A personal trial using VSL 3 for 30 days revealed the emergence of new bacterial strains.

“I did a personal trial myself where I took VSL 3 for 30 days, and I measured... Well, I I didn't specifically measure it, I used Ubiome, a company allows you to send in a little sample of your poop and they'll tell you what sort of bacteria are in it. So I did this before and after 30 days of VSL 3. I was very interested to see that I was expecting just to have an increase in some of this commensal bacteria that were in the probiotic, but what I found to my surprise was that I have new strains of bacteria that weren't identified previously cropping up.”