It is interesting that B12 in sufficient quantities is actually made by bacteria in the gut, but as it is not absorbed there (only small intestine can absorb th

It is interesting that B12 in sufficient quantities is actually made by bacteria in the gut, but as it is not absorbed there (only small intestine can absorb that) it became a waste. It is probably one of the reasons that animals like dogs or gorillas eat their feces. [1] http://www.veganhealth.org/b12/animal http://www.veganhealth.org/b12/animal