YES! We have been brewing our own for over 25 years. First with goats milk, now with A2 milk. Kefir has way way more good bacteria strains then yogurt. Best info on www.kefir.net. Old site!
I made kefir for a while but not very successfully. Got grains from a friend who makes it. Went back to making yogurt which is easier. I kind of do the best I can, which is not always the best...