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Optibac Jarrow Formulas Saccharomyces Boulardii + MOS, 5 Billion CFU bottle
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Optibac Jarrow Formulas Saccharomyces Boulardii + MOS, 5 Billion CFU Review

A probiotic supplement combining the beneficial yeast Saccharomyces boulardii with prebiotics (MOS) to support the intestinal tract, a healthy gut flora balance, and immune function.

Product Focus: Colon Pouch ComfortAlso covers:Digestion
Tier ⓘ
Members
Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
Members
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
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Biohacker Mentions
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Cost per month
$8
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Study, Trial or Testing Result SummaryMembersHuman studies

We found human studies on colon pouch support or comfort for either ingredient in this product, so there is study evidence to summarize for this goal. Each daily serving provides Saccharomyces boulardii, a probiotic yeast, at 500 milligrams, which the label lists as 5 billion live cultures per capsule, along with 400 milligrams of a yeast fraction rich in mannan oligosaccharides, a type of fiber. …

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Review Totals and SummaryMembers26,225 reviews
26,225 reviews · IHerb 26,013 · Swanson 78 · Walmart 76 · Pureformulas 52 · Sprouts 6

Jarrow Formulas Saccharomyces Boulardii + MOS, 5 Billion CFU draws an response from users, of whom highlight its consistent quality and noticeable on their digestive . Across platforms like iHerb, Swanson, Walmart, and Pureformulas, reviewers repeatedly mention that taking this probiotic has manage digestive discomfort, particularly after meds or during periods of stomach upset. …

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Biohacker SummaryMembersWhat our biohacker panel says

Four of the five panelists who spoke about the main ingredient, Saccharomyces boulardii, it or use it, and the fifth, whose latest position is , called it a fungus and had used it earlier. The common reason is to deal with yeast overgrowth, since they describe it as a yeast that against candida, and one says it breaks down the barrier candida builds. …

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RAL SummaryMembersThe tier and why

This is placed in the reviews tier because 95 percent of its than 26,000 ratings are , while there are human studies on colon pouch support for Saccharomyces boulardii or mannan oligosaccharides.

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More DetailsMembersBody systems · Combine with · Possible side effects

Body systems: Digestive system. Combine with and possible side are for members.

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Supplement FactsSaccharomyces boulardii 250 mg · MOS Yeast Fraction 200 mg
Supplement Facts
Serving Size 1 Delayed-Release Veggie Capsule
Servings Per Container 90
Amount Per Serving% Daily Value
Saccharomyces boulardii (an S. cerevisiae Strain) (5 Billion CFU†)250 mg†
MOS Yeast Fraction (Min. 35% Manno-oligosaccharides [MOS]) (S. cerevisiae)200 mg†
† Daily Value not established.

Directions: Take 1 capsule, 1 or 2 times per day with water or juice.

Barcode (UPC) 790011030041 · Label source: Pureformulas · Report a label change

Graded October 23, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.