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Сообщение от Annora

Нет, это не так. Buttermilk - не кефир. Посмотрите хотя бы в Wikepedia и kefir.net:

Artificially made buttermilk, also known as cultured buttermilk, is a product where lactic acid bacteria called Streptococcus lactis have been added to milk. So-called "Bulgarian buttermilk" is created with a different strain of bacteria called Lactobacillus bulgaricus which creates more tartness.

Kefir is made from gelatinous white or yellow particles called "grains." This makes kefir unique, as no other milk culture forms grains. These grains contain the bacteria/yeast mixture clumped together with casein (milk proteins) and complex sugars. Kefir contains several major strains of friendly bacteria not commonly found in yogurt, Lactobacillus Caucasus, Leuconostoc, Acetobacter species, and Streptococcus species.

понял, там разные культуры