From http://tuberose.com/Vitamins.html
Unfortunately, the site doesn't list any sources.... too bad, because I've heard about B12 production in the mouth for several years, but haven't seen any real documentation.A further source of B12 is bacterial growth in the mouth (around the teeth and gums), in the nasopharynx, around the tonsils and tonsillar crypts, in the folds at the base of the tongue, and in the upper bronchial tree. Up to 0.5 micorograms daily can be obtained from this source. It's likely that this source alone will supply sufficient quantities of B12 for the small requirement that a pure vegetarian has, especially considering his low protein intake, which further reduces the need for B12.
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