I haven't seen B. fragilis in any OTC probiotic supplement, but wouldn't hurt to check the label. Typically manufacturers choose strains which are well-studied

I haven't seen B. fragilis in any OTC probiotic supplement, but wouldn't hurt to check the label. Typically manufacturers choose strains which are well-studied enough to be blameless, if not necessarily magically good for you (to avoid liability, the cynic in me says...)