“In order to maintain meat a source of B12 the meat industry now adds it to animal feed; 90 percent of B12 supplements produced in the world are fed to livestock. Even if you only eat grass fed organic meat you may not be able to absorb the B12 attached to animal protein. It may be more efficient to just skip the animals and get B12 directly from supplements.”
This vitamin works closely with folate to manufacture red blood cells and produces S-adenosylmethionine (SAM-e), involved in immune function and mood. Vitamin B12 is important for maintaining your central nervous system, including protection of the myelin sheath to shield and insulate the nerves.