The freeze dried “Kefir” aren’t really Kefir grains. It’s just freeze dried bacterial cultures.

Live Kefir grains have many more strains of bacteria, in addition to yeast and fungi, living in a symbiosis inside of a exoskeleton we call the Kefir grain.

I recommend getting some from Poseymom. They have been around for quite a while and their grains are authentic. I bought mine off Amazon years ago and they are still healthy and productive.