Saccharomyces boulardii (S. boulardii or S.B. for short, and pronounced Sack-a-row-my-sees boo-lar-dee), is a microorganism which differs greatly from the well-known probiotic species such as acidophilus. Saccharomyces boulardii is actually a natural yeast, originally extracted from the lychee fruit.

This microorganism is understood to be a transient; meaning that it passes through the system without binding to the gut wall lining (a sought-after feature in high quality probiotic bacteria). S. boulardii however has undergone years of rigorous clinical research demonstrating not only its safety, but its ability to support digestive health.

OptiBac Probiotics was the first UK company to make a pure Saccharomyces boulardii supplement (which contains 5 billion pure micro-organisms per capsule) and can be found here.

Saccharomyces boulardii can also be found in our supplement For travelling abroad ( which contains 1 billion micro organisms per capsule, combined with other live cultures.)

boulardii
Microscopic image of S. boulardii microorganisms.

In terms of cost per billion microorganisms, Saccharomyces boulardii by OptiBac Probiotics is the best value supplement containing S. boulardii currently available in the UK. To read more about S. boulardii from OptiBac Probiotics, so that you can recommend it with confidence, click here.

The name

Saccharomyces boulardii lends its name to the French scientist, Henri Boulard, who discovered the probiotic yeast in 1923 in South East Asia where he noticed people using the skin of lychee fruit for its beneficial health properties. S. boulardii is often referred to as S. boulardii lyo, where the 'lyo' is short for 'lyophilisation' - a form of freeze-drying which S. boulardii normally undergoes in its supplement form. This process allows the supplement to be shelf-stable so that refrigeration is not necessary. OptiBac Probiotics Saccharomyces boulardii is lyophilised.

For more information on the classification of Saccharomyces boulardii, please read our in-depth article.

Comments

  • Hello,

    I know probiotics are suitable in pregnancy, I am wondering in particular about the Saccharomyces Boulardii strain, is this particular strain suitable in pregnancy?

    I would appreciate a reply as soon as you can.

    Thank you

    Sinéad

    P.S. I am a huge fan of your probiotics.

  • Hi Sinead

    Thanks for your question about Saccharomyces boulardii, and for your great feedback!

    Actually, as a company we've decided not to recommend Saccharomyces boulardii for pregnant and nursing mothers. This recommendation is given primarily based on the lack of related research on its use in pregnancy, rather than because safety issues have been identified. So while there is no evidence to suggest that Saccharomyces boulardii is harmful when used during pregnancy or while breastfeeding, there is also no strong evidence to prove that it is completely safe to use.

    If pregnant women feel that they would specifically like to take S. boulardii whilst they are pregnant, then we advise them to discuss this with their doctor.

    Wishing you and your baby the very best of health,

    Kerry

  • Hi i was wondering if i can take Saccharomyces boulardii probiotic alongside the for every day strain. I suffer from severe IBS and most things i eat cause bloating and discomfort. I have recently started the for every day strain so was wondering if i can incorporate Saccharomyces boulardii too. Any feedback would be appreciated. Thanks

  • I also forgot to mention that i suffer from ibs-c and from all the information i have read it seems saccharomyces boulardii is best for those with ibs-d. Will taking these probiotics make constipation worse

  • I currently suffer from candida. I have heard s.boulardii helps fight off candida. But will i need to be on a strict diet alongside taking these probiotics to fight it off fully? Such as sugar elimination etc? Or will they be just as effective alongside what i usually eat. Thank you

  • Dear Sadia and Zara,

    Thank you for your comments, we will contact you directly.

    Best wishes,
    Kerry.

