[Addye]

I'm new here (although longtime lurker) so sorry in advance if this isn't clear, in the proper place, etc.! I got some bloodwork done recently to check on iron levels (I have chronically low ferritin and take prescription iron), and they decided to test B12 while they were at it. I've always been smack dab in the normal range, but now I'm at nearly 1,000? I probably consume foods fortified with B12 (e.g. fortified cereals, nutritional yeast), but not consciously and not in large amounts. I take a B Complex supplement but probably remember to take it at most once per week, sometimes less, and have always supplemented this amount or more. It's not terribly above normal so I'm not sure it's worth making an appointment over, but I'm just very confused as to how this is even possible?
Does anybody have similar experiences/ideas of what is going on here? I have the full results if that's at all helpful, but honestly I really don't think it's something to be worried about so much as an interesting thing.
Thanks in advance

 

[rose10]

http://www.livestrong.com/article/300753-what-are-the-causes-of-high-blood-levels-of-vitamin-b12/

Maybe the article will be useful for you. Actually, I don't have any similar experiences as you.

 

[David3]

I'm new here (although longtime lurker) so sorry in advance if this isn't clear, in the proper place, etc.! I got some bloodwork done recently to check on iron levels (I have chronically low ferritin and take prescription iron), and they decided to test B12 while they were at it. I've always been smack dab in the normal range, but now I'm at nearly 1,000? I probably consume foods fortified with B12 (e.g. fortified cereals, nutritional yeast), but not consciously and not in large amounts. I take a B Complex supplement but probably remember to take it at most once per week, sometimes less, and have always supplemented this amount or more. It's not terribly above normal so I'm not sure it's worth making an appointment over, but I'm just very confused as to how this is even possible?
Does anybody have similar experiences/ideas of what is going on here? I have the full results if that's at all helpful, but honestly I really don't think it's something to be worried about so much as an interesting thing.
Thanks in advance

As Rose's article says, even very high intakes of vitamin B12 are not usually considered toxic. Mainstream health agencies say the same thing: https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/#h8

However, high blood levels of vitamin B12 can be a sign of a serious medical problem. It's not that the high B12 intake is causing the problem. Rather, the opposite can be true: The medical problem may be causing the elevated B12 levels: https://www.ncbi.nlm.nih.gov/pubmed/14636871

If your physician wasn't concerned, then it may not be anything to worry about. You could specifically discuss it with them, just to be on the safe side.
.