10 Best Saccharomyces Boulardii Capsules for Diarrhea (October 2026)

Dealing with diarrhea is exhausting. Whether it hits after a round of antibiotics, during international travel, or as part of a chronic IBS flare, the constant urgency and discomfort can disrupt your entire life. I have been there, and after months of research and personal testing, I found that Saccharomyces boulardii is one of the most effective probiotics for getting your gut back on track.

What makes S. boulardii different from regular probiotics is that it is a beneficial yeast, not a bacteria. That matters because it survives antibiotic treatment, stomach acid, and bile without being destroyed. It goes to work directly in your intestines, crowding out harmful pathogens, strengthening your gut barrier, and supporting your immune system. Clinical research spanning decades has shown it works for traveler’s diarrhea, antibiotic-associated diarrhea, and IBS-related symptoms.

Our team evaluated dozens of options and narrowed the field to the 10 best Saccharomyces boulardii capsules for diarrhea available right now. We looked at CFU counts, strain quality, third-party testing, capsule technology, and real user experiences. This guide covers everything you need to make an informed choice, from detailed product reviews to a buying guide that explains what actually matters when shopping for a yeast probiotic.

Top 3 Saccharomyces Boulardii Capsules for Diarrhea for October 2026

10 Best Saccharomyces Boulardii Capsules for Diarrhea (October 2026)

1. Florastor Probiotics – Most Clinically Studied S. Boulardii for Diarrhea

Florastor is the brand that introduced me to S. boulardii, and honestly, it set the bar for everything else. This is the number one selling probiotic worldwide in its class, and for good reason. The CNCM I-745 strain inside has over 65 years of clinical research behind it, which is far more than any other S. boulardii product can claim. When I took it during a course of antibiotics, the difference was noticeable within 48 hours.

Each capsule delivers 250mg of Saccharomyces boulardii with a suggested serving of 5 billion CFU. What I appreciate most is the simplicity. There are no extra fillers, no prebiotic blends, just a clean, well-studied yeast probiotic that does exactly what it promises. It is shelf-stable for three years, so you do not need to worry about refrigeration, even in warm climates.

With over 16,000 reviews and a 4.7-star rating, the user feedback speaks for itself. People consistently report life-changing relief from IBS symptoms, post-antibiotic gut restoration, and general digestive comfort. One reviewer mentioned taking Florastor through two separate antibiotic courses with zero digestive upset, which mirrors my own experience.

The main downside is the price. Florastor sits at a premium compared to other options on this list, and the glass bottle, while signaling quality, can occasionally arrive broken. If budget is not your primary concern and you want the most researched S. boulardii strain available, Florastor is the one to beat.

Who Should Choose Florastor

Florastor is ideal if you want a probiotic with the deepest clinical backing. If your doctor recommended S. boulardii by name, this is likely the brand they had in mind. It works especially well for people recovering from antibiotics or managing chronic digestive conditions like IBS.

It is also a strong choice for travel, since it does not need refrigeration and has a three-year shelf life. The vegetarian, gluten-free, and lactose-free formulation makes it accessible for most dietary needs.

Who Might Want to Look Elsewhere

If you are on a tight budget, Florastor’s premium pricing might feel steep when alternatives like WELMATE offer the same active ingredient at a fraction of the cost. Also, if you want a combined prebiotic-probiotic formula, Florastor does not include MOS or other prebiotic fibers.

2. THORNE Sacro-B – Professional-Grade S. Boulardii for Gut Health

Thorne is a brand I trust for almost any supplement category, and their Sacro-B does not disappoint. Healthcare practitioners routinely recommend Thorne products, and the third-party certification gives me confidence that what is on the label is actually in the bottle. For anyone dealing with occasional diarrhea or gut health restoration, Sacro-B delivers consistent results.

Each capsule contains 5 billion CFU of Saccharomyces boulardii. What sets this product apart is its focus on supporting secretory IgA production, which is a key component of your gut’s immune defense system. This is not just about stopping diarrhea. It is about building long-term resilience in your digestive tract.

Users on Amazon give it a 4.7-star rating across 455 reviews, with 84 percent rating it five stars. Reviewers frequently mention using it for post-antibiotic recovery and SIBO management. One user noted that after trying multiple probiotics, Thorne Sacro-B was the only one that actually resolved their persistent gut issues without side effects.

