I'm curious if anyone has had any personal experience with elevated B12 readings from taking multivitamin supplementation (fortified with B12). I had some bloodwork results come back and my vitamin B12 readings were around 1500 (normal lab values: 200-1000). I had bloodwork done several months ago and my B12 readings were within range so I'm concerned that something is wrong. Liver/kidney function checks out fine. The only thing that has changed between the two tests is I started taking a multivitamin that has 135 mcg of VitB12. Is this enough of an amount of B12 to cause an elevated B12 reading to be that high?? Should I see a hematologist to rule out any other underlying diseases? I know there is nothing wrong with high B12 levels but everything I read about it shows that it is usually a symptom of an underlying disease (liver,leukemia,etc).