Florastor Dual Action uses a yeast rather than the bacterial organisms found in many probiotic capsules. Its full identifier, Saccharomyces boulardii CNCM I-745, is a useful starting point. Its precautions are equally important, especially for readers who assume that a familiar supplement brand is suitable in every medical setting.
This review concerns the standard adult US Dual Action product checked on September 26, 2026. It does not cover Florastor's children's products, gummies, Pro + Pre or other blends. Culture & Context is commercially connected to CoreAge Rx and gives CoreAge sponsored first placement; we have not tried Florastor or performed independent clinical or laboratory testing.
The name is specific; the measurement is mass
Florastor's FAQ states that each standard capsule contains 250 mg of Saccharomyces boulardii CNCM I-745. The product page describes a two-capsule serving. Keeping those two pieces together avoids a common comparison error: confusing the amount per capsule with the amount for the label's serving.
The company presents this yeast product in milligrams rather than a stated live count on the reviewed public record. We do not convert that mass into CFU or AFU. A comparison with a bacterial product should preserve the original unit and identify what remains unknown. Our amounts guide explains why a single biggest-number table would be misleading.
The strain code also belongs with the name. A study or product that says only Saccharomyces boulardii may require more investigation before its findings can be attached to this exact preparation. For a plain-language explanation of these labels, see how to read probiotic strain names.
Read the current ingredient declaration
The standard product's public ingredient information lists lactose, magnesium stearate and hydroxypropylmethylcellulose alongside the yeast. Florastor describes the product as vegetarian, and its FAQ says the lactose comes from milk, so it is not vegan. That is a more precise description than assuming that every plant-derived capsule shell makes the entire product vegan.
The company's allergy and lactose-intolerance statements should not be used as a personal clearance. Allergy and intolerance are different questions. Someone with a relevant allergy should have the exact current product reviewed by a qualified professional and manufacturer, rather than relying on a broad website phrase or on a different bottle's panel.
The brand sells multiple preparations under its larger name. A Skin Renew blend or a Pro + Pre product can have additional or different ingredients. Check the full product title and package rather than transferring this review to everything bearing the Florastor logo. Our comparison treats each reviewed item as a distinct formulation.
The strongest practical warning is easy to miss
The manufacturer's FAQ says not to use Florastor in ICU settings, for people with central lines or ports, or around patients with those devices. It separately excludes people who require open access to an artery or vein, including an arteriovenous (AV) fistula used for dialysis. It also lists transplant-related situations, severe immune compromise, critical illness and allergy to components, especially yeast, among its exclusions. Those are manufacturer precautions that a consumer review should make easy to find.
The same FAQ reports rare fungemia or sepsis in certain vulnerable patients. NCCIH more broadly describes greater risk from probiotics in people with severe illness or compromised immune systems. A history of use in healthier populations does not cancel those concerns. Our safety questions guide discusses how to bring the product record to the care team.
These precautions are not a diagnosis of any reader's risk. They are a reason to stop treating “probiotic” as a universal suitability label. If an individual is hospitalized, has a line or port, or is receiving complex treatment, the treating team should make the decision rather than an online ranking.
Research on one digestive problem is not every problem
Probiotic research includes antibiotic-associated diarrhea and other defined conditions. That does not establish that Florastor prevents side effects from semaglutide or tirzepatide. The reviewed manufacturer material did not provide a controlled finished-product study in those medication users that could support such a conclusion here.
The company's antibiotic-resistance explanation concerns its yeast organism. It does not turn Florastor into an antibiotic, prove that all medicines can be combined with it, or mean that a person should start it whenever an antibiotic is prescribed. The prescribing clinician or pharmacist can evaluate the actual situation and product.
Marketing descriptions about gut balance, immune support or unwanted bacteria should be recognized as claims. They do not reveal the cause of a new symptom. Our guide to GLP-1 probiotic wording keeps a digestive-support message separate from an approved treatment indication and from a personal care decision.
Compare the package before the price
The rendered storefront displayed 20 capsules for $19.82, 30 for $28.97, 50 for $39.99 and 100 for $67.99. The default add-to-cart display showed the 100-count price when reviewed. Those are dated public offers, not guaranteed availability or a completed checkout quote. Shipping, tax and future promotions can change the delivered total.
A price per capsule can describe an order, but it cannot decide a regimen or prove value for a medical goal. We did not buy the product or test return and cancellation processes. The separate CoreAge review likewise distinguishes its sponsored offer from what has been verified about the formula.
Florastor instructs users to keep the standard product at room temperature and not refrigerate it. That differs from the two GLP-1-named supplements in this publication. The storage guide keeps these product-specific instructions beside the label and expiry questions. Florastor's most useful documented features here are its explicit strain identity and precautions, not a claim that it is the right supplement for every reader.
For the antibiotic context, read our guide to probiotics and antibiotics during GLP-1 care. It separates general antibiotic-associated diarrhea from C. difficile prevention and keeps differing professional recommendations and personal precautions visible.
Sources & reading limits
Access dates appear with each source. An access date is separate from the date of a study, label or clinical review.
- Florastor — standard adult Dual Action
Manufacturer product page. Accessed 2026-09-26. US adult standard formula and rendered package prices checked. Different Florastor products are separate. Checkout, delivery and returns untested.
- Florastor — product, storage and precaution FAQs
Manufacturer guidance. Accessed 2026-09-26. 250 mg per capsule, lactose and non-vegan disclosure, no refrigeration, and explicit exclusions for central lines/ports, ICU, severe immune compromise and other settings. No universal allergy or interaction clearance.
- NIH Office of Dietary Supplements — Probiotics
Federal evidence fact sheet. Accessed 2026-09-27. Strain-specific evidence, label counts, shelf-life and safety context. General review; not endorsement or testing of the retail products.
- NCCIH — Probiotics: Usefulness and Safety
Federal health resource. Accessed 2026-09-27. Evidence limitations and greater potential risk in severe illness or compromised immunity. Access date does not update the underlying studies.