  • Hi
    I have had CFS/ME for several years now and have gradually deteriorated in terms of ailments.
    Whilst my energy levels are improving and I am beginning to walk, talk and do normal, every day activities like cooking shopping and cleaning with ease, I now find myself googling health issues frequently trying to find out what is happening to me.
    Since having ME, I now have bowel issues (recently having a colonoscopy) nothing nasty but awaiting next consultant visit; possible diverticular ??; I also have Prurigo Nodularis and am really struggling with that. I have Candida or Thrush in my mouth and feel like I am drowning !
    On visiting my sister, we sat down and tried to research as much as we could.
    We came to the conclusion, having done a saliva test in water that I needed to get some Daktarin gel to alleviate the thrush, advice from the chemist. We also discussed the root cause of all these issues which, as you may appreciate, is a mine field.
    We made the decision to buy some probiotics aswell (Kidz Immuno), ....one a day before a meal.
    After several days I am already starting to feel the benefits of this action.
    My only concern was taking probiotics for children so researched alternatives.
    I found....Sacardi, Saccharomyces bollard 5 billion with FOS & Vitamin B.

    Kind regards
    Jane Evans

  • Can you advise whether saccharomyces boulardi is safe to use for a 2 year old please? And also what the adjusted dose would be? Many thanks.

    Alison

  • Hello Alison,

    Thanks for your query regarding the use of S. boulardii in children.
    We recommend the use of this probiotic from the age of 1 year, though some research studies have been conducted on younger children.
    See our 'Research - Saccharomyces boulardii' page.
    https://www.optibacprobiotics.co.uk/scientific-research/saccharomyces-boulardii-research

    In terms of dosage: we would typically recommend not exceeding half the recommended adult dose for those under 12 years of age.

    High doses of Saccharomyces boulardii may cause constipation in some individuals.

    I hope that this information is helpful for you and your patient,

    Kerry

  • Hi can I take this product at the same time as the antibiotic (flucloxicillin 500mg 3times a day)
    Thanks

  • Response from OptiBac Probiotics

    Hi Joan,

    Thank you for your question.

    Yes, you can take antibiotics at the same time as this particular strain.

    Best wishes,
    Kerry

  • Hi will saccharomyces boulardii cause diarrhoea?

  • Response from OptiBac Probiotics

    Dear Pamela,

    Thank you for your question.
    We are unaware of any evidence to suggest S. boulardi causes diarrhoea.

    Kind regards,

    Kerry

  • Hello, I was diagnosed with Blastocystis hominis last year, I took a course of Flagyl that initially seemed to work but then the IBS, bloating, exhaustion came back. I find that if I take one or two saccharomyces boulardi each day then I'm 100% better (they really are a lifesaver for me so thank you). The only problem is that if I don't take the tablets for a few days then all the symptoms come back. Is it OK for me to take the tablets every day long term? Should I be combining these with a regular probiotics? many thanks,

  • Response from OptiBac Probiotics

    Hi Tracey,

    Thank you for your comments - I'll reply to your queries directly.

    Kind regards,

    Kerry
    Nutritional Advisor
    OptiBac Probiotics

  • Hello,

    My nutritionist suggested I take s.boulardi over per day as I am trying to heal my gut on a paleo fodmaps diet. I have cfs, but suffer more from constipation than diarrhoea. will s.boulardi make the constipation worse?

    Also my 8 year old son is on antibiotics at the moment. Is it safe to give him s.boulardi.? He is currently taking a broad spectrum probiotic I got in the local healthstore. Is it safe to add in s.boulardi?

    Kind regards
    Nuala

  • Response from OptiBac Probiotics

    Dear Nuala,

    Thank you for your query, which I will reply to directly in order for me to give you a more personal response.

    Kind regards,

    Kerry
    Nutritional Advisor
    OptiBac Probiotics

  • Hello, I recently took a lemon water enema and started to supplement myself with s. boulardii 250mg 2x a day because i got this from my drugstore when i asked about a probiotic. its been 3 days since the enema and I am constipated since, can it be the drugs fault? should I stop taking it or continue to do so?
    Many thanks,
    Tian

  • Response from OptiBac Probiotics

    Dear Tian,

    Thank you for your question.
    I'll send you a personal response shortly.