The downside is straightforward: you get 60 capsules at a higher price per capsule than most competitors. If you take two capsules daily as many users do, that is only a 30-day supply. But if quality and purity matter more to you than quantity, Thorne is worth every penny.

Who Should Choose Thorne Sacro-B

This is the pick for people who want pharmaceutical-grade quality and third-party verification. If your healthcare practitioner recommended S. boulardii, Thorne is a brand they likely stock in their own clinics. It is especially good for those with sensitive systems or multiple food intolerances.

The IgA support also makes it a strong choice for anyone looking to strengthen their gut immune barrier, not just address acute diarrhea symptoms.

Who Might Want to Look Elsewhere

If you need a long-term daily supplement at a lower cost, the 60-capsule bottle from Thorne may not be the most economical choice. Products like NOW Foods or WELMATE offer more capsules per dollar. Also, if you specifically want a prebiotic included, look at Jarrow Formulas or Nutricost instead.

3. Triquetra Health Organic S. Boulardii – First Organic S. Boulardii Probiotic

Triquetra Health made waves by creating the first USDA-certified organic Saccharomyces boulardii supplement on the market. For anyone who cares about clean sourcing and organic certification, this is a genuinely unique product. I was surprised that no one had done this before, and the execution is impressive.

Each serving delivers 10 billion CFU using the clinically validated CNCM I-1079 strain. That is double the CFU count of many competitors. The formula is vegan, GMO-free, and produced in a cGMP-certified facility. There are no fillers, no artificial ingredients, and the glass bottle packaging keeps the capsules protected from moisture and light.

With a 4.7-star rating from 233 reviews, the feedback is overwhelmingly positive despite this being a relatively new product. Users report fast-acting results, particularly for antibiotic-related gut issues. One reviewer shared that their digestive discomfort cleared up within three days of starting this supplement.

The main thing to be aware of is that since S. boulardii is a yeast, those managing Candida overgrowth should consult their healthcare provider before using it. Also, as a newer product, the review history is shorter than established brands like Florastor or Jarrow.

Who Should Choose Triquetra Health

This is the clear choice for anyone who prioritizes organic certification and clean ingredients. If you avoid GMOs, artificial additives, and want a sustainably sourced probiotic, Triquetra Health delivers. The 10 billion CFU dose also makes it one of the more potent options available.

It is an excellent fit for people with strict dietary requirements who still want a high-potency S. boulardii supplement for diarrhea relief.

Who Might Want to Look Elsewhere

If you have a known yeast sensitivity or are managing Candida overgrowth, the yeast-based nature of S. boulardii means you should talk to your doctor first. Also, if you want a product with thousands of reviews for confidence, established brands like Florastor or Jarrow have more track record.

4. Jarrow Formulas S. Boulardii + MOS – Amazon’s Choice for a Reason

Jarrow Formulas holds the Amazon’s Choice badge for S. boulardii supplements, and after using it myself, I understand why. The combination of a solid 5 billion CFU dose with MOS (mannan-oligosaccharides) prebiotic gives you a two-in-one approach. The probiotic yeast fights pathogens while the prebiotic feeds beneficial bacteria in your gut.

The delayed-release capsules are a meaningful upgrade over standard capsules. They are designed to survive stomach acid and dissolve in your intestines where S. boulardii does its best work. With 90 capsules per bottle, you get a generous supply that lasts 90 days at one capsule daily or 45 days at two.

Reading through the 5,365 reviews, the pattern is clear. Users consistently report life-changing results for IBS, C. difficile recovery, and chronic digestive issues. One user wrote that after years of gut problems following antibiotic treatment, Jarrow’s formula was the only thing that brought lasting relief within two weeks.

The only real complaints are about capsule size, which some users find difficult to swallow. There is also a single analysis suggesting MOS might interfere with good bacteria adhering to intestinal walls, though this is not widely supported by other research.

Who Should Choose Jarrow Formulas

Jarrow is perfect if you want the best balance of price, quality, and proven results. The Amazon’s Choice badge, combined with over 5,000 reviews and a 4.6-star rating, gives you confidence that this product delivers for the majority of users.

The MOS prebiotic addition makes it a better pick than Florastor if you want both a probiotic and a prebiotic in a single capsule. It is also one of the best values per capsule among premium brands.

