Best Saccharomyces Boulardii Supplements (2026) – Top 10 Reviewed
Saccharomyces boulardii is a beneficial probiotic yeast that stands apart from typical bacterial probiotics. This hardy organism survives stomach acid, resists antibiotics, and provides unique benefits for digestive health. Whether you’re dealing with occasional diarrhea, traveling, or taking antibiotics, S. boulardii can help maintain healthy gut flora and digestive function. Here are the best Saccharomyces boulardii supplements available on Amazon.
Our Top Picks at a Glance
- Best Overall: NOW Saccharomyces Boulardii – Quality brand with 5 billion CFU per serving
- Best Value: Carlyle S. Boulardii – 200 capsules with 10 billion CFU
- Best Premium: Florastor Probiotics – Clinically studied strain with decades of research
Quick Comparison
| Product | CFU Per Serving | Form | Servings | Best For |
|---|---|---|---|---|
| NOW S. Boulardii 60ct | 10 Billion | Capsules | 30 | Quality and purity |
| Carlyle S. Boulardii | 10 Billion | Capsules | 100-200 | Best value |
| BARE & BETTER S. Boulardii | 10 Billion | Capsules | 200 | Long-term supply |
| Klaire Labs Ther-Biotic | 5 Billion | Capsules | 60 | Professional quality |
| Optibac S. Boulardii | 5 Billion | Capsules | 40 | Vegan formula |
| Biotics Research S. Boulardii | 4 Billion | Capsules | 60 | Temperature-stable |
| Klaire Labs Powder | 9-45 Billion | Powder | Varies | Flexible dosing |
| Generic S. Boulardii 240ct | 3 Billion | Tablets | 240 | Budget-friendly |
1. NOW Saccharomyces Boulardii – Best Overall
- PROBIOTIC 5 BILLION CFU: Supports a healthy balance of intestinal flora*
- USEFUL WHEN TRAVELING*: For occasional diarrhea*
- REFRIGERATION RECOMMENDED: Refrigerate as soon as item is delivered to maintain shelf life through the 2-year best by date listed on bottom of bottle.
- GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation)
- Packaged in the USA by a family owned and operated company since 1968
A trusted supplement brand delivers quality S. boulardii with organic prebiotic support.
NOW Foods provides 10 billion CFU of Saccharomyces boulardii per two-capsule serving, enhanced with organic inulin (FOS) as a prebiotic fiber. This probiotic yeast survives stomach acid and colonizes the intestinal tract to promote healthy gut flora balance. The formula supports proper gastrointestinal function during temporary disruptions like travel or antibiotic use.
What We Like
- Reputable brand with quality testing standards
- Includes organic prebiotic inulin for enhanced effectiveness
- Room temperature stable for convenience
- Free from wheat, gluten, soy, milk, egg, fish, and shellfish
What Could Be Better
- Only 30 servings per bottle versus larger options
- Two capsules required per serving
Bottom Line: An excellent choice for reliable S. boulardii supplementation with the added benefit of prebiotic fiber.
2. Carlyle Saccharomyces Boulardii – Best Value
- PROBIOTIC FORMULA: Features Saccharomyces boulardii with 10 Billion CFUs per serving**
- CONVENIENT SUPPORT: Vegetarian capsules are an excellent addition to your daily routine
- ROOTED IN WELLNESS: Carlyle provides premium, honest supplements in your pursuit to healthy living
- CARLYLE MANUFACTURERS: Laboratory Tested, Trusted Ingredients, Superior Quality, 100% Guaranteed!
- NATURALLY FREE OF: Gluten, Wheat, Lactose, Soy, Artificial Flavor, Preservatives & Non-GMO
Get exceptional value with 200 capsules delivering 10 billion CFU per serving.
Carlyle provides 500 mg of S. boulardii per serving with 10 billion CFU at the time of manufacture. This gluten-free, non-GMO formula contains no artificial colors or preservatives. The generous 200-capsule supply offers excellent value for long-term supplementation or intensive use during digestive challenges.
What We Like
- Exceptional value with 200-capsule supply
- High potency at 10 billion CFU
- Non-GMO and gluten-free formulation
- No artificial ingredients or preservatives
What Could Be Better
- Less well-known brand than some competitors
- No prebiotic fiber included
Bottom Line: An outstanding value option for those wanting a large supply of quality S. boulardii at an affordable price.
3. BARE & BETTER Saccharomyces Boulardii – Best Long-Term Supply
- DIGESTIVE & IMMUNE BOOST: Each capsule contains 250mg of the probiotic saccharomyces boulardii.
- VALUE PACK — 200 count: Enjoy peace of mind, knowing you’re stocked for over three months, so you don’t have to constantly remember to order more.