    Kind regards,

    Kerry

  • If on long term antibiotic for Lyme, can I take s.b. daily with the antibiotic for more than 6 months at a time?

  • Response from OptiBac Probiotics

    Hi Michelle,

    Thanks for your question. You can take Saccharomyces boulardii with antibiotics, and there is no evidence to suggest any issues with taking S. boulardii long term. In fact, many of our customers do so for months or years.
    Best wishes,

    Kerry

  • Is your S. boulardii supplements safe for pets? Have been advised to use as a treatment to prevent recurrent C. diff in our cat.

  • Response from OptiBac Probiotics


    Hello Kelly,
    Thanks for your question.

    Aw, I’m so sorry about your poorly cat; as a cat-owner and lover myself I know how upsetting it can be when our feline friends are not well!

    Firstly, however, I have to advise you that our products are not tested for use in animals and so we can’t specifically recommend them for this purpose; the strength of our range is based on the results of extensive human clinical trials and so we have no evidence to indicate how they would work in animals.

    Therefore I’d usually suggest that it is best to choose a product that has been specifically tested for animal use, as animal probiotics are certainly widely available, so it is worth asking your vet for advice on specific probiotics. My own vet is certainly very interested in probiotic therapy for animals, along with more natural, specific raw food and grain free diets etc. to further help to support pets’ digestion in an appropriate way.

    Like doctors, vets can vary in their willingness to embrace ‘alternative’ supplements, though in my experience probiotics are widely-used in animal care - see our blog: ‘Could S. boulardii make pigs less stressed?’
    https://www.optibacprobiotics.co.uk/blog/2016/06/could-s-boulardii-make-pigs-less-stressed
    Anecdotally, we also hear of many people who administer our probiotics to their animals with positive results, and certainly some of the species of beneficial bacteria are common to both human and animal probiotic products.

    Ultimately, however, I can’t advise you to use any of the products for your cat, and I’d have to refer you back to your vet or a practitioner qualified in veterinary medicine.

    Wishing you and your cat the best of health,

    Kerry
    Customer Care and Nutritional Advisor

  • I have had diarrhea for 3 mos no pain just loose BM. I have been using pro-biotics 32 strains but maybe not the appropriate strains. My foot psoriasis went away but not my diarrhea. Also using oil of oregano and yesterday just started taking raw apple cider vinegar and today first BM with some form. Will the S.B. help?

    Thank you

  • Hi, I also wanted to know whether I can treat a yeast infection with this probiotic? I am breast feeding but have taken acidophilus and bifidophilis and all the creams and pessaries so really need something else to try!
    Thanks

  • Response from OptiBac Probiotics

    Dear Jess,

    Thank you for your question.
    You'll see from some earlier queries that our current guidelines exclude the use of S. boulardii during pregnancy or whilst breastfeeding.

    This recommendation is based solely on the lack of related research on the use of this probiotic in pregnancy, rather than because safety issues have been identified. So while there is no evidence to suggest that Saccharomyces boulardii is harmful when used during pregnancy or while breastfeeding, there is also no strong evidence to prove that it is completely safe to use.

    If pregnant women feel that they would specifically like to take S. boulardii whilst they are pregnant, then we advise them to discuss this with their doctor.

    To help with vaginal yeast infections, you'd want to look for a probiotic that contains strains of bacteria known to colonise in the intimate area.

    With kind regards,

    Kerry
    Customer Care and Nutritional Advisor

  • Hi,

    My 14 year has IBS and he has been taking buscapan and laperamide for years now. I been told by his new GP that I should try this as well.

  • Looking at taking this alongside my daily probiotic. Is it ok to take in addition to my daily probiotic?

  • Response from OptiBac Probiotics

    Hi Melanie,

    Thank you for your comment.

    It’s fine to take any of our probiotics alongside other probiotics as necessary.

    I hope this has answered your question, please let me know if you’d like any further information.

