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Would that be from water, soil, plants, funguses,...?

I asked the question in Quora but that, at the time of posting in this forum, haven't been very helpful. I also have searched for the information, but I haven't been able to find it. In Vegan Health it says that

"The vitamin B12 component in B12 supplements and fortified foods is made by bacteria and sourced from bacteria cultures; it is not taken from animal products"

But I wonder where did those cultures come from. One day someone had to collect the bacteria from somewhere in order to start the cultures.

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migrated from chemistry.stackexchange.com Dec 23 '17 at 21:24

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    $\begingroup$ What exactly are you asking? The geographical location from which the bacteria were originally obtained from? $\endgroup$ – canadianer Dec 24 '17 at 1:55
  • $\begingroup$ @canadianer I'm asking what medium is the bacteria used to synthesize B12 sourced from -water, animal intestines, plants, soil, feces. $\endgroup$ – freethinker36 Dec 24 '17 at 5:57

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