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Bio-Kult S. Boulardii is scientifically developed to target both your immune system and your digestive tract. Our advanced multi-strain formulation supports the balance of microorganisms in the gut and contains vitamin D3 to contributes to normal functioning of the immune system. Working in your defence.

Adults and children 12+: Take up to 2 capsules daily, with food.

Children 3-11: Give 1 capsule daily, with food.

*If you are taking any medications, have any medical conditions, are pregnant, or planning a pregnancy, please consult your doctor before taking any food supplement.

Do not exceed recommended daily intake. Food supplements should not be used as a substitute for a varied diet and a healthy lifestyle.

  • Gluten free and Vegetarian
  • No artificial colours or flavours
  • Can be stored at room temperature without the need for refrigeration, just make sure you keep me cool, dry and out of direct sunlight.
  • Live yeast culture, Saccharomyces boulardii
  • Vitamin D3 contributes to the normal functioning of the immune system
  • Formulated in the UK by our Bio-Kult scientists
  • Backed by clinical research

S. boulardii is not part of the intestinal microbiota of humans and under normal conditions it doesn't permanently colonise the gastrointestinal tract. When given orally, it achieves steady-state concentrations within 3 days and is cleared within 3-5 days after it is discontinued. No specific safety concerns have been raised in respect of longer-term use; however, studies using S. boulardii have typically lasted between 7 days and 6 months*.

* McFarland, LV; (2010) World J. Gastroenterol. 16(18): 2202-22.

Example Serving size: 2 capsules

'500mg yeast microorganisms per 2 capsules (5 billion CFU).

Nutritional Table Amount per 2 capsules Nutrient Reference Value
Vitamin D 6mcg 120%


Ingredients:

Live yeast culture, fuctooligosaccharide (FOS) and gum acacia, vitamin D3 (cholecalciferol), vegetable capsule (hydroxypropyl methylcellulose).

Live yeast culture:

Saccharomyces boulardiiCNCM I-3799

Preplexis a combination of fructooligosaccharide(FOS) and gum acacia

May contain milk.

Milk is not used in the manufacturing of Bio-Kult S. Boulardii. However, milk is used in the manufacturing of other products in the Bio-Kult range produced at our manufacturing facilities. Allergen testing for Bio-Kult S. Boulardii has shown low levels of casein (milk protein) and may be in the final product. Bio-Kult Boulardii therefore 'may contain milk' and is not recommended for those with an allergy to milk proteins.

Swallow our capsules whole or sprinkle into your cool food or drink.

Take me:

  • Every day
  • Alongside antibiotics
  • When travelling
  • As part of a healthy lifestyle

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Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are and do not represent the views of The Hut Group.

Seems to help with IBS symptoms

5 stars out of a maximum of 5

Hard to know exactly what's working and what isn't with IBS. However, when I began taking Bio-kult S. boullardi my IBS-D symptoms improved around 90%.

2025-10-20by Kate**Verified Purchase**

Efficient

5 stars out of a maximum of 5

This helped me with a stomach virus.

2025-05-12by Izabela**Verified Purchase**

Game Changing!

5 stars out of a maximum of 5

One by one, my family and friends have all started taking these wonder-tablets. After many years of nausea and sickness due to stomach problems, trying all medical tests and treatments, my Mother was cured by these tablets. They have been a game changer for everyone I know. 

2023-06-07by Angela**Verified Purchase**

Game changer!

5 stars out of a maximum of 5

I had been struggling for some months with various problems, reflux, bloating and stomach problems, I had various tests and everything was coming back negative, nothing was helping to relieve the symptoms either. I was talking to a friend who told me about Bio Kult and how it had helped her mum with diverticulitis and went on to explain good gut health. She ran round with a box of bio kult that day and all my symptoms disappeared overnight and I have not had a flare up since. It really did change everything for me, I am no longer in constant discomfort and I am sleeping at night. I would recommend this to anyone, I have also got my partner to take them who has had a recent diagnosis of colitis and they have helped to relieve some symptoms. 

2023-05-17by Sam**Verified Purchase**

Life Changing

5 stars out of a maximum of 5

These little miracle workers saved my mother from years of sickness; the doctors tried everything, nothing worked until a dietician suggested these.She’s a changed woman! I started taking them too and I feel so much healthier. More recently a couple, close friends, asked me what my Mum now takes as they were having gut problems. I gave them each a box of these and they are both cured & will be sticking with these S.Boulardii too! Thank you Bio-Kult!

2023-04-08by Angela**Verified Purchase**

Amazing

5 stars out of a maximum of 5

Amazing

2020-05-25by Valentina**Verified Purchase**