Kefir is believed to have originated in the Caucasus Mountain region of Eastern Europe where the local people would ferment milk using grain-like colonies of both bacteria and yeast. These symbiotic colonies are known as "Kefir Grains.' The people in that region viewed kefir as a medicinal food and believed it could enhance well-being and longevity. Family Farmstead Dairy "slow-cultures" their kefir at low temperatures for longer periods of time to bring the flavor to life! They believe the pairing of real kefir grains with their milk containing only A2 proteins delivers one of the most powerful probiotic drinks on the shelf. Taste the difference!