Milk Kefir (pronounced keh-FEER) is a wonderfully delicious slightly carbonated fermented milk beverage similar to yogurt (or buttermilk). It originated roughly 2,000 years ago in the Caucasus Mountains between Europe and Russia, making kefir one of the oldest milk ferments in existence.
Authentic kefir can only be made by real kefir grains, not from any kind of packet or powder. Kefir available at the stores are poor imitations. Real kefir can only be made at home.
Kefir is simply milk that is fermented at room temperature with kefir grains for about 24 hours. It has many wonderful health benefits, a great flavor and is also tolerated well by the lactose intolerant. It's much easier to make than yogurt, has a larger spectrum of probiotics and the sustainable grains make it more economical.