Kefir is made from gelatinous white or yellow particles called “grains". These grains contain the bacteria/yeast mixture clumped together with casein (milk proteins) and complex sugars. They look like pieces of coral or small clumps of cauliflower and range from the size of a grain of wheat to that of a hazelnut. ..
Kefir milk is a popular drink prepared by fermenting milk with live kefir grains. It contains beneficial yeast as well as friendly ‘probiotic’ bacteria.
For the lactose intolerant, kefir’s abundance of beneficial yeast and bacteria provide lactase, an enzyme which consumes most of the lactose left after the culturing process.