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Is biologically active B-12 produced by intestinal bacteria?

April 26, 2017active B-12 bacteria biologically Intestinal nutrition produced vitamin b-12 vitamin b12 vitamins

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Is biologically active B-12 produced by intestinal bacteria?

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[1980] is sometimes cited as evidence that B-12 producing bacteria can exist in the small intestine. Sometimes explicit claims are made, e.g., that intestinal bacteria allegedly can produce adequate B-12.