I was reading the article last night by Kevin Byrne on the Enterohepatic Circulation. I've read it a lot - Kevin has a medical background, I haven't, and I really have to work through what he puts (it's brilliant by the way)
But he was talking about getting treatment and I'm not going to quote him directly but his analogy was relating to osteoporosis.
What he said in effect was that if you were diagnosed with osteoporosis and your calcium levels were low, would a doctor consider you treated ie the osteoporosis reversed, after they had given you treatment which pushed your calcium levels into normal?
Because that is exactly what they do with b12 deficiency patients.
Mind you we now know that they were doing that because doctors thought b12 was a blood condition first and a neurological condition last. Bit of an error, that one.