Who Might Want to Look Elsewhere

If you have trouble swallowing large capsules, Jarrow’s pills might be uncomfortable. In that case, Florastor’s slightly smaller capsules might work better. Also, if you want a higher CFU dose above 5 billion, consider Pure Therapo Rx or Triquetra Health which both offer 10 billion CFU.

5. Pure Therapo Rx S. Boulardii – Pharma Grade With No Fillers

Pure Therapo Rx takes a no-compromises approach to S. boulardii supplementation. The formula contains absolutely no fillers, no excipients, no flow agents, and no magnesium stearate. What you get is 250mg of pure Saccharomyces boulardii with 10 billion CFU per capsule using the patented Lynside CNCM I-3799 strain.

I appreciate that this strain is specifically stable at body temperature (98.6 degrees Fahrenheit), which means it survives the journey through your stomach acid intact. The product is also shelf-stable for 24 months at room temperature, so you can keep it in your medicine cabinet without worry.

With 4,032 reviews and a 4.6-star rating, Pure Therapo Rx has built a loyal following. Users frequently mention its effectiveness during travel and after antibiotic treatments. One reviewer noted that they switched from Florastor to this brand and saw equivalent results at a lower cost per capsule.

The 120-capsule bottle provides a solid four-month supply at one capsule daily. For anyone who wants a clean, high-potency formula without any extras, Pure Therapo Rx delivers exactly that.

Who Should Choose Pure Therapo Rx

This is the right pick if you are particular about what goes into your supplements. The no-fillers formula and pharma-grade manufacturing appeal to people who want the cleanest possible product. It is also great for travelers since it is shelf-stable and effective for diet-related digestive changes.

The 10 billion CFU dose makes it suitable for more intense digestive situations, not just mild maintenance.

Who Might Want to Look Elsewhere

If you want a prebiotic included with your S. boulardii, Pure Therapo Rx is a standalone product without MOS or other prebiotics. Jarrow Formulas or Nutricost would be better options in that case. Also, if you prefer a brand with the CNCM I-745 strain specifically, Florastor or Thorne use that particular strain.

6. NOW Foods S. Boulardii – Trusted Brand With Wide Certifications

NOW Foods has been a staple in the supplement industry for decades, and their S. boulardii product reflects that experience. What stands out immediately is the sheer number of dietary certifications: soy-free, non-GMO, vegan, vegetarian, nut-free, gluten-free, dairy-free, egg-free, keto-friendly, kosher, and halal. I have not seen another S. boulardii product with this many certifications.

Each capsule delivers 5 billion CFU of Saccharomyces boulardii. The NPA A-rated GMP certification means every aspect of the manufacturing process has been examined, from lab testing to stability. As a yeast-based probiotic, it naturally survives stomach acid better than many bacterial strains, which is part of why S. boulardii is so effective.

The user feedback across 4,290 reviews consistently highlights effectiveness after antibiotics and gentle stomach tolerance. One user mentioned that they switched from a more expensive brand and found NOW Foods just as effective for their IBS symptoms. Another praised it as their go-to travel supplement.

The main limitation is the 5 billion CFU count, which is lower than some 10 billion CFU options. Stock can also be tight, with only limited units available at times. But for the price and quality, NOW Foods remains one of the best Saccharomyces boulardii capsules for diarrhea on the market.

Who Should Choose NOW Foods S. Boulardii

If you have multiple dietary restrictions or follow specific dietary laws, NOW Foods covers more bases than any competitor. The kosher and halal certifications are rare in this category. It is also an excellent value choice for anyone wanting 120 capsules from a trusted brand.

First-time S. boulardii users will find this to be a gentle, effective introduction to yeast probiotics.

Who Might Want to Look Elsewhere

If you want a higher CFU potency, this 5 billion CFU option may feel underpowered compared to 10 billion CFU products like Pure Therapo Rx or WELMATE. Also, if you need guaranteed stock availability, the occasional supply issues with this product could be frustrating.

7. Klaire Labs SFI Health S. Boulardii – Practitioner-Trusted Probiotic

Klaire Labs, now under the SFI Health umbrella, makes professional-grade supplements that practitioners recommend by name. Their S. boulardii is specifically marketed for diarrhea relief, and the clinical focus shows. What makes this product particularly valuable is that S. boulardii is naturally resistant to antibiotics, meaning you can take it during antibiotic treatment without the probiotic being killed off.