    Kind regards,

    Naomi

  • Hello
    Is it taken before during or after food? i.e. on an empty stomach?

  • Response from OptiBac Probiotics

    Hello Eve,

    Thank you for your comments.
    You can take S. boulardii with or without food, at any time of day.
    You can find out more about how to take all of our products by taking a look at our FAQ: At what time, and how, should I take probiotics?
    https://www.optibacprobiotics.co.uk/faq/at-what-time-should-i-take-probiotics

    Hope this is helpful,
    Kerry,

    Customer Care and Nutritional Advisor

  • Hi!
    I have intolerance to S. cerevisiae. I am wondering is it possible the S. boulardii makes an intolerance to my body too, because it is the same species? Thanks!

  • Response from OptiBac Probiotics

    Hello Danny,

    Thanks for your questions.

    Whilst it's often used to help rebalance an overgrowth of pathogenic yeasts such as those from the Candida family, if you have a known yeast allergy or intolerance, then you would need to be cautious about taking S. boulardii. It is a yeast and is classified as a member of the S. cerevisiae family of yeasts, though it is certainly very different in its nature.

    For more about this, see our in-depth article: Classification of Saccharomyces boulardii
    https://www.optibacprobiotics.co.uk/live-cultures/articles/classification-of-saccharomyces-boulardii

    There are many different types of yeast, and it is possible to be sensitive to some types of yeast and not others, though we'd have to err on the side of caution and tell you to avoid S. boulardii if you have a yeast sensitivity. You're best to get further advice from a health professional who can organise the appropriate tests, help you to manage your diet to avoid foods containing yeasts, help you to manage your intolerance and find out if there are any underlying causes which could be addressed.

    See www.bant.org.uk or www.cnhc.org.uk to find a practitioner who can help to support you.

    Best wishes,

    Kerry
    Customer Care and Nutritional Advisor

  • Hi,

    I know this question has previously been asked but I couldn't see the answer posted publicly, only privately. Like others I was jsut wondering if you can take this product alongside the 'Every Day Probiotic'?

    Georgina

  • Response from OptiBac Probiotics

    Hello Georgina,

    Thank you for your question.

    In short, the answer to your question is 'Yes!' You can take any of our product range in combination, according to your individual needs, so it would be fine to take Saccharomyces boulardii along with any of our other products. For more information, see our FAQs:
    Can I take two OptiBac supplements at the same time?
    www.optibacprobiotics.co.uk/faq/can-i-take-two-optibac-probiotics-supplements-at-the-same-time
    At what time, and how, should I take probiotics?
    https://www.optibacprobiotics.co.uk/faq/at-what-time-should-i-take-probiotics

    i hope that this information is helpful.

    Best wishes,

    Kerry
    Nutritional Advisor

  • I've got a food intolerance to yeast and was wondering if this product will be ok as it's yeast? I'm assuming it is and it's different type of yeast?

  • Response from OptiBac Probiotics

    Dear Ashley,

    Thank you for your question.

    Like different strains of bacteria, it is true that not all yeasts are the same or have the same properties. Some, like the Candida family, are natural residents of the body, but can become a problem and are considered to be a pathogen if conditions are suitable for them to grow out of control. In these cases, the body often produces antibodies to yeasts which may show up in tests as an allergy.

    Those with a yeast allergy usually have to avoid all foods which contain yeasts too.
    Saccharomyces cerevisiae is perhaps the most common yeast used in food production – it’s also known as Brewer’s Yeast. Our Saccharomyces boulardii is thought to be a strain of the S. cerevisiae family and is currently classified as such, but still has different properties in the body. It is transient and does not take up residence in the body, and actually has strong anti-fungal properties that can help to displace pathogens such as Candida.

    It’s possible for people to have allergies or sensitivities to certain types of yeasts and not others, but if you do have a known allergy to all yeasts, then we have to advise you not to take S. boulardii, as it is a yeast.

    With kind regards,

    Kerry



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