2026 Feb 17;117(1):32
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unlike many bacteria, these yeasts demonstrate high survival rates through the GI tract and can assist in stabilizing microbial balance and modulating immunity during infections or chronic illnesses ( Probiotic efficacy is generally measured in colony-forming units (CFU), with typical daily doses ranging from 1 10 9 to 1 10 0 CFU, though clinical benefits are highly dependent on the specific strain or combination of strains, as many effectssuch as the prevention of diarrheal diseasesare strictly strain-specific ( Concurrently, accumulating evidence suggests that several core mechanisms, namely, pathogen inhibition, enhancement of epithelial barrier function, and immunomodulation, are common across multiple taxa, providing a mechanistic foundation for the extensive commercialization of probiotics in dietary supplements, functional foods and beverages, and topical cosmetic formulations worldwide ( 3 Key probiotic microorganisms and their functional characteristics Key probiotic microorganisms in the gut are typically Gram-positive or yeast species that can survive GI transit, transiently colonize the intestine, and interact with the resident microbiota and host tissues ( Figure 1 illustrates the pathway from the isolation of probiotic strains to industrial-scale production
