Yes I agree that the body is it's own doctor and knows how to heal most things itself, given a chance. But no organism lives, or could live, in a vacuum. Nature itself is a kind of interdependent organism. We are surrounded by plants and bacteria that promote our good health. Animals in a state of unhealth will often be seen to seek out certain grasses or herbs they need to heal.
Re. the original question I asked, in an age of possibly lethal flu pandemics if there is potential life-saving power in a side-effect-free substance like vitamin b12, organic or not, I want to know about it.