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 is the only UK company to do 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

  • Hi, i have been suffering from a chronic yeast infection caused by the pill for the past year. Recently, after so much researching I have learned that probiotics could help the situation. Together with other medication, I started having your probiotics for women. My question is, would the saccharomyces boulardii work fine too? As my pharmacist did not have the women one today and gave me these instead.
    Thanks so much

  • Hi Jade,

    Thank you for your question, we will be in touch directly.

    Kerry

  • Hi,
    I was wondering if you can advise about the use of boulardii in case of resistant Ecoli UTI infection ? Thank you so much

    Best
    Amelia

  • Hi,

    My son was give a strong antibiotic ciprofloxacin and codine. He became very anxious and depressed whilst taking it and had to stop. I have been giving him Optibac probiotics (5 billion live cultures - bifidobacterium lactis BB-12, with Fructooligosaccharide fibres). But have just read an article that suggests he should be taking Saccharomyces boulardii. Could you give me some advice please, which would be best, can he take both and for how long. Article I read suggested that the gut is damaged for a year. http://blog.designsforhealth.com/si-42214/one-course-of-antibiotics-can-alter-the-gut-microbiome-for-an-entire-year-0?#

    Thank you

  • My GP thinks I have overgrowth of intestinal flora causing digestive problems. If I take a pro-biotic, will it make it worse?

    Best,
    S

  • Does it contain living yeast? Can it stop loose motions?

  • Hi Amelia, Kathy, Sally and Susmita,

    I will respond individually and directly to you.

    Many thanks for leaving a comment.

    Kerry.

  • 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.
    http://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.

    I'll reply to you directly about this.

    Best wishes,
    Kerry

  • Hello! I've been suffering from a yeast overgrowth for some time now ... at least two years. I have ended up with significant food intolerances and eat just 20 foods to manage the worst of my symptoms. I have been recommended a US product by a nutritional therapist but am wondering whether saccharomyces boullardi might be a good option? Many thanks

  • Response from OptiBac Probiotics

    Dear Annie,

    Thank you for your question.
    I'll email you directly with my thoughts on your query.

    Best wishes,

    Kerry
    Customer Care and Nutritional Advisor
    OptiBac Probiotics

  • Hi will saccharomyces boulardii cause diarrhoea?

  • Response from OptiBac Probiotics

    Dear Pamela,

    Thank you for your question.
    I'll reply to you directly about this subject.

    Kind regards,

    Kerry

  • Hi! About a month ago, my sister was hospitalized for 8 days with a raging bacterial infection, staph aureus, that penetrated her chest wall and was in her clavicular muscle / joint and possibly around her sternum, according to the infectious disease doctor she saw last week. In hospital she was put on IV antibiotic, and they also had to drain the abscess. She was then given a week of oral antibiotics. Within 3 days, the infection recurred — she is now going to an IV clinic to get IV antibiotics once a day, and it will be a full month of these once a day IV antibiotics.

    A friend of mine who had antibiotics got C difficil. He was put on S boulardi. Is S boulardi recommended for my sister, to prevent her from getting C difficil while on such a lengthy course of antibiotics? Thanks!

  • Response from OptiBac Probiotics

    Hi Sandy,

    Thank you for your query.

    I'll respond to you about this directly.

    Kind regards,

    Kerry
    Nutritional Advisor
    OptiBac Probiotics

  • 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

  • I have supported with hand & foot psoriasis for years progressively getting worse. I have read that these can be caused by candida in the stomach. I have eliminated dairy & sugar. I take probiotics every day, would this strain be more beneficial for myself.
    Thanks for your time & help

  • Response from OptiBac Probiotics

    Dear Tina,

    Thank you for your question.

    I'd like to reply to your directly, so will send you a personal reply.

    Warm wishes,

    Kerry

  • Hi.
    I am currently taking the Every day probiotics but I am suffering from Candida. Will it better to take Saccharomyces to help it go? Also should I adhere to an anti-candida diet alongside these or will they still work whilst eating bread/sugar?
    Thanks

  • Response from OptiBac Probiotics

    Dear Sady,

    Thank you for your questions - I will send you a personal response directly.

    Kind regards,

    Kerry

  • Hello.

    Can S. boulardii cause diarrhea initially and if so how long is this likely to last?

  • Response from OptiBac Probiotics

    Dear Dani,

    Thank you for your question.

    I'm going to send you a direct reply to this.

    Best wishes,

    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 - I'll send you a personal response.

    Best wishes,

    Kerry

  • Hi - I have diverticulitis and am struggling with recurrent infections and am therefore regularly taking large doses of antibiotics. A friend recommended that I try Saccharomuces Boulardii to reduce my intestinal inflammation. Do you think this will help it or have you other suggestions that may be more helpful?

    Thank you.

  • Response from OptiBac Probiotics

    Hi Ginny,

    Thank you for your comments.
    I'll reply to you directly with some recommendations, but in the meantime, you may wish to check out our FAQ: 'I have diverticulosis: would OptiBac Probiotics be beneficial?'
    http://www.optibacprobiotics.co.uk/faq/i-have-diverticulosis-would-optibac-probiotics-be-beneficial

    Best wishes,

    Kerry
    Customer Care and Nutritional Advisor

  • A stool test revealed I have blastocystis hominis , giardia spp and candida overgrowth.
    I have suffered with severe CFS for years and am now following a paleo type diet.
    I understand I can take metrinadozole (flagyl) or a combination of other antibiotics to attack these parasites but as they wipe out good gut flora I am reluctant to do so.
    Would the S. boulardi help?
    Any other probiotics I need to take and is it good to rotate?
    Thank you

  • Response from OptiBac Probiotics

    Dear Tracey,

    Thank you for your comments.

    We're unable to enter into personal correspondence with our customers on this page, but I'll reply to you directly with some suggestions that I hope you will find helpful.

    With kind regards,

    Kerry
    Customer Care and Nutritional Advisor

  • Hi.
    Wow you seem to be able to respond to everyone so hoping you can help! I seem to yoyo between bladder/UTI infections and recently a Strep A throat infection, conquered with antibiotics, followed almost immediately each time by thrush or painful vaginal soreness without the itching and usual 'thrush' symptoms. I take For Women during bladder problems and the daily probiotic when things really normal. Have just started Sacchromyces boulardii in a desperate attempt to not re visit my GP for what feels like another infection. I'm in process of having some tests for hormone imbalance and immunity issues but is SB a good option for this. Very confused and just wanting relief. Can't seem to find a huge amount about SB other than it is a beneficial yeast that doesn't interact with anything else. How quickly could it help, I only started yesterday. Help! Thank you so much .....

  • Response from OptiBac Probiotics

    Hi Amanda,

    We do try to offer a reply to all of the people who take the time to leave their comments, although we're not able to offer personal responses on this page.

    I will email you directly with some recommendations that you might find helpful, however.

    With best wishes,

    Kerry,

    Customer Care and Nutritional Advisor

  • 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?’
    http://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