For years my blood tests have come back showing very excessive B12 levels in my blood. When the tests were taken I was a vegetarian and I wasn't taking any vit B12 supplements. I only found out about this recently. Apparently my tests have shown this for a very long time, but nobody's mentioned it to me because they're only concerned if your levels are too low... In fact one GP said "with vitamin B12, the higher the better".
However, if you google "excess vitamin B12 in the blood" you get a whole load of worrying suggestions, like liver or kidney disease and a long list of leukaemias and cancers. The GP assured me that I don't have any of these things, as my kidney and liver function tests all come out fine and so do my white blood cell counts. Of course this doesn't stop me from being worried and I'm not convinced that blood counts tell you the whole story about these things.
I'm going to pursue it further, because I tend to have a lot of symptoms that you get with vit. B12 deficiency, despite my high numbers, (indicating that even though B12 is circulating in my blood it's not being taken up and used correctly by the cells in my body??)
Does anybody else have really high levels of B12 in their blood? Could this somehow be related to Parksinson's?