Y'all may know this, but each yogurt or kefir product has their own selection and formulation of probiotic (bacterial) strains. No two competing products have the same strains, number of strains, or amounts of probiotic microbes.
I've talked to some researchers that have expressed concerns that some of the bugs may not be beneficial, even dangerous, but I've not had the time to do any follow-up research.
In the meantime, I use kefir everyday on my morning cereal and like it very much!
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