NOW Foods Saccharomyces Boulardii Probiotic Review – 5 Billion CFU Worth It?

Quick Verdict

If you are looking for a well-priced, scientifically backed yeast probiotic, NOW Foods Saccharomyces Boulardii delivers 5 billion CFU in every capsule with a seriously impressive certification list. It suits gut-health seekers, travellers and anyone finishing a course of antibiotics. My score: 4.3 out of 5 — it earns its place on the shelf, though refrigeration for peak potency is a minor inconvenience.

What Is the NOW Foods Saccharomyces Boulardii?

Saccharomyces Boulardii — often shortened to S. boulardii — is a probiotic yeast strain first isolated from lychee and mangosteen fruit. Unlike the bacterial probiotics you see most often in supplements (Lactobacillus, Bifidobacterium), it is, technically, a yeast. That single biological difference gives it some distinct advantages: it survives stomach acid, tolerates temperatures up to around 37 °C, and crucially, antibiotics do not kill it. That last point is why so many gut-health practitioners recommend it alongside or after antibiotic courses.

NOW Foods packages this strain at 5 billion CFU (colony-forming units) per capsule — a dose aligned with the amounts used in most clinical research on S. boulardii for occasional diarrhoea and gut-flora balance. Each bottle contains 120 vegetable capsules, which at one capsule daily works out to roughly four months of supply. The capsules are small enough (though not tiny — see below) and have virtually no taste or smell, which makes daily dosing easy.

Key Features

• 5 billion CFU of Saccharomyces Boulardii per capsule at time of manufacture
• 120 vegetable capsules per bottle — a 4-month supply at standard dose
• Certified vegan, vegetarian, gluten-free, dairy-free, soy-free, nut-free, egg-free
• Non-GMO verified and Kosher/Halal certified
• NPA A-rated GMP manufacturing certification
• Packaged in the USA by a family-owned company established in 1968
• Resistant to antibiotics — safe to take alongside most antibiotic courses

Hands-On Review

I unboxed this on a Tuesday morning with a cup of black coffee — no ritual, just a gut that had been a bit off after a course of amoxicillin two weeks earlier. First impression: the bottle is compact and the label is clean, listing exactly what you need without marketing fluff. The capsules are a creamy off-white and run slightly larger than a standard fish-oil gel. Nothing alarming, but worth noting if you regularly struggle with pill size.

Day three on one capsule daily with breakfast, and I'll be honest — I was skeptical about feeling anything from a yeast probiotic I had never tried before. By day five, though, my bowel movements had settled into a more predictable pattern. Not a dramatic transformation, but a noticeable difference from the irregular mess the antibiotics had left behind. What surprised me was the lack of any digestive noise — no bloating, no gas, no rumbling. That steadiness matters when you are trying to rebuild.

A friend of mine borrowed six capsules before a work trip to Lisbon. She is the kind of traveller whose gut protests every new cuisine within 24 hours. She texted me on day three: "actually fine, no issues at all." She took two capsules daily starting five days before departure. That is a small sample size, but it mirrors what the research says about S. boulardii and travel-associated loose stools, and it tracks with my own experience.

One thing nobody mentions in the listings: the product recommends refrigeration. Fine in normal life, but if you travel often like I do, finding a mini fridge in a hotel is not guaranteed. S. boulardii is more heat-tolerant than bacterial strains, so a few days at room temperature is not a crisis — but long-term potency may take a hit. I ended up keeping a spare bottle at room temperature for trips and the main bottle in the fridge at home.

Who Should Buy It?

• Post-antibiotic recovery seekers — S. boulardii repopulates the gut without getting wiped out by remaining antibiotics, making it a smart follow-up after any bacterial infection treatment.
• Frequent travellers — Anyone heading to countries with different food and water exposures will benefit from the support S. boulardii offers against occasional travel diarrhoea.
• IBS and bloating sufferers — While not a cure, maintaining a more stable gut flora with a daily yeast probiotic can reduce the frequency and intensity of bloating episodes over time.
• Vegans and people with multiple food sensitivities — The certification breadth (gluten, dairy, soy, nut, egg free) makes this one of the few probiotics on Amazon that genuinely leaves most allergens out.

Skip this if you are strictly looking for a bacterial probiotic blend with multiple strains, prebiotic fibre and digestive enzymes built in. This is a single-strain yeast supplement — a powerful one, but a focused one. If you want a kitchen-sink formula, look at brands like Seed or Ritual.

Alternatives Worth Considering

• Jarrow Formulas Saccharomyces Boulardii — Also delivers 5 billion CFU per capsule with a slightly smaller 90-capsule bottle. Comparable price per dose; Jarrow is another trusted supplement brand in the gut-health space.
• Life Extension Saccharomyces Boulardii — Offers a higher 10 billion CFU dose per capsule in a 90-count bottle. A better option if you want a stronger single-capsule dose, though it costs more per month.
• Seed Daily Synbiotic — A bacterial + yeast combo (including S. boulardii) in a prebiotic DS-01 capsule. Worth considering if you want broad-spectrum support rather than a high-dose S. boulardii focus.

FAQ

Final Verdict

NOW Foods Saccharomyces Boulardii is exactly what it promises: a reliable, well-manufactured, great-value yeast probiotic at a clinically relevant dose. The 120-capsule bottle means you are not reordering every few weeks, and the exhaustive allergen-free certifications make it accessible to almost everyone. I will keep using it — my gut feels steadier, my post-antibiotic recovery accelerated noticeably, and the travel anecdote from my Lisbon friend is hard to argue with. The only real caveat is refrigeration for long-term potency, and that is a minor logistical note rather than a flaw. If you want to try S. boulardii, this is a sensible, affordable place to start.