Probiotics are typically various strains of lactobacillus. Although E. coli and B. fragilis are “commensal flora,” they can be extraordinarily pathogenic. I do

Probiotics are typically various strains of lactobacillus. Although E. coli and B. fragilis are “commensal flora,” they can be extraordinarily pathogenic. I don’t think any company wants to take on the liability of feeding you a bacteria with a ~20% mortality rate (the BF) and trying to ensure their cultures never get contaminated with a more toxogenic strain -and- that no one takes it the wrong way (oh, did you bite that capsule open and get the B. fragilis into your peptic ulcer...?).