Vitamin B-12 Level High While Taking Supplements
My fathers B-12 was low back in Seotember 2015 and his caretaker started supplementing 5000 mcg daily. The doctors never did a follow up until I requested one, which was drawn 3 days ago (1-18-16).
The result was 1862 - way over the normal range of 211 -911. In reading about the possible side effects of too much B-12, I found a side effect listed that stood apart from the rest, which had to do with increasing certain cancers... specifically Prostate Cancer, which he has!!!
My question to you is.... what dosage is a safe dosage and for how long? I do not want his B-12 to get low again because he gets depressed and he also has mild Dementia. At the same time, I don't want it to get so high that it could be exascerbating the Prostate Cancer, which at 89 years old he has decided not to treat.