Jarrow Formulas Saccharomyces Boulardii Review – 5 Billion CFU

Quick Verdict

If you're researching Saccharomyces Boulardii probiotics, you probably already know this strain is different from the garden-variety Lactobacillus blends sitting next to it on the shelf. Jarrow Formulas delivers 5 billion CFU of that probiotic yeast in a delayed-release capsule with MOS prebiotic backing — a combination that is harder to find than it should be. It's a strong option for gut recovery, travel support, and anyone finishing a course of antibiotics. My rating: 4.4 out of 5.

What Is the Jarrow Formulas Saccharomyces Boulardii Supplement?

Most probiotic supplements on Amazon contain bacterial strains — Lactobacillus, Bifidobacterium, that whole family. Saccharomyces Boulardii is different. It's a probiotic yeast, originally isolated from lychee and mangosteen fruit, and it behaves differently inside your gut than bacterial probiotics do. The Jarrow Formulas version pairs 5 billion CFU (colony-forming units) of S. boulardii with MOS, a prebiotic that feeds the good bacteria already living in your intestines. The result is a supplement that doesn't just add beneficial microbes — it tries to support the whole gut ecosystem.

The supplement comes in 90 delayed-release veggie capsules, which Jarrow says is good for a 90-day supply at one capsule per day. That dosing is straightforward, though if you're targeting a specific issue (post-antibiotic recovery, for example), two capsules per day is common — something worth discussing with your healthcare provider.

Key Features

• Minimum 5 billion CFU of Saccharomyces Boulardii per serving at time of manufacture
• Includes MOS (mannan oligosaccharides) — a prebiotic that feeds beneficial gut bacteria
• Delayed-release capsule helps protect the yeast from stomach acid
• Non-GMO, vegan formula free from wheat, dairy, soy, egg, fish, peanuts, tree nuts, and sesame
• 90 capsules per bottle — 90-day supply at standard one-per-day dosing
• Room-temperature stable — no refrigeration required

Hands-On Review

I picked up a bottle of Jarrow Formulas Saccharomyces Boulardii because I'd just finished a round of broad-spectrum antibiotics — a scenario where this specific strain has the most evidence behind it. The bottle is small and unremarkable, which I actually appreciate. No oversized box, no unnecessary plastic waste. The capsules themselves are small, smooth, and easy to swallow with water.

One thing I noticed immediately: the label clearly states the product is vegetarian and vegan. That's not always a given with delayed-release capsules (some use gelatin), and it matters if you're careful about your supplement sourcing.

Taking one capsule per day with water — sometimes with food, sometimes not — produced no digestive discomfort, which is exactly what you want from a probiotic. The delayed-release design is worth noting: it means the capsule survives the stomach's acidic environment and releases the S. boulardii further down the digestive tract, where it's more likely to remain viable.

By day three I had no dramatic revelations, and I'd encourage you to be skeptical of any probiotic review that claims life-changing results within 48 hours. What I did notice by the end of the first week was more consistent stool consistency and less of the residual bloating that typically lingers after a course of antibiotics. By week two, that feeling had settled into something I could call normal.

What surprised me was the MOS inclusion. Most standalone S. boulardii products are exactly that — just the yeast. Adding a prebiotic to feed the existing bacterial gut flora is a more holistic approach, and it reflects the kind of formulation thinking that Jarrow Formulas is known for among people who follow the supplement space closely. It won't transform your microbiome in two weeks, but it's a more considered supplement than a single-strain product thrown into a capsule.

Who Should Buy It?

Jarrow Formulas Saccharomyces Boulardii is a good fit in several specific situations:

• Post-antibiotic recovery: S. boulardii has some of the stronger evidence for helping restore gut flora after antibiotic disruption. The yeast survives antibiotics that would wipe out bacterial probiotics, and it appears to help repopulate the intestinal environment.
• Frequent travelers: Multiple studies suggest S. boulardii reduces the risk of traveler's diarrhea. It's heat-stable (no refrigeration needed), which makes it practical for carry-on bags and international trips.
• People with IBS or recurring gut discomfort: While not a cure, S. boulardii can help rebalance gut flora that may contribute to bloating, irregularity, and cramping. The MOS adds prebiotic support for a broader approach.
• Anyone wanting a vegan, allergen-friendly probiotic: Free from the nine major allergens and suitable for vegans — a surprisingly rare combination in the probiotic space.
• Health-conscious adults building a gut maintenance routine: One capsule per day, 90 in a bottle, no refrigeration. That's a low-friction daily habit.

Skip this if you have a known yeast allergy or sensitivity to Saccharomyces species — this product is exactly what you'd want to avoid in that case. If you're expecting overnight results for a chronic issue, manage your expectations: probiotic effects accumulate over weeks, not days. And if you're after a broad-spectrum bacterial blend for general wellness with no specific gut concern in mind, there are cheaper daily probiotics that would do the job.

Alternatives Worth Considering

If this Jarrow Formulas product doesn't feel like the right fit, here are two alternatives worth researching:

• Seed DS-01 Daily Synbiotic: A high-CFU bacterial probiotic with a much broader strain profile. Best for people who want a general gut health multi-strain formula rather than targeted S. boulardii support. Pricier, but more comprehensive for everyday wellness.
• NOW Foods Clinical Probiotic: Offers multiple bacterial strains in a single product with a higher total CFU count. Better suited to people who want a high-potency bacterial blend and don't have a specific need for probiotic yeast.
• Doctor's Best Saccharomyces Boulardii: A direct S. boulardii alternative with a similar 5 billion CFU dose but without the MOS prebiotic inclusion. Worth comparing if the prebiotic component isn't a priority for you.

FAQ

Final Verdict

Jarrow Formulas Saccharomyces Boulardii + MOS is a well-formulated probiotic supplement that stands apart from most bacterial probiotics on the market. The inclusion of MOS prebiotic support, the delayed-release delivery, and the clean allergen-free formula make it a thoughtful choice rather than a commodity product. At 5 billion CFU it's not the highest-potency option available, but S. boulardii doesn't need 50 billion to do its job — the research backing this strain is specifically about its unique properties as a probiotic yeast, not raw CFU volume. Whether you're recovering from antibiotics, traveling frequently, or managing a gut that feels perpetually off, this is a supplement worth trying. The 90-capsule bottle gives you a full 90-day window to evaluate whether it's working for you.