This question comes up now and then.

The "range" is only an average made statistically years ago by selecting people who seem healthy and taking readings. So there are going to be people who are at the top end of that range.

That is why the low end is so low too.

1300 is not that high.

There are rare conditions that may elevate B12.
Some people with kidney disease cannot excrete it, so it reads higher than average.

Some Liver disease.
Some bacterial dysbiosis in the colon. (bacteria synthesize B12)
This link gives some of the less common and alarming causes:
http://www.sciencedirect.com/science...2&searchtype=a

Some foods and flours are fortified now... and B12 might be in them. Some breakfast cereals as well. B12 is in multivitamins.
Some liquid foods like SlimFast, Boost and Ensure have B12 in them. Some nutrition bars, etc. People with intact and well functioning intrinsic factor would absorb the small amounts in fortified foods easily.

There are no real studies showing any negative effects from high B12. Other than being a marker for some uncommon disease, it is considered benign. Therefore there is no upper limit set for this vitamin intake.

Also it is possible the lab is in error. Sometimes they do not calibrate their instruments properly. An example of this was a year long error at Quest regarding Vit D3. So don't assume this result is 100% accurate.
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