Last year my B12 was low and following a 2nd set of blood tests I was told that this had raised to within the normal range and to start taking multivitamins with B12. I have recently had another blood test done, as I always seem to be tired and suffering from migraines. I have been taken off HRT (I started quite young at 36) and migraines have improved, however I am still extremely tired. My blood test showed that I was within the low range of normal and a 2nd test 4 weeks following coming off HRT remains the same (180). If my count has been on the low side of normal (I understand the range is 170 to 900), do you think I would be entitled to ask for a therapeutic trial of B12 injections? This is affecting my ability to work (I couldn t save a couple of files on Tuesday) and had to take yesterday off work as I was totally exhausted.