- GLUTEN AND LACTOSE FREE: Suitable for special diets.
- NO REFRIGERATION NECESSARY: Convenience first — keep your probiotics on-hand at work or on the go.
- 100% SATISFACTION GUARANTEE: We stand by our product 100%. Not happy? Full money-back guarantee. No questions asked.
Stock up for over three months with this 200-count value pack.
Each capsule delivers 250 mg of S. boulardii providing 10 billion CFU per serving. The gluten and lactose-free formula requires no refrigeration, making it convenient for home or travel. With 200 capsules per bottle, you won’t need to constantly reorder, ensuring consistent supplementation.
What We Like
- 200-count bottle provides over 3 months supply
- Gluten and lactose-free for dietary restrictions
- No refrigeration necessary
- 100% satisfaction guarantee
What Could Be Better
- Newer brand with less market presence
- Basic formula without additional ingredients
Bottom Line: Perfect for those who want to stock up and maintain consistent S. boulardii supplementation without frequent reordering.
4. SFI Health Klaire Labs Ther-Biotic S. Boulardii – Best Professional Formula
- Comprehensive Support - High-potency saccharomyces boulardii delivering 5B CFU to support digestive health, gut health, and acting as a daily probiotic for overall health and wellness.
- Gut and Bowel Support - Designed to promote balanced microbiome function, support normal bowel movements, and complement probiotics for women & men seeking digestive balance.
- Improved Immune and Intestinal Function - Supports a healthy inflammatory response and intestinal immune activity associated with occasional digestive discomfort and diarrhea relief needs.
- How to Use - Take one capsule daily or as directed by your healthcare professional to support gut health, digestive health, and consistent bowel movement support.
- Klaire Labs is Now SFI Health - Klaire Labs has been part of the SFI Health family for many years leading the way in efficacy, safety, quality, and trusted by healthcare practitioners. While we might be changing the way things look, rest assured that our formulations and probiotics for gut health remain the same.
Professional-grade S. boulardii trusted by healthcare practitioners.
This formula provides comprehensive digestive and immune support with S. boulardii, a unique probiotic yeast that promotes digestive balance and enhances bowel function. The acid-resistant, temperature-tolerant organism is unaffected by antibiotics and distinct from brewer’s yeast or Candida species. Clinical studies show it supports healthy bowel transit and intestinal immunity.
What We Like
- Professional-grade quality from trusted SFI Health/Klaire Labs
- Acid-resistant and antibiotic-resistant strain
- Supports intestinal immunity by increasing secretory IgA
- Temperature-tolerant and shelf-stable
What Could Be Better
- Premium pricing reflects professional quality
- Lower CFU count than high-potency options
Bottom Line: A practitioner-grade option delivering reliable S. boulardii with clinically proven benefits for digestive and immune health.
5. Optibac Saccharomyces Boulardii – Best Vegan Formula
- EXTREMELY WELL-RESEARCHED - One of the most studied live cultures in the world, with over 50 years of research in over 100 scientific studies including thousands of children and adults.
- SCIENTIFICALLY PROVEN - Saccharomyces boulardii is a highly-researched, internationally acclaimed strain of friendly yeast, proven to reach the gut alive and complement the body’s natural bacteria.
- EASY-TO-USE - No need for refrigeration, making this supplement suitable to take with you wherever you go. Suitable from 1 year+ and for daily use, S. Boulardii can be taken intensively or on a long-term basis. Can be taken alongside supplements or medicines for diarrhoea and IBS.
- A VEGAN, MORE NATURAL CHOICE - This digestive supplement is vegan, dairy-free & free from added sugar, artificial colours or preservatives. Gluten-free and therefore may be suitable for those with coeliac disease.
- GREENER PACKAGING - Comes in a recyclable FSC-certified carton and glass jar, ideal for those looking to cut down on plastic.
Internationally acclaimed strain in a vegan, eco-friendly formula.
Optibac guarantees 5 billion live probiotic cultures in every capsule of their scientifically proven S. boulardii strain. Used for over 50 years to support optimal gut health, this formula is vegan, gluten-free, dairy-free, and free from added sugar or artificial ingredients. The recyclable FSC-certified packaging reflects their environmental commitment.
What We Like
- Internationally acclaimed strain with 50+ years of use
- Vegan and free from all major allergens
- Scientifically proven to reach gut alive
- Eco-friendly recyclable packaging
What Could Be Better
- Only 40 capsules per bottle
- Higher price per serving than bulk options
Bottom Line: An excellent choice for those seeking a vegan, allergen-free S. boulardii supplement with environmental responsibility.
