongoing basis, though it is worth reviewing this with your pharmacist periodically.

Does Bio-Kult S. Boulardii need to be refrigerated?

No — one of the practical advantages of this product is that it does not require refrigeration. Store it below 25°C in a cool, dry place away from direct sunlight. This makes it particularly convenient for travel, as you can pack it in hand luggage without needing a cool bag or ice pack.

Is Bio-Kult S. Boulardii suitable for children?

The product is primarily formulated for adults. If you are considering it for a child under 12, you should speak to your GP or pharmacist before use. For children who can swallow capsules or have the contents mixed into food, the dose would typically be lower than the adult recommendation — always seek professional guidance first.

What happens if I miss a dose of Bio-Kult S. Boulardii?

If you miss a dose, simply take it as soon as you remember — unless it is nearly time for your next dose, in which case skip the missed one and carry on as normal. Do not double up to compensate for a missed capsule. Missing the occasional dose is unlikely to significantly affect the overall benefit of the supplement.

Can Bio-Kult S. Boulardii help with IBS symptoms?

Some people with irritable bowel syndrome find that probiotic supplements help manage symptoms such as bloating and irregular bowel habits, though the evidence is mixed and individual responses vary. The NHS notes that some people with IBS find probiotics helpful, but recommends trying them for at least four weeks to assess benefit. You can also explore our IBS and cramps range for additional support options.

What are the alternatives to Bio-Kult S. Boulardii?

Alternatives include other Saccharomyces boulardii-containing products or multi-strain bacterial probiotics such as those containing Lactobacillus rhamnosus GG. However, bacterial probiotics are not antibiotic-resistant, so they are less suitable for use alongside antibiotics. For diarrhoea management, oral rehydration salts are also recommended by the NHS to prevent dehydration.

Can I take Bio-Kult S. Boulardii if I am pregnant?

There is limited clinical data on the use of S. boulardii during pregnancy. As a precaution, you should consult your GP or midwife before taking any new supplement while pregnant or breastfeeding. They can help you weigh up the potential benefits against any theoretical risks in your specific situation.

What does the latest research say about Saccharomyces boulardii?

Clinical research continues to support the use of S. boulardii for reducing the duration and severity of acute diarrhoea, including antibiotic-associated and traveller's diarrhoea. Studies have also explored its potential role in Clostridioides difficile infection management and inflammatory bowel conditions, though more large-scale trials are needed. If you're also managing related digestive issues, our diarrhoea range includes additional products that may help.

How Should You Use Bio-Kult S. Boulardii?

Bio-Kult S. Boulardii capsules are taken orally. They are straightforward to use, but following the steps below will help you get the most from the supplement and protect the live yeast from being damaged during administration.

Do not mix the capsule contents with hot food or drinks, as heat can damage the live yeast and reduce its effectiveness.

What Is the Correct Dose of Bio-Kult S. Boulardii?

The recommended dose varies depending on why you are taking the supplement. Always follow the label instructions or the advice of your pharmacist. The table below provides a general guide based on common indications.

When Is the Best Time to Use Bio-Kult S. Boulardii?

For antibiotic-associated diarrhoea, start taking Bio-Kult S. Boulardii at the same time as your antibiotic course begins — do not wait until symptoms appear. For travel diarrhoea prevention, begin taking the capsules two to three days before your departure date and continue throughout your trip. Consistency is key: taking the supplement at the same time each day helps you build a routine and reduces the chance of missing a dose.

How Long Can You Use Bio-Kult S. Boulardii For?

For antibiotic-associated diarrhoea, continue taking the supplement for the full duration of the antibiotic course and for at least one to two weeks afterwards to allow gut flora to re-establish. For travel use, continue for the duration of your trip. For ongoing gut support, the supplement can be taken long-term, but it is sensible to review this periodically with your pharmacist to ensure it remains appropriate for your needs. If symptoms persist or worsen despite supplementation, seek medical advice promptly.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Bio-Kult S. Boulardii?

Bio-Kult S. Boulardii is generally well tolerated by most people. The most frequently reported side effects are mild and digestive in nature, typically occurring in the first few days of use as the gut adjusts to the introduction of the live yeast. These usually resolve on their own without any need to stop the supplement.

  • Bloating
  • Flatulence (wind)
  • Mild abdominal discomfort or cramping

What Are the Less Common Side Effects of Bio-Kult S. Boulardii?

Less commonly, some people may experience the following. If any of these persist or feel severe, stop taking the supplement and speak to your pharmacist or GP.

  • Nausea
  • Constipation
  • Skin rash or itching — which may indicate a mild allergic reaction
  • Headache

What Are the Serious Side Effects of Bio-Kult S. Boulardii?

Serious side effects are rare but can occur in specific high-risk groups. In severely immunocompromised individuals or those with a central venous catheter, there is a small but documented risk of fungaemia — where the yeast enters the bloodstream. This is why the product is not recommended for these groups without prior medical supervision. Signs of a serious allergic reaction (anaphylaxis) include swelling of the face, lips, or throat, difficulty breathing, or a sudden drop in blood pressure. If you experience any of these, call 999 immediately.

What Should You Do If You Experience Side Effects?

For mild side effects such as bloating or wind, try taking the capsule with food rather than on an empty stomach, and ensure you are drinking enough water throughout the day. If symptoms are persistent or you are concerned, stop taking the supplement and contact your pharmacist. Do not ignore symptoms that feel unusual or disproportionate — your pharmacist can help you decide whether to continue, reduce the dose, or stop altogether.

Can Bio-Kult S. Boulardii Interact With Other Medicines?

The most clinically relevant interaction is with antifungal medicines such as fluconazole or itraconazole. These drugs are designed to kill yeasts, and they can significantly reduce or eliminate the effectiveness of S. boulardii if taken at the same time. If you are prescribed an antifungal, speak to your pharmacist before continuing with this supplement. No significant interactions have been identified with antibiotics, as S. boulardii is naturally resistant to them. Always inform your pharmacist of all medicines and supplements you are taking.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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