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I do have a B12 deficiency and learned a little about it. Something the article does not state (unless I missed it, which is entirely possible) is that a person needs something called "intrinsic factor" in your stomach. This aids in the absorption of B12 and without it, a person can swallow as much of raw liver, red meat or take the vitamins orally as they can and it won't do any good. Intrinsic factor is aptly named. It is intrinsic for the absorption of B12.

Many older people have exhausted their natural sources of intrinsic factor and so they cannot meet their B12 needs through diet. GET THE SHOTS! It makes a world of difference.

I can tell when I go too long between injections. I get more light-headed, I develop a peculiar type of a headache, and the ringing in my ears is deafening! Further, it is very difficult to take too much of B12. It is water soluable. What you don't use, you excrete. HTH.