Matia had me try kefir at one point last year.  It was great for my bowels, I tend to be loose, but it flared my bladder.  It is worth a try if you can tolerate it.

I just asked her this week. I am sure it is totally different for each person but for me she said not right now. I am a new patient though- you might be ready for it.

She once recommended the Helios brand for me...plain of course.  I love it.

Don't try a food --esp like kefir which can act like the probiotics!-- without first checking w/ Matia.  Sometimes she uses it as part of somebody's actual protocol, which shows its potential potency!  When she tried it in my protocol it aggravated me a lot.  I remember there was some other food a while back... I thought it was totally innocuous.... but not only was it not ok for me to try it then, it also had properties of several strong herbs (I had no idea), and that aggravated me too.  So just be careful.