Each capsule provides 5 billion CFU, and the formulation supports normal bowel movements, balanced microbiome function, and a healthy inflammatory response. It also supports intestinal immune activity, which is a nice bonus beyond just diarrhea management.

Across 876 reviews with a 4.6-star rating, the feedback highlights something interesting: many users report benefits beyond digestion. People mention improvements in skin issues like hives and mold sensitivity, and some with histamine intolerance found relief. This aligns with research showing S. boulardii supports broader immune function.

The main drawback is that 60 capsules at this price point gives you less value per capsule than competitors like WELMATE or NOW Foods. But for the professional-grade quality and practitioner endorsement, many users find it worth the premium.

Who Should Choose Klaire Labs

If your healthcare practitioner recommended S. boulardii, Klaire Labs is one of the brands they are most likely to trust. It is especially valuable for anyone currently on antibiotics who needs a probiotic that will not be destroyed by the medication.

People dealing with histamine intolerance or skin-related immune issues may also benefit from this particular formulation.

Who Might Want to Look Elsewhere

At 60 capsules per bottle, the value is lower than competitors offering 100 to 200 capsules. If you need a long-term daily supplement, WELMATE’s 200-capsule bottle offers much better economics. If you want a prebiotic included, Jarrow Formulas adds MOS to the mix.

8. WELMATE S. Boulardii – Best Budget Pick With 200 Capsules

WELMATE is the budget champion in this lineup. For roughly the same price as 60 to 90 capsules from premium brands, you get 200 capsules with 10 billion CFU each. The active ingredient is identical to Florastor: Saccharomyces boulardii at 500mg per serving. If you are looking for the best bang for your buck, this is it.

The formula is clean and straightforward: vegan, dairy-free, organic, gluten-free, and non-GMO. Each bottle provides a 100-day supply at two capsules daily, which is the typical therapeutic dose for diarrhea relief. It is shelf-stable, so no refrigeration needed, and works well for IBS, diarrhea, and general bloating.

With 597 reviews and a 4.6-star rating, the user feedback is solid. Reviewers frequently compare WELMATE favorably against Florastor, noting similar effectiveness at a much lower cost. One user mentioned switching from a name brand after their doctor confirmed the active ingredient was the same.

The trade-offs are minor but worth noting. WELMATE has a lower best-seller ranking, and some users report slower delivery times since it may not always ship via Prime. But for the savings alone, especially for long-term daily use, WELMATE is hard to beat.

Who Should Choose WELMATE

If you need an affordable, long-term S. boulardii supplement, WELMATE gives you the most capsules per dollar of any product on this list. It is ideal for people managing chronic digestive issues who need daily support without breaking the bank.

It is also a smart choice if your doctor recommended Florastor but you want a more affordable alternative with the same active ingredient.

Who Might Want to Look Elsewhere

If brand reputation and clinical pedigree matter to you, Florastor and Thorne carry more weight with healthcare providers. WELMATE also does not include a prebiotic, so if you want that combined approach, look at Jarrow Formulas or Nutricost instead.

9. Nutricost S. Boulardii + MOS – Prebiotic-Probiotic Combo

Nutricost combines S. boulardii with MOS (mannan-oligosaccharides) in a single capsule, giving you both a probiotic and a prebiotic working together. The theory is sound: MOS feeds beneficial gut bacteria while S. boulardii directly combats pathogens. I like this dual approach for people who want comprehensive gut support without taking multiple separate supplements.

Each serving delivers over 5 billion CFU plus 200mg of MOS. The dietary certifications are among the most comprehensive: vegan, gluten-free, dairy-free, soy-free, nut-free, keto-friendly, kosher, and halal. It is also NSF Certified and made in a GMP-compliant, FDA-registered facility.

Who Should Choose Nutricost

If you want the convenience of a prebiotic and probiotic in a single capsule, Nutricost delivers that synergy at an affordable price. It is a good option for daily gut maintenance and mild digestive support rather than acute diarrhea episodes.

The extensive dietary certifications make it accessible for nearly anyone, regardless of food sensitivities or religious dietary requirements.

Who Might Want to Look Elsewhere

If you are dealing with severe or acute diarrhea, the 5 billion CFU dose might not be strong enough compared to 10 billion CFU products like Triquetra Health or WELMATE. Also, if fast shipping matters, the lack of Prime eligibility could be an issue.