6. Biotics Research Saccharomyces Boulardii – Best Temperature-Stable Formula
- EFFECTIVE TRUE BIOTIC SUPPORT: Saccharomyces boulardii is a potent “biotic” strain, or living organism, that supports gastrointestinal health; A viable yeast that is genetically different from Baker’s yeast, it is dairy-free; It has been shown to have beneficial effects by improving intestinal microbalance
- PROMOTES INTESTINAL AND DIGESTIVE WELLNESS: Saccharomyces boulardii provides 4 billion CFUs per capsule, and has proven beneficial for balancing intestinal microbiology; Saccharomyces boulardii survives stomach acid and is antibiotic resistant; It may also be used when experiencing occasional diarrhea resulting from travel or antibiotic use
- SUPPORTS HEALTHY BALANCED PATHWAYS: Saccharomyces boulardii has been shown to secrete “soluble factors,” which help to promote healthy pathways, and also supports the immune response
- WHO WE ARE: We have revolutionized the nutritional supplement industry by combining “The Best of Science and Nature"; Our focus on research, natural effectiveness, product safety, efficacy, quality control, and ongoing innovation drives our advancements in the field
- QUALITY MADE IN THE USA: We produce tablets, capsules, powders, and liquids in a Texas Department of Health licensed, GMP-certified production and ISO-certified laboratory facility; All products are tested in a state-of-the-art laboratory to ensure safety, efficacy, and purity, and are Gluten Free!
A potent biotic strain supporting gastrointestinal health with proven stability.
This formula delivers 4 billion CFU per capsule of S. boulardii, a viable yeast genetically different from baker’s yeast and dairy-free. It survives stomach acid and is antibiotic-resistant, making it ideal during antibiotic use or for travel-related diarrhea. The supplement secretes soluble factors that help promote healthy pathways and support immune response.
What We Like
- Temperature-stable with proven shelf life
- Survives stomach acid and antibiotics
- Supports healthy immune and digestive pathways
- Dairy-free and distinct from baker’s yeast
What Could Be Better
- Lower CFU count than 10 billion options
- Moderate price point for modest potency
Bottom Line: A reliable, temperature-stable option for maintaining gut health during antibiotic treatment or travel.
7. Klaire Labs Pure Saccharomyces Boulardii Powder – Best Flexible Dosing
- Pure, single ingredient Saccharomyces boulardii powder.
- With a dual scoop for measuring accuracy, this clean-label formulation is particularly effective and uniquely convenient for use in high-potency titration protocols.
- Supplies 9 billion CFU per small scoop & 45 billion CFU per large scoop.
- Hypoallergenic product with none of the following common allergens: milk/casein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, and soybeans. Contains no artificial colors, flavors, or preservatives.
- Trusted by healthcare practitioners since 1969, Klaire Labs products are developed closely with physicians and are intended to be used as directed by a healthcare practitioner.
Customize your dosage with pure S. boulardii powder and dual scoop system.
This single-ingredient powder provides 9 billion CFU per small scoop or 45 billion CFU per large scoop, allowing flexible titration for different needs. The clean-label formulation is hypoallergenic and free from milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, and soybeans. Ideal for high-potency protocols or sensitive individuals who need precise dosing.
What We Like
- Flexible dosing from 9 to 45 billion CFU
- Pure single-ingredient formula
- Hypoallergenic and free from all major allergens
- Can be mixed with water, juice, or food
What Could Be Better
- Powder form may be less convenient for some
- Requires measuring and mixing
Bottom Line: Perfect for those who need flexible, high-potency dosing or prefer powder supplements over capsules.
8. Generic Saccharomyces Boulardii 240 Tablets – Best Budget Option
- DIGESTIVE HEALTH - Saccharomyces boulardii probiotics promotes healthy gut function & immune system. It also supports occasional constipation, diarrhea, gas & bloating
- BACKED BY SCIENCE - Our team of research scientists collect data from credible studies to formulate the optimal probiotic dosage, providing our customers with the best daily support
- 3RD PARTY TESTED - We ensure that all products are tested for safety, potency and identity. We use a leading independent laboratory to carry out all testing for your peace of mind
Maximum quantity at minimum cost with this 240-tablet value pack.
Each tablet provides 3 billion CFU of S. boulardii to support digestive and gut health. The vegan-friendly, gluten-free formula is backed by science and third-party tested for safety and potency. With 240 tablets per bottle, this offers exceptional value for long-term daily supplementation.
What We Like
- 240 tablets provide long-lasting supply
- Budget-friendly pricing
- Vegan, gluten-free, and non-GMO
- Third-party tested for quality
What Could Be Better
- Lower CFU count at 3 billion per tablet
- Generic brand with less market presence
Bottom Line: An economical choice for those who want maximum quantity and don’t need ultra-high potency.
