There don't seem to be any hard and fast rules- we are all so individual in our reactions to, and benefits from, probiotics. But generally the stuff in drugstores are low-potency junk, mostly just filler. There are of course many higher quality probiotic brands off the top of my head including for example: Garden of Life Primal Defense; Customprobiotics.com; Nature's Way; Trenev; Pro-bio; Culturelle; and VSL-3. Currently for example I use Primal defense, Pure Encapsulations brand Sachoromyces Boulardi, Nature's Way Reuteri, Pro-bio inulin free, and Culturelle, mixing and rotating them around from day to day. But you kind of have to do a bit of trial and error. SCD yogurt is terrific if you can tolerate it, as Kiss520 pointed out.
Pancolitis 20 years ago, full med-free remission 10 years,
Flaring/simmering on and off ever since
10 20 17.5 15 12.5 10 mg 8 7.5 20 mg pred, 100 mg Imuran
Probiotics (Primal Defense and others), TSO,
Turmeric/circumin, boswellia, fish oil, many vits/minerals
Lower-carb version of Specific Carb Diet (SCD), Remicade next