B-12 is found in animal foods, it is not manufactured by animal cells. It must be absorbed from their food by most animals, as it must be by humans. All Bl2 is made by bacteria. Ruminants, such as cows, do quite well, because bacteria in an accessory stomach, or rumen, produce Bl2 as they break down the fibre of the animal's food. But bacteria aren't just in cows' stomachs; they're practically everywhere. Researchers studying B12 have complained that it is necessary to carefully clean all instruments to get meaningful measurements of Bl2 -since even tap water can contain substantial amounts. ("Substantial amounts" in the sense that they can approach the range of what is needed in the human diet.) ..
So, I guess, possibly we can get particular B-12 bacterias from river water, under ground water, well water, stream water....if it is not filtered and consumed directly from its source., organic fruit/vegetable ( eaten without washing them), foods eaten without washing hands...and so on..and this kind of situation is quite normal in India.
I'm pretty relaxed now. I should give up acqua guard water, and start drinking boring water. Acquar guard kills good bacterias in the water. Boring water is safe to drink directly. And when we get chance to drink water from stream/water falls we should not avoid the opportunity.
Manish Jain
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