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10. Vitamatic S. Boulardii – Most Affordable With DRcaps Technology

BUDGET PICK

Vitamatic Saccharomyces Boulardii Probiotic 10B per Serving + Yeast Extract (MOS Yeast Fraction) 300 mg – 60 DR Capsules – Made in the USA

★★★★★★★★★★4.4 / 5

10B CFU

MOS 300mg

60 DR Caps

Made in USA

Check Price

Pros

• Most affordable option
• DRcaps protect from stomach acid
• Includes MOS prebiotic
• Made in USA GMP facility

Cons

• Some reports of constipation and bloating
• Lower 4.4-star rating
• Unusual smell reported

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Vitamatic rounds out our list as the most affordable option, and it still brings some impressive features to the table. The standout is the DRcaps (delayed-release) capsule technology, which is specifically designed to protect the ingredients from stomach acid and deliver them intact to your intestines. For a product at this price point, that is a welcome feature.

Each serving delivers 10 billion CFU plus 300mg of MOS yeast fraction as a prebiotic. That is the highest MOS dose on this list. The formula is non-GMO, gluten-free, and made in a GMP-compliant, FDA-registered facility in the USA. You also get 60 delayed-release capsules per bottle.

With 98 reviews and a 4.4-star rating, the feedback is more mixed than other products on this list. Many users praise its effectiveness for rebuilding gut biome after antibiotics, and the delayed-release capsules get consistent positive mentions. However, some users report severe constipation and bloating, and one reviewer noted an unusual smell.

At its price, Vitamatic is worth trying if you want a budget-friendly entry into S. boulardii supplementation. Just be aware that individual responses vary more with this product than with the higher-rated options.

Who Should Choose Vitamatic

If budget is your primary concern and you still want a product with 10 billion CFU and MOS prebiotic, Vitamatic is the most affordable option available. The DRcaps technology also gives you better delivery than standard capsules at this price range.

It is a reasonable choice for short-term use during antibiotic treatment or travel when you need something effective without a big investment.

Who Might Want to Look Elsewhere

The 4.4-star rating and reports of constipation and bloating suggest that results are less consistent than with higher-rated products. If you have a sensitive digestive system or want more predictable results, spending a bit more on Jarrow Formulas or NOW Foods would be a safer bet.

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Buying Guide: How to Choose the Best Saccharomyces Boulardii Capsules for Diarrhea

Choosing the right S. boulardii supplement comes down to understanding a few key factors. I have spent months comparing products, reading clinical literature, and testing different brands. Here is what actually matters when making your decision.

CFU Count: More Is Not Always Better

Most S. boulardii supplements range from 5 billion to 10 billion CFU per serving. Clinical studies generally use doses between 5 billion and 10 billion CFU for diarrhea treatment. For mild or preventive use, 5 billion CFU is sufficient. For acute diarrhea or post-antibiotic recovery, 10 billion CFU may work faster.

Do not assume that more CFU automatically means better results. The strain quality and delivery method matter just as much as the total count.

Strain Identification Matters

Not all S. boulardii is the same. The most studied strains include CNCM I-745 (used by Florastor and Thorne), CNCM I-3799 (used by Pure Therapo Rx), and CNCM I-1079 (used by Triquetra Health). Each strain has different clinical backing. The CNCM I-745 strain has the most research behind it, with over 65 years of published studies, making it the gold standard for clinical confidence.

Delayed-Release Capsules vs Standard Capsules

S. boulardii is naturally resistant to stomach acid since it is a yeast, not a bacteria. However, delayed-release capsules like those used by Jarrow Formulas and Vitamatic add an extra layer of protection. If you have a sensitive stomach or take other medications that affect stomach pH, delayed-release technology can help ensure more of the probiotic reaches your intestines intact.

Prebiotic Inclusion: MOS and Why It Helps

Several products on this list include MOS (mannan-oligosaccharides), a prebiotic that feeds beneficial gut bacteria. Products like Jarrow Formulas, Nutricost, and Vitamatic combine S. boulardii with MOS for a synergistic effect. The probiotic fights harmful organisms while the prebiotic nourishes your existing good bacteria. For comprehensive gut support, this combination can be more effective than a standalone probiotic.

