I got lucky and the first kind I used worked well for me (I think it was suggested by my girlfriend at the time as a good brand, she had done a bunch of researc

I got lucky and the first kind I used worked well for me (I think it was suggested by my girlfriend at the time as a good brand, she had done a bunch of research about that kind of thing). I later tried several different others and they didn't seem to benefit me as much though some of them were at least somewhat beneficial. My impression is that there isn't a very good way currently of knowing ahead of time what if any probiotics might work well for any particular person.