I used probiotics for 60 days and didn't help in my BO problem.
According to my Naturopath and my own research, I have Candidiasis.
In this case, I first need to kill the candida, and probably after that Probiotics will work. I don't now yet.
If you have intestinal bacteria ( like H pylori) or yeast ( candida) or other parasites, like my case, probiotics won't help, you first need to get rid of these problems, and then for recovery take probiotics.