How to Choose the Best Saccharomyces Boulardii Supplement
When selecting a S. boulardii supplement, start by considering the CFU count. Products typically range from 3 to 10 billion CFU per serving. Higher potencies may be beneficial for acute digestive issues or antibiotic use, while moderate doses work well for daily maintenance and prevention.
Examine the strain quality and whether the product uses clinically studied S. boulardii strains like CNCM I-745 or CNCM I-1079. These specific strains have decades of research backing their safety and effectiveness. Look for products that specify their strain identification rather than generic S. boulardii.
Check for additional ingredients like prebiotics (FOS, inulin) that can enhance the effectiveness of S. boulardii. Some formulas include these synbiotic combinations, while others offer pure S. boulardii alone. Consider whether you want added ingredients or prefer a single-ingredient supplement.
Consider the form factor that works best for your lifestyle. Capsules offer convenience and pre-measured doses, tablets may be easier to swallow, and powders allow flexible dosing and can be mixed into beverages or food. Some people find powder forms easier for children or those who struggle with swallowing pills.
Evaluate quality certifications and testing. Look for products that are third-party tested, non-GMO, and free from common allergens. Products manufactured in GMP-certified facilities ensure consistent quality and purity. While S. boulardii doesn’t require refrigeration, proper storage still matters for maintaining potency.
Benefits of Saccharomyces Boulardii Supplements
Saccharomyces boulardii offers unique benefits as a probiotic yeast rather than bacteria. Unlike bacterial probiotics, S. boulardii is naturally resistant to antibiotics, making it ideal for use during antibiotic treatment to prevent antibiotic-associated diarrhea. It survives stomach acid and colonizes the intestinal tract temporarily to provide digestive support.
This beneficial yeast helps maintain healthy gut flora balance during temporary disruptions. It’s particularly effective for travelers dealing with occasional diarrhea, supporting proper gastrointestinal function when your system encounters new bacteria or different foods. Research shows it can reduce the duration and severity of acute diarrhea in both children and adults.
S. boulardii supports intestinal barrier function and helps protect the gut lining. Studies demonstrate it can increase secretory IgA levels and stimulate immunoglobulin receptors in the intestinal tract, supporting immune function at the gut level. This makes it valuable for overall immune health beyond just digestive benefits.
The yeast produces beneficial compounds that support a balanced intestinal environment. It secretes enzymes and other factors that help crowd out harmful organisms while supporting beneficial bacteria. This makes S. boulardii an excellent complement to bacterial probiotics rather than a replacement, offering unique mechanisms of action that work synergistically with other probiotic strains.
Frequently Asked Questions
What is Saccharomyces boulardii?
Saccharomyces boulardii is a beneficial probiotic yeast, not a bacteria like most probiotics. It’s a unique organism genetically different from baker’s yeast or brewer’s yeast that supports digestive health by temporarily colonizing the intestinal tract and promoting healthy gut flora balance.
Can I take S. boulardii with antibiotics?
Yes, S. boulardii is naturally resistant to antibiotics, making it an excellent choice to take during antibiotic treatment. It helps prevent antibiotic-associated diarrhea and maintains gut health when antibiotics are disrupting your normal bacterial balance.
Is S. boulardii good for travelers’ diarrhea?
Yes, research shows S. boulardii is effective for preventing and reducing the severity of travelers’ diarrhea. Taking it before, during, and after travel can help your digestive system handle exposure to new bacteria and different foods in unfamiliar environments.
Does Saccharomyces boulardii need refrigeration?
No, S. boulardii is naturally stable at room temperature and doesn’t require refrigeration. This makes it convenient for travel and daily use without worrying about storage conditions, though you should still store it in a cool, dry place away from direct sunlight.
How long should I take S. boulardii?
For acute issues like antibiotic use or travelers’ diarrhea, take S. boulardii throughout the duration of antibiotics or travel and for several days afterward. For ongoing digestive support, it can be taken long-term as needed, though it doesn’t permanently colonize the gut like some bacterial probiotics.
Can people with yeast sensitivities take S. boulardii?
S. boulardii is generally well-tolerated even by those with yeast sensitivities because it’s a different species from Candida and baker’s yeast. However, people with severe yeast allergies or immunocompromised individuals should consult their healthcare provider before use.
What’s the difference between S. boulardii and regular probiotics?
S. boulardii is a probiotic yeast, while most probiotics are bacteria like Lactobacillus or Bifidobacterium. The key differences are that S. boulardii is antibiotic-resistant, doesn’t require refrigeration, and provides temporary colonization rather than permanent establishment in your gut.
Should I take S. boulardii with food?
S. boulardii can be taken with or without food. However, some people find taking it with food helps minimize any temporary digestive discomfort. Follow the specific instructions on your chosen product for optimal results.
