In 1908, Metchnikov wrote in the book “The extension of life” how the secret of longevity based in the Russian Caucasus Mountains was Kefir. Kefir is in fact cultured milk that people made and consumed. The villagers of the Caucasus Mountains gave us the Caucasian yoghurt and kefir (milk fermentation product). Kefir history goes back several centuries. It is reputed