Posted Monday, April 23, 2012 at 11:13 AM
Great question. Maybe this will help clear it up:
B12 is made by neither animals nor plants; it is made by bacteria. Presumably, before the advent of modern hygiene, the bacteria in the soil and on plants provided traces of B12.
More here: http://www.pcrm.org/search/?cid=225
I like to remind people that many of our foods are fortified and supplemented with nutrients that are grossly lacking in the standard American diet. That includes an array of B vitamins readily available in plants yet which meat eaters are generally not getting enough (folate, thiamin, riboflavin, etc.).
Susan Levin, MS, RD
PCRM Director of Nutrition Education