It is normally involved in the metabolism of every cell of the human body, especially affecting DNA synthesis and regulation, <a href="http://en.wikipedia.org/wiki/Vitamin_B12...Vitamin">http://en.wikipedia.org/wiki/Vitamin_B12...Vitamin</a> B12 is found in most animal derived foods,...Besides certain fermented foods,[71][72] there are currently only a few non-animal food sources of biologically active B12 suggested,[citation needed] and none of these have been