You may find it interesting to know that most people who suffer from B vitamin deficiencies are meat eaters.
It's a myth about the vitamin b deficiency in relation to the vegetarian/vegan diets. B12 does not come from animal protein - it's a bacteria found in plants contaminated by it.
I wouldn't say that plants are "contaminated by it" in the same sense that tobacco leaves are contaminated by RADIOACTIVE POLONIUM AND LEAD IN THE SOIL. The bacteria that we are referring to are there for a reason. The reason that is true is because (as far as we can tell) a vegetarian or vegan eater (especially Low-Fat-Raw-Vegan) has a much lower requirement for all nutrients in general because of lower energy levels required for digesting food and eliminating waste from the body (of which there is a lot of in meat - remember the waste that are still held up in cells about to be eliminated and still in interstitial fluids on the way out to the bloodstream at the time of death - as if I were a coroner describing some things evident after death of a person).
Now, a way to maintain that level of B12 is to simply rinse off utensils, plates, etc. without soap (unless grease is involved - then you HAVE to wash that stuff off), and don't wash your water bottle that you regularly drink out of. I usually wash my bottle with soap about every two months or so, as not washing it frequently builds up bacteria around the mouth opening, and I wash it when it becomes visually evident. This is why I always carry a second bottle of water with me when I go to work or on a trip. That way, if something happens on the way, and someone needs emergency water, it comes out of the clean bottle, never my active bottle. I don't want to mix up someone else's bacterial culture with mine.
The point is, you need to have bacteria in your system, because they not only make the B12 and other nutrients, but also serve to help break down your food and waste products in the body. What happens is when conditions go out of control in the body through improper lifestyle habits, and bacteria with poisonous excreta (their "doodoo" or metabolic waste as part of their live cycle) grow in colonies sufficiently large for its waste to become a bit much for the body to handle. These bacteria are always present in the body, but if you eat properly, they are kept in check by others and by a biological condition of the body that doesn't favor or support large colonies. With these colonies kept in control, the amount of poisonous excreta is really kept down to tolerable levels that don't make you sick (and you don't even notice that they're there - you're not supposed to notice under the right conditions).
On that same page I pointed you to, scroll down to Lesson 9 and look for Article #8, Factors that lower vitamin needs by TC Fry.
http://www.rawfoodexplained.com/sitemap.html It points out that our nutritionally-deficient and stressful lifestyles increases the expenditure rate of vitamin usage while at the same time giving us LESS of it. That is a FAST way to age your body. (age is merely a chronological indicator of damage to the body)