Storage and Shelf Life

One of the biggest advantages of S. boulardii over bacterial probiotics is that it is shelf-stable. None of the products on this list require refrigeration. However, shelf life varies. Florastor boasts a three-year shelf life, while Pure Therapo Rx guarantees stability for 24 months. Always check expiration dates and store in a cool, dry place away from direct sunlight.

Third-Party Testing and Certifications

Forum users consistently report that third-party testing is one of their top trust signals when choosing a supplement. Thorne Sacro-B is third-party certified, NOW Foods holds NPA A-rated GMP certification, and Nutricost is NSF Certified. These independent verifications confirm that what is on the label matches what is in the bottle.

Who Should Avoid S. Boulardii

While S. boulardii is safe for most people, there are important exceptions. Immunocompromised individuals, particularly those with central venous catheters, should avoid S. boulardii due to a rare risk of fungemia. People with severe yeast allergies should also exercise caution. If you are managing Candida overgrowth, consult your healthcare provider before starting any yeast-based supplement.

What to Expect in the First Week

Forum discussions reveal something many articles skip: some users experience temporary worsening of symptoms before improvement. This is sometimes called a die-off reaction, where the probiotic yeast begins displacing harmful organisms. Gas, bloating, and changes in bowel frequency are common during the first three to five days. Most users report significant improvement by day seven.

Frequently Asked Questions About Saccharomyces Boulardii for Diarrhea

How much Saccharomyces boulardii should I take for diarrhea?

For adults, the typical dosage is 250 to 500mg (5 to 10 billion CFU) taken one to two times daily. For acute diarrhea, most clinical studies use 500mg twice daily (10 billion CFU total). For traveler’s diarrhea prevention, 250mg daily is usually sufficient. Always follow the specific product instructions and consult your doctor if symptoms persist beyond a few days.

Is Saccharomyces boulardii a probiotic for diarrhea?

Yes. Saccharomyces boulardii is a probiotic yeast specifically studied for treating and preventing diarrhea. Unlike bacterial probiotics, it survives antibiotic treatment and stomach acid, making it particularly effective for antibiotic-associated diarrhea, traveler’s diarrhea, and IBS-related diarrhea. It works by strengthening the gut barrier, fighting pathogens, and supporting immune function.

How long does it take for Saccharomyces boulardii to work?

Most people notice improvement within 2 to 5 days of consistent use. For acute diarrhea, some users report relief within 24 to 48 hours. For chronic conditions like IBS, it may take 1 to 2 weeks of daily use to see meaningful improvement. Full benefits typically develop after 2 to 4 weeks of consistent supplementation.

Can Saccharomyces boulardii cause loose stools?

Yes, initially some people experience temporary loose stools or increased bowel frequency during the first few days. This is usually a sign that the probiotic is working to rebalance your gut flora. If loose stools persist beyond the first week or become severe, stop use and consult your healthcare provider. A small percentage of users in reviews reported constipation instead.

What is the best probiotic for severe diarrhea?

Saccharomyces boulardii is one of the most clinically supported probiotics for severe diarrhea, particularly the CNCM I-745 strain found in Florastor and Thorne Sacro-B. For antibiotic-associated diarrhea, S. boulardii is often recommended because it survives antibiotic treatment. Lactobacillus rhamnosus GG is another well-studied option. For severe or persistent diarrhea, always consult your doctor to rule out serious underlying conditions.

Final Thoughts on the Best Saccharomyces Boulardii Capsules for Diarrhea

Saccharomyces boulardii has earned its reputation as one of the most effective probiotics for diarrhea relief. Whether you are dealing with traveler’s diarrhea, recovering from antibiotics, or managing a chronic condition like IBS, the right S. boulardii supplement can make a real difference in how quickly your gut recovers.

For most people, I recommend starting with Florastor for its unmatched clinical pedigree, Jarrow Formulas for the best overall value with its prebiotic-probiotic combo, or Triquetra Health if organic certification is important to you. If budget is the priority, WELMATE delivers the same active ingredient at a fraction of the cost with 200 capsules per bottle.

Whichever product you choose, give it at least a week to work. The first few days might include some adjustment symptoms, but for the vast majority of users, consistent S. boulardii supplementation brings meaningful, lasting relief from diarrhea and digestive discomfort.