Saccharomyces Boulardii with Prebiotic MOS

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Swanson Saccharomyces Boulardii with Prebiotic MOS is specially designed for foreign travelers, but it's great for anyone concerned about gastrointestinal stability. Saccharomyces boulardii is a probiotic yeast that survives stomach acid to nourish the intestines, support the immune system and protect the beneficial bacteria that keep you healthy and comfortable. Our Saccharomyces Boulardii with Prebiotic MOS formula is stable at room temperature, making it easy to take with you. Plus, it can be taken with bacterial probiotics and won't interfere with other supplements, so everyone can take it with confidence.


Supplement Facts

Serving Size 1 Vegan Capsule

Servings Per Container 30

Amount Per Serving % Daily Value
Saccharomyces boulardii (5 billion CFU†, a subspecies of S. cerevisiae) 250 mg *
MOS (Manno-oligosaccharides) 80 mg *

*Daily Value not established.
†Contains 5 billion CFU (colony forming units) when manufactured.

Other Ingredients: Hypromellose (vegan capsule), microcrystalline cellulose (plant fiber), rice extract blend, silica.

Suggested Use: As a dietary supplement, take one vegan capsule with water between meals. May take up to three capsules per day.

Warning: For adults only. Consult your healthcare provider before using this or any product if you are pregnant or nursing, taking medication or have a medical condition.

Storage Instructions: Keep out of reach of children. Do not use if seal is broken. Store in a cool, dry place.




  1. What Is Saccharomyces boulardii and What Are Its Benefits?
    Saccharomyces boulardii is a beneficial probiotic yeast that helps support digestive and gastrointestinal wellness. Unlike many probiotics that are bacteria, Saccharomyces boulardii is a yeast strain that supports a healthy balance of microorganisms in the digestive tract. It is commonly used to support digestive health, gut microbiome balance, and overall gastrointestinal function as part of a daily wellness routine.
  2. How Is Saccharomyces boulardii Different From Other Probiotics?
    Most probiotic supplements contain beneficial bacteria from groups such as Lactobacillus or Bifidobacterium, while Saccharomyces boulardii is a beneficial yeast. Because it is a different type of microorganism, it offers a unique approach to supporting digestive and gastrointestinal wellness. Many people choose Saccharomyces boulardii as part of a comprehensive probiotic regimen or as a standalone probiotic supplement.
  3. What Is a CFU in Saccharomyces boulardii Supplements?
    CFU stands for Colony Forming Units, a measurement used to indicate the number of viable probiotic microorganisms in a supplement. In Saccharomyces boulardii products, the CFU count represents the amount of beneficial probiotic yeast provided per serving. CFUs help consumers understand the potency of a probiotic supplement and the quantity of live microorganisms it delivers.
  4. Has Saccharomyces boulardii Been Clinically Studied?
    Yes. Saccharomyces boulardii is one of the most extensively studied probiotic yeast strains and has been the subject of numerous clinical studies. Research has explored its role in supporting digestive health, gastrointestinal wellness, and a healthy balance of microorganisms in the digestive tract. Because formulations and CFU counts can vary, always follow the suggested serving size on the product label when using a Saccharomyces boulardii supplement.
  5. Is Swanson Saccharomyces boulardii Suitable for Special Diets?
    Yes. Swanson Saccharomyces boulardii is vegan and made with non-GMO ingredients, making it a convenient choice for individuals seeking a probiotic supplement that aligns with these dietary preferences. Always review the product label for the most current ingredient, allergen, and dietary information before use.