How are Kefir Grains different to powder starter (such as Body Ecology's products) or store-bought kefir?

Genuine kefir is different than the pricey kefir you can buy in the stores. Manufactured kefir is a simulated drink, mimicking the flavor of genuine kefir. It is not produced by the traditional method.

It is produced instead by a variety of bacteria and yeast (that they purchase individually) and combine. These are typically freeze-dried powder forms of bacteria and yeast, and like the Body Ecology products, are not reproducible. Traditional Kefir Grains are a formed symbiotic mass colony of various bacteria and yeast that are living, and will thrive and grow on their own in the milk, sometimes out-living its owner!

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