Royal Canin Probiotics have included Saccharomyces boulardii CNCM I-1079
yeast strain. Yeast is less susceptible to antibiotics, which is a key
differentiator from bacteria-based probiotics.
Source: 4. Neut C, Mahieux S, Dubreuil LJ. Antibiotic susceptibility
of probiotic strains: Is it reasonable to combine probiotics with
antibiotics? Med Mal Infect. 2017 Nov;47(7):477-483