I've been suffering with a list of symptoms as long as my arm that the doctors haven't diagnosed a cause for so I had a hair sample test and it highlighted a b12 deficiency. Without looking into the problem I decided to supplement with 1000mcg lozenges daily for about a week to see if it worked and I immediately felt my symptoms improve. The remarkable response to supplementing made me look further into the subject and I now realise how severe the impact of b12 deficiency can be - I read the book "Could it be B12" and was shocked to see all of my symptoms staring back at me from the pages!
My doctor agreed a b12 test but he said that because I have supplemented for a week already I'd have to wait a month to do the test. Is this the case? I can't find any information on how long it takes for b12 to leave the system anywhere and I'd like to get the test and get back on it since I am beginning to feel unwell again since stopping.