B12 question for all you vitamin experts!

Brian, I appreciate your help. Perhaps we can get "B12 or Die" t-shirts in the vein of P Diddy's Vote or Die shirts from 04! In all seriousness, though, thanks for pointing out the gravity of this issue. I know I will need to supplement B12 after surgery, but I didn't know how much I should be taking with "normal" digestion. Thanks to you all, I get it now... I need to take the dang vitamins, and not  worry about overdoing it. Thanks again! Meghan