I have been researching the Specific Carb Diet by E. Gottschall and HSO's are on the list of ILLEGAL items. That's all I know though. I am not testimonialing(that can't be a real word). I take a lactobacillus blend only to try and help my Crohn's disease. I don't know if I have IBS because the CD is so predominant I couldn't tell the difference I think.