ISAPP (Int. Scientific Assoc. for Probiotics)
The scientific body that defines what actually counts as a probiotic — and what is just marketing
Definition
ISAPP (International Scientific Association for Probiotics and Prebiotics) is the leading global scientific body that sets the official definitions of probiotic, prebiotic, synbiotic, and postbiotic through expert-panel consensus statements. Its landmark 2014 statement (Hill et al.) reaffirmed the definition of a probiotic as "live microorganisms that, when administered in adequate amounts, confer a health benefit on the host." These criteria make it possible to distinguish a scientifically supported probiotic from a product that merely contains microorganisms without an identified strain or a proven effective dose.
Detailed explanation
ISAPP emerged to bring order to a market crowded with loose claims. Its 2014 consensus, published in Nature Reviews Gastroenterology & Hepatology, sets three requirements every legitimate probiotic must meet: it must be characterized at the strain level (for example *Lactobacillus rhamnosus* GG, not just "lactobacilli"), it must show a health benefit in controlled human studies, and it must be delivered at a viable, adequate dose (measured in CFU, colony-forming units) through the end of the product's shelf life.
Strain-level characterization is critical because probiotic effects are strain-specific: two strains of the same species can produce entirely different outcomes. ISAPP also clarified that phrases like "contains live cultures" are not equivalent to "probiotic" when clinical evidence is absent.
In subsequent years, the association issued parallel consensus statements on prebiotics (2017), synbiotics (2020), and postbiotics (2021), cementing its role as the field's terminological authority. For consumers, choosing products that state the exact strain and CFU dose — the ISAPP standard — is the most reliable way to separate science from marketing.
Scientific sources
- Nature — Hill et al. (2014) ISAPP consensus statement on the scope and appropriate use of the term probiotic — Nat Rev Gastroenterol Hepatol
- Source — ISAPP — official consensus statement resource page (probiotic definition)
- Nature — Gibson et al. (2017) ISAPP consensus statement on the definition and scope of prebiotics — Nat Rev Gastroenterol Hepatol
- Nature — Salminen et al. (2021) ISAPP consensus statement on the definition and scope of postbiotics — Nat Rev Gastroenterol